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2018-05-18perf script: Show symbol offsets by defaultSandipan Das2-18/+20
Since the ip shown for a symbol is now always a virtual address, it becomes difficult to correlate this with objdump output and determine the exact instruction address. So, we always show the offset from the start of the symbol. This can be verified on a powerpc64le system running Fedora 27 as follows: # perf probe -a sys_write # perf record -e probe:sys_write -g ~/test Before applying this patch: # perf script test 9710 [013] 95614.332431: probe:sys_write: (c0000000004025b0) c0000000004025b0 sys_write (/lib/modules/4.17.0-rc4+/build/vmlinux) c00000000000b9e0 system_call (/lib/modules/4.17.0-rc4+/build/vmlinux) 7fffb70d8234 __GI___libc_write (/usr/lib64/libc-2.26.so) 7fffb7052c74 _IO_file_write@@GLIBC_2.17 (/usr/lib64/libc-2.26.so) 5afc1818 [unknown] ([unknown]) 7fffb7051a60 new_do_write (/usr/lib64/libc-2.26.so) 7fffb7054638 _IO_do_write@@GLIBC_2.17 (/usr/lib64/libc-2.26.so) 7fffb7054bbc _IO_file_overflow@@GLIBC_2.17 (/usr/lib64/libc-2.26.so) 7fffb7055a24 __overflow (/usr/lib64/libc-2.26.so) 7fffb7044548 _IO_puts (/usr/lib64/libc-2.26.so) 10000440 main (/home/sandipan/test) 7fffb6fe36a0 generic_start_main.isra.0 (/usr/lib64/libc-2.26.so) 7fffb6fe3898 __libc_start_main (/usr/lib64/libc-2.26.so) 0 [unknown] ([unknown]) ... After applying this patch: # perf script test 9710 [013] 95614.332431: probe:sys_write: (c0000000004025b0) c0000000004025b0 sys_write+0x10 (/lib/modules/4.17.0-rc4+/build/vmlinux) c00000000000b9e0 system_call+0x58 (/lib/modules/4.17.0-rc4+/build/vmlinux) 7fffb70d8234 __GI___libc_write+0x24 (/usr/lib64/libc-2.26.so) 7fffb7052c74 _IO_file_write@@GLIBC_2.17+0x44 (/usr/lib64/libc-2.26.so) 5afc1818 [unknown] ([unknown]) 7fffb7051a60 new_do_write+0x90 (/usr/lib64/libc-2.26.so) 7fffb7054638 _IO_do_write@@GLIBC_2.17+0x38 (/usr/lib64/libc-2.26.so) 7fffb7054bbc _IO_file_overflow@@GLIBC_2.17+0x14c (/usr/lib64/libc-2.26.so) 7fffb7055a24 __overflow+0x64 (/usr/lib64/libc-2.26.so) 7fffb7044548 _IO_puts+0x218 (/usr/lib64/libc-2.26.so) 10000440 main+0x20 (/home/sandipan/test) 7fffb6fe36a0 generic_start_main.isra.0+0x140 (/usr/lib64/libc-2.26.so) 7fffb6fe3898 __libc_start_main+0xb8 (/usr/lib64/libc-2.26.so) 0 [unknown] ([unknown]) ... Signed-off-by: Sandipan Das <[email protected]> Tested-by: Arnaldo Carvalho de Melo <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Naveen N. Rao <[email protected]> Cc: Ravi Bangoria <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17selftests/bpf: check return value of fopen in test_verifier.cJesper Dangaard Brouer1-0/+5
Commit 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled") forgot to check return value of fopen. This caused some confusion, when running test_verifier (from tools/testing/selftests/bpf/) on an older kernel (< v4.4) as it will simply seqfault. This fix avoids the segfault and prints an error, but allow program to continue. Given the sysctl was introduced in 1be7f75d1668 ("bpf: enable non-root eBPF programs"), we know that the running kernel cannot support unpriv, thus continue with unpriv_disabled = true. Fixes: 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled") Signed-off-by: Jesper Dangaard Brouer <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
2018-05-17perf script: Show virtual addresses instead of offsetsSandipan Das1-1/+1
When perf data is recorded with the call-graph option enabled, the callchain shown by perf script shows the binary offsets of the symbols as the ip. This is incorrect for kernel symbols as the ip values are always off by a fixed offset depending on the architecture. If the offsets from the start of the symbols are printed, they are also incorrect for both kernel and userspace symbols. Without the call-graph option, the callchain shows the virtual addresses of the symbols rather than their binary offsets. The offsets printed in this case are also correct. This fixes the inconsistency in perf script's output. This can be verified on a powerpc64le system running Fedora 27 as follows: # cat /proc/kallsyms | grep sys_write ... c0000000004025a0 T sys_write c0000000004025a0 T __se_sys_write ... # perf probe -a sys_write Before applying this patch: # perf record -e probe:sys_write -g ~/test # perf script -F ip,sym,symoff 4125b0 sys_write+0x8000000000008010 1b9e0 system_call+0x8000000000008058 118234 __GI___libc_write+0xffff0000f52c0024 92c74 _IO_file_write@@GLIBC_2.17+0xffff0000f52c0044 5afbfd8a [unknown] 91a60 new_do_write+0xffff0000f52c0090 94638 _IO_do_write@@GLIBC_2.17+0xffff0000f52c0038 94bbc _IO_file_overflow@@GLIBC_2.17+0xffff0000f52c014c 95a24 __overflow+0xffff0000f52c0064 84548 _IO_puts+0xffff0000f52c0218 440 main+0xffffffffe0000020 236a0 generic_start_main.isra.0+0xffff0000f52c0140 23898 __libc_start_main+0xffff0000f52c00b8 0 [unknown] ... # perf record -e probe:sys_write ~/test # perf script -F ip,sym,symoff c0000000004025b0 sys_write+0x10 ... After applying this patch: # perf record -e probe:sys_write -g ~/test # perf script -F ip,sym,symoff c0000000004025b0 sys_write+0x10 c00000000000b9e0 system_call+0x58 7fffb70d8234 __GI___libc_write+0x24 7fffb7052c74 _IO_file_write@@GLIBC_2.17+0x44 5afc1818 [unknown] 7fffb7051a60 new_do_write+0x90 7fffb7054638 _IO_do_write@@GLIBC_2.17+0x38 7fffb7054bbc _IO_file_overflow@@GLIBC_2.17+0x14c 7fffb7055a24 __overflow+0x64 7fffb7044548 _IO_puts+0x218 10000440 main+0x20 7fffb6fe36a0 generic_start_main.isra.0+0x140 7fffb6fe3898 __libc_start_main+0xb8 0 [unknown] ... # perf record -e probe:sys_write ~/test # perf script -F ip,sym,symoff c0000000004025b0 sys_write+0x10 ... Signed-off-by: Sandipan Das <[email protected]> Tested-by: Arnaldo Carvalho de Melo <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Naveen N. Rao <[email protected]> Cc: Ravi Bangoria <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17perf tools: No need to unconditionally read the max_stack sysctlsArnaldo Carvalho de Melo6-10/+18
Let tools that need to have those variables with the sysctl current values use a function that will read them. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17perf tools: Read the cache line size lazilyArnaldo Carvalho de Melo5-17/+25
It is not read as commonly as 'page_size', so it makes sense to read it lazily, caching its value when it is first read. Less files open unconditionally at startup. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17tools include compiler-gcc: Add __pure attribute helperArnaldo Carvalho de Melo1-0/+3
Adopt it from the kernel sources, will be used soon. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17tools lib api fs tracing_path: Make tracing_events_path privateArnaldo Carvalho de Melo2-4/+1
Not anymore accessed outside this library, keep it private. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17tools lib api fs tracing_path: Introduce opendir() methodArnaldo Carvalho de Melo4-5/+21
That takes care of using the right call to get the tracing_path directory, the one that will end up calling tracing_path_set() to figure out where tracefs is mounted. One more step in doing just lazy reading of system structures to reduce the number of operations done unconditionaly at 'perf' start. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17perf parse-events: Use get/put_events_file()Arnaldo Carvalho de Melo3-22/+43
Instead of accessing the trace_events_path variable directly, that may not have been properly initialized wrt detecting where tracefs is mounted. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17perf tools: Reuse the path to the tracepoint /events/ directoryArnaldo Carvalho de Melo1-8/+7
When using for_each_event() we needlessly rebuild the whole path to the tracepoint directory, reuse the dir_path instead, saving some cycles and reducing the size of the next patch. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds5-20/+43
Pull kvm fixes from Paolo Bonzini: - ARM/ARM64 locking fixes - x86 fixes: PCID, UMIP, locking - improved support for recent Windows version that have a 2048 Hz APIC timer - rename KVM_HINTS_DEDICATED CPUID bit to KVM_HINTS_REALTIME - better behaved selftests * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock KVM: arm/arm64: VGIC/ITS: Promote irq_lock() in update_affinity KVM: arm/arm64: Properly protect VGIC locks from IRQs KVM: X86: Lower the default timer frequency limit to 200us KVM: vmx: update sec exec controls for UMIP iff emulating UMIP kvm: x86: Suppress CR3_PCID_INVD bit only when PCIDs are enabled KVM: selftests: exit with 0 status code when tests cannot be run KVM: hyperv: idr_find needs RCU protection x86: Delay skip of emulated hypercall instruction KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs
2018-05-17tools lib api fs tracing_path: Introduce get/put_events_file() helpersArnaldo Carvalho de Melo3-6/+25
To make reading events files a tad more compact than with get_tracing_files("events/foo"). Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-17tools/power/x86/intel_pstate_tracer: Add optional setting of trace buffer ↵Doug Smythies1-19/+35
memory allocation Allow the user to override the default trace buffer memory allocation by adding a command line option to override the default. The patch also: Adds a SIGINT (i.e. CTRL C exit) handler, so that things can be cleaned up before exit. Moves the postion of some other cleanup from after to before the potential "No valid data to plot" exit. Replaces all quit() calls with sys.exit, because quit() is not supposed to be used in scripts. Signed-off-by: Doug Smythies <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]>
2018-05-16tools lib api: Unexport 'tracing_path' variableArnaldo Carvalho de Melo4-9/+4
One should use tracing_path_mount() instead, so more things get done lazily instead of at every 'perf' tool call startup. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-16tools lib api: The tracing_mnt variable doesn't need to be globalArnaldo Carvalho de Melo1-3/+2
Its only used in the file it is defined, so just make it static. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-16perf config: Call perf_config__init() lazilyArnaldo Carvalho de Melo3-9/+9
We check what perf_config__init() does at each perf_config() call, namely if the static perf_config instance was created, so instead of bailing out in that case, try to allocate it, bailing if it fails. Now to get the perf_config() call out of the start of perf's main() function, doing it also lazily. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Taeung Song <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-16perf bpf: Fix NULL return handling in bpf__prepare_load()YueHaibing1-3/+3
bpf_object__open()/bpf_object__open_buffer can return error pointer or NULL, check the return values with IS_ERR_OR_NULL() in bpf__prepare_load and bpf__prepare_load_buffer Signed-off-by: YueHaibing <[email protected]> Acked-by: Daniel Borkmann <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-16perf parse-events: Handle uncore event aliases in small groups properlyKan Liang4-9/+137
Perf stat doesn't count the uncore event aliases from the same uncore block in a group, for example: perf stat -e '{unc_m_cas_count.all,unc_m_clockticks}' -a -I 1000 # time counts unit events 1.000447342 <not counted> unc_m_cas_count.all 1.000447342 <not counted> unc_m_clockticks 2.000740654 <not counted> unc_m_cas_count.all 2.000740654 <not counted> unc_m_clockticks The output is very misleading. It gives a wrong impression that the uncore event doesn't work. An uncore block could be composed by several PMUs. An uncore event alias is a joint name which means the same event runs on all PMUs of a block. Perf doesn't support mixed events from different PMUs in the same group. It is wrong to put uncore event aliases in a big group. The right way is to split the big group into multiple small groups which only include the events from the same PMU. Only uncore event aliases from the same uncore block should be specially handled here. It doesn't make sense to mix the uncore events with other uncore events from different blocks or even core events in a group. With the patch: # time counts unit events 1.001557653 140,833 unc_m_cas_count.all 1.001557653 1,330,231,332 unc_m_clockticks 2.002709483 85,007 unc_m_cas_count.all 2.002709483 1,429,494,563 unc_m_clockticks Reported-by: Andi Kleen <[email protected]> Signed-off-by: Kan Liang <[email protected]> Acked-by: Jiri Olsa <[email protected]> Cc: Agustin Vega-Frias <[email protected]> Cc: Ganapatrao Kulkarni <[email protected]> Cc: Jin Yao <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Shaokun Zhang <[email protected]> Cc: Will Deacon <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-16Merge branch 'for-mingo' of ↵Ingo Molnar6-127/+166
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu - Updates to the handling of expedited grace periods, perhaps most notably parallelizing their initialization. Other changes include fixes from Boqun Feng. - Miscellaneous fixes. These include an nvme fix from Nitzan Carmi that I am carrying because it depends on a new SRCU function cleanup_srcu_struct_quiesced(). This branch also includes fixes from Byungchul Park and Yury Norov. - Updates to reduce lock contention in the rcu_node combining tree. These are in preparation for the consolidation of RCU-bh, RCU-preempt, and RCU-sched into a single flavor, which was requested by Linus Torvalds in response to a security flaw whose root cause included confusion between the multiple flavors of RCU. - Torture-test updates that save their users some time and effort. Conflicts: drivers/nvme/host/core.c Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15torture: Make kvm-find-errors.sh find build warningsPaul E. McKenney1-2/+3
Currently, kvm-find-errors.sh looks only for build errors ("error:"), so this commit makes it also locate build warnings ("warning:"). Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Nicholas Piggin <[email protected]>
2018-05-15rcutorture: Abbreviate kvm.sh summary linesPaul E. McKenney1-2/+2
With the addition of the end-of-test state, it is not uncommon for the kvm.sh summary lines to overflow 80 characters. This commit therefore applies abbreviations in order to make the line fit into 80 characters with high probability. And yes, I did make heavy use of punched cards back in the day, so 80 columns it is for my xterms! ;-) Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Nicholas Piggin <[email protected]>
2018-05-15rcutorture: Print end-of-test state in kvm.sh summaryPaul E. McKenney1-2/+6
This commit adds the end-of-test test, if present in the console output, to the kvm.sh test summary that is printed by kvm-recheck.sh. Note that this only applies to rcutorture console output. Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Nicholas Piggin <[email protected]>
2018-05-15torture: Fold parse-torture.sh into parse-console.shPaul E. McKenney4-123/+102
The rcutorture scripting scans the console output twice, once to look for various sorts of hangs and again to find warnings and panics. Unfortunately, only the output of the second scan gets written to the console.log.diags file, which can cause hangs to be overlooked. This commit therefore folds the parse-torture.sh script (which looks for hangs) into the parse-console.sh script (which looks for warnings and panics). This allows both types of failure information to be added to console.log.diags, while still reliably removing this file when it proves to be empty. This also fixes a long-standing bug where rcuperf log files would unconditionally complain about a hang. Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Nicholas Piggin <[email protected]>
2018-05-15torture: Add a script to edit output from failed runsPaul E. McKenney1-0/+55
This commit adds a script that allows viewing the build and/or console output from failed rcutorture, locktorture, or rcuperf runs. This replaces a time-honored but inefficient manual procedure that uses cut and paste. Signed-off-by: Paul E. McKenney <[email protected]> Tested-by: Nicholas Piggin <[email protected]>
2018-05-15perf tools: Use the "_stest" symbol to identify the kernel map when loading ↵Adrian Hunter1-8/+8
kcore The first symbol is not necessarily in the kernel text. Instead of using the first symbol, use the _stest symbol to identify the kernel map when loading kcore. This allows for the introduction of symbols to identify the x86_64 PTI entry trampolines. Signed-off-by: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Dave Hansen <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf bpf: Add probe() helper to reduce kprobes boilerplateArnaldo Carvalho de Melo2-2/+11
So that kprobe definitions become: int probe(function, variables)(void *ctx, int err, var1, var2, ...) The existing 5sec.c, got converted and goes from: SEC("func=hrtimer_nanosleep rqtp->tv_sec") int func(void *ctx, int err, long sec) { } To: int probe(hrtimer_nanosleep, rqtp->tv_sec)(void *ctx, int err, long sec) { } If we decide to add tv_nsec as well, then it becomes: $ cat tools/perf/examples/bpf/5sec.c #include <bpf.h> int probe(hrtimer_nanosleep, rqtp->tv_sec rqtp->tv_nsec)(void *ctx, int err, long sec, long nsec) { return sec == 5; } license(GPL); $ And if we run it, system wide as before and run some 'sleep' with values for the tv_nsec field, we get: # perf trace --no-syscalls -e tools/perf/examples/bpf/5sec.c 0.000 perf_bpf_probe:hrtimer_nanosleep:(ffffffff9811b5f0) tv_sec=5 tv_nsec=100000000 9641.650 perf_bpf_probe:hrtimer_nanosleep:(ffffffff9811b5f0) tv_sec=5 tv_nsec=123450001 ^C# Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf bpf: Add license(NAME) helperArnaldo Carvalho de Melo3-4/+7
To further reduce boilerplate. Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf bpf: Add kprobe example to catch 5s napsArnaldo Carvalho de Melo1-0/+44
Description: . Disable strace like syscall tracing (--no-syscalls), or try tracing just some (-e *sleep). . Attach a filter function to a kernel function, returning when it should be considered, i.e. appear on the output: $ cat tools/perf/examples/bpf/5sec.c #include <bpf.h> SEC("func=hrtimer_nanosleep rqtp->tv_sec") int func(void *ctx, int err, long sec) { return sec == 5; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; $ . Run it system wide, so that any sleep of >= 5 seconds and < than 6 seconds gets caught. . Ask for callgraphs using DWARF info, so that userspace can be unwound . While this is running, run something like "sleep 5s". # perf trace --no-syscalls -e tools/perf/examples/bpf/5sec.c/call-graph=dwarf/ 0.000 perf_bpf_probe:func:(ffffffff9811b5f0) tv_sec=5 hrtimer_nanosleep ([kernel.kallsyms]) __x64_sys_nanosleep ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64 ([kernel.kallsyms]) __GI___nanosleep (/usr/lib64/libc-2.26.so) rpl_nanosleep (/usr/bin/sleep) xnanosleep (/usr/bin/sleep) main (/usr/bin/sleep) __libc_start_main (/usr/lib64/libc-2.26.so) _start (/usr/bin/sleep) ^C# Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf bpf: Add bpf.h to be used in eBPF proggiesArnaldo Carvalho de Melo3-2/+10
So, the first helper is the one shortening a variable/function section attribute, from, for instance: char _license[] __attribute__((section("license"), used)) = "GPL"; to: char _license[] SEC("license") = "GPL"; Convert empty.c to that and it becomes: # cat ~acme/lib/examples/perf/bpf/empty.c #include <bpf.h> char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; # Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf bpf: Add 'examples' directoriesArnaldo Carvalho de Melo3-0/+12
The first one is the bare minimum that bpf infrastructure accepts before it expects actual events to be set up: $ cat tools/perf/examples/bpf/empty.c char _license[] __attribute__((section("license"), used)) = "GPL"; int _version __attribute__((section("version"), used)) = LINUX_VERSION_CODE; $ If you remove that "version" line, then it will be refused with: # perf trace -e tools/perf/examples/bpf/empty.c event syntax error: 'tools/perf/examples/bpf/empty.c' \___ Failed to load tools/perf/examples/bpf/empty.c from source: 'version' section incorrect or lost (add -v to see detail) Run 'perf list' for a list of valid events Usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] -e, --event <event> event/syscall selector. use 'perf list' to list available events # The next ones will, step by step, show simple filters, then the needs for headers will be made clear, it will be put in place and tested with new examples, rinse, repeat. Back to using this first one to test the perf+bpf infrastructure: If we run it will fail, as no functions are present connecting with, say, a tracepoint or a function using the kprobes or uprobes infrastructure: # perf trace -e tools/perf/examples/bpf/empty.c WARNING: event parser found nothing invalid or unsupported event: 'tools/perf/examples/bpf/empty.c' Run 'perf list' for a list of valid events Usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] -e, --event <event> event/syscall selector. use 'perf list' to list available events # But, if we set things up to dump the generated object file to a file, and do this after having run 'make install', still on the developer's $HOME directory: # cat ~/.perfconfig [llvm] dump-obj = true # # perf trace -e ~acme/lib/examples/perf/bpf/empty.c LLVM: dumping /home/acme/lib/examples/perf/bpf/empty.o WARNING: event parser found nothing invalid or unsupported event: '/home/acme/lib/examples/perf/bpf/empty.c' <SNIP> # We can look at the dumped object file: # ls -la ~acme/lib/examples/perf/bpf/empty.o -rw-r--r--. 1 root root 576 May 4 12:10 /home/acme/lib/examples/perf/bpf/empty.o # file ~acme/lib/examples/perf/bpf/empty.o /home/acme/lib/examples/perf/bpf/empty.o: ELF 64-bit LSB relocatable, *unknown arch 0xf7* version 1 (SYSV), not stripped # readelf -sw ~acme/lib/examples/perf/bpf/empty.o Symbol table '.symtab' contains 3 entries: Num: Value Size Type Bind Vis Ndx Name 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 1: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 3 _license 2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 4 _version # # tools/bpf/bpftool/bpftool --pretty ~acme/lib/examples/perf/bpf/empty.o null # Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf llvm-utils: Add bpf include path to clang command lineArnaldo Carvalho de Melo4-5/+27
We'll start putting headers for helpers to be used in eBPF proggies in there: # perf trace -v --no-syscalls -e empty.c |& grep "llvm compiling command : " llvm compiling command : /usr/lib64/ccache/clang -D__KERNEL__ -D__NR_CPUS__=4 -DLINUX_VERSION_CODE=0x41100 -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/7/include -I/home/acme/git/linux/arch/x86/include -I./arch/x86/include/generated -I/home/acme/git/linux/include -I./include -I/home/acme/git/linux/arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I/home/acme/git/linux/include/uapi -I./include/generated/uapi -include /home/acme/git/linux/include/linux/kconfig.h -I/home/acme/lib/include/perf/bpf -Wno-unused-value -Wno-pointer-sign -working-directory /lib/modules/4.17.0-rc3-00034-gf4ef6a438cee/build -c /home/acme/bpf/empty.c -target bpf -O2 -o - # Notice the "-I/home/acme/lib/include/perf/bpf" Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf buildid-cache: Warn --purge-all failuresRavi Bangoria1-2/+6
Warn perf buildid-cache --purge-all failures in non verbose mode. Ex.: $ sudo chown root:root /home/ravi/.debug -R $ sudo chmod 700 /home/ravi/.debug/ -R $ ./perf buildid-cache -P Couldn't remove some caches. Error: Permission denied. Suggested-by: Masami Hiramatsu <[email protected]> Signed-off-by: Ravi Bangoria <[email protected]> Acked-by: Masami Hiramatsu <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15perf tests parse-events: Add intel_pt parse testArnaldo Carvalho de Melo1-0/+13
To avoid regressions such as the one fixed by 4a35a9027f64 ("Revert "perf pmu: Fix pmu events parsing rule""), where '-e intel_pt//u' got broken, with this new entry in this 'perf tests' subtest, we would have caught it before pushing upstream. Acked-by: Jiri Olsa <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kan Liang <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Wang Nan <[email protected]> Link: https://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15Merge remote-tracking branch 'tip/perf/urgent' into perf/coreArnaldo Carvalho de Melo18-24/+78
To pick up fixes, notably the revert for the intel_pt//u regression. Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
2018-05-15Merge tag 'perf-urgent-for-mingo-4.17-20180514' of ↵Ingo Molnar4-6/+29
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/urgent fixes from Arnaldo Carvalho de Melo: - Fix segfault when processing unknown threads in cs-etm (Leo Yan) - Fix "perf test inet_pton" on s390 failing due to missing inline (Thomas Richter) - Display all available events on 'perf annotate --stdio' (Jin Yao) - Add missing newline when parsing empty BPF proggie (Arnaldo Carvalho de Melo) Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Add reference for 'Simplifying ARM concurrency'Andrea Parri1-0/+6
The paper discusses the revised ARMv8 memory model; such revision had an important impact on the design of the LKMM. Signed-off-by: Andrea Parri <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Update ASPLOS informationAndrea Parri4-11/+12
ASPLOS 2018 was held in March: make sure this is reflected in header comments and references. Signed-off-by: Andrea Parri <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Fix coding style in 'lock.cat'Andrea Parri1-14/+14
This commit uses tabs for indentation and adds spaces around binary operator. Signed-off-by: Andrea Parri <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Remove out-of-date comments and code from lock.catAlan Stern1-9/+6
lock.cat contains old comments and code referring to the possibility of LKR events that are not part of an RMW pair. This is a holdover from when I though we might end up using LKR events to implement spin_is_locked(). Reword the comments to remove this assumption and replace domain(lk-rmw) in the code with LKR. Tested-by: Andrea Parri <[email protected]> [ paulmck: Pulled as lock-nest into previous line as discussed. ] Signed-off-by: Alan Stern <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Improve mixed-access checking in lock.catAlan Stern1-11/+11
The code in lock.cat which checks for normal read/write accesses to spinlock variables doesn't take into account the newly added RL and RU events. Add them into the test, and move the resulting code up near the start of the file, since a violation would indicate a pretty severe conceptual error in a litmus test. Tested-by: Andrea Parri <[email protected]> Signed-off-by: Alan Stern <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Improve comments in lock.catAlan Stern1-15/+36
This patch improves the comments in tools/memory-model/lock.cat. In addition to making the text more uniform and removing redundant comments, it adds a description of all the possible locking events that herd can generate. Tested-by: Andrea Parri <[email protected]> Signed-off-by: Alan Stern <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Remove duplicated code from lock.catAlan Stern1-22/+6
This patch simplifies the implementation of spin_is_locked in the LKMM. It capitalizes on the fact that a failed spin_trylock() and a spin_is_locked() which returns True have exactly the same semantics (those of READ_ONCE) and ordering properties (none). Therefore the two kinds of events can be combined and handled by the same code, instead of treated separately as they are currently. Tested-by: Andrea Parri <[email protected]> Signed-off-by: Alan Stern <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Flag "cumulativity" and "propagation" testsPaul E. McKenney3-5/+10
This commit flags WRC+pooncerelease+rmbonceonce+Once.litmus as being forbidden by smp_store_release() A-cumulativity and IRIW+mbonceonces+OnceOnce.litmus as being forbidden by the LKMM propagation rule. Suggested-by: Andrea Parri <[email protected]> Reported-by: Paolo Bonzini <[email protected]> [ paulmck: Updated wording as suggested by Alan Stern. ] Signed-off-by: Paul E. McKenney <[email protected]> Acked-by: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Add model support for spin_is_locked()Luc Maranget5-4/+129
This commit first adds a trivial macro for spin_is_locked() to linux-kernel.def. It also adds cat code for enumerating all possible matches of lock write events (set LKW) with islocked events returning true (set RL, for Read from Lock), and unlock write events (set UL) with islocked events returning false (set RU, for Read from Unlock). Note that this intentionally does not model uniprocessor kernels (CONFIG_SMP=n) built with CONFIG_DEBUG_SPINLOCK=n, in which spin_is_locked() unconditionally returns zero. It also adds a pair of litmus tests demonstrating the minimal ordering provided by spin_is_locked() in conjunction with spin_lock(). Will Deacon noted that this minimal ordering happens on ARMv8: https://lkml.kernel.org/r/[email protected] Notice that herd7 installations strictly older than version 7.49 do not handle the new constructs. Signed-off-by: Luc Maranget <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Reviewed-by: Alan Stern <[email protected]> Cc: Akira Yokosawa <[email protected]> Cc: Andrea Parri <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Boqun Feng <[email protected]> Cc: David Howells <[email protected]> Cc: Jade Alglave <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luc Maranget <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Add scripts to test memory modelPaul E. McKenney3-0/+160
This commit adds a pair of scripts that run the memory model on litmus tests, checking that the verification result of each litmus test matches the result flagged in the litmus test itself. These scripts permit easier checking of changes to the memory model against preconceived notions. To run the scripts, go to the tools/memory-model directory and type "scripts/checkalllitmus.sh". If all is well, the last line printed will be "All litmus tests verified as was expected." Signed-off-by: Paul E. McKenney <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Fix coding style in 'linux-kernel.def'Andrea Parri1-14/+14
This commit fixes white spaces around semicolons. Signed-off-by: Andrea Parri <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Model 'smp_store_mb()'Andrea Parri1-0/+1
This commit models 'smp_store_mb(x, val);' to be semantically equivalent to 'WRITE_ONCE(x, val); smp_mb();'. Suggested-by: Paolo Bonzini <[email protected]> Suggested-by: Peter Zijlstra <[email protected]> Signed-off-by: Andrea Parri <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Acked-by: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-order: Update the cheat-sheet to show that ↵Paul E. McKenney1-1/+1
smp_mb__after_atomic() orders later RMW operations The current cheat sheet does not claim that smp_mb__after_atomic() orders later RMW atomic operations, which it must, at least against earlier RMW atomic operations and whatever precedes them. This commit therefore adds the needed "Y". Signed-off-by: Paul E. McKenney <[email protected]> Acked-by: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-order: Improve key for SELF and SVPaul E. McKenney1-1/+2
The key for "SELF" was missing completely and the key for "SV" was a bit obtuse. This commit therefore adds a key for "SELF" and improves the one for "SV". Reported-by: Paolo Bonzini <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Acked-by: Alan Stern <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
2018-05-15tools/memory-model: Fix cheat sheet typoPaolo Bonzini1-1/+1
"RWM" should be "RMW". Signed-off-by: Paolo Bonzini <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
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