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path: root/tools/testing/selftests/kvm/demand_paging_test.c
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2020-03-18KVM: selftests: Rework timespec functions and usageAndrew Jones1-21/+16
The steal_time test's timespec stop condition was wrong and should have used the timespec functions instead to avoid being wrong, but timespec_diff had a strange interface. Rework all the timespec API and its use. Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: virt_map should take npages, not sizeAndrew Jones1-2/+1
Also correct the comment and prototype for vm_create_default(), as it takes a number of pages, not a size. Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Use consistent message for test skippingAndrew Jones1-2/+2
Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Enable printf format warnings for TEST_ASSERTAndrew Jones1-1/+1
Use the format attribute to enable printf format warnings, and then fix them all. Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: s390x: Provide additional num-guest-pages adjustmentAndrew Jones1-4/+0
s390 requires 1M aligned guest sizes. Embedding the rounding in vm_adjust_num_guest_pages() allows us to remove it from a few other places. Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Rework debug message printingAndrew Jones1-27/+27
There were a few problems with the way we output "debug" messages. The first is that we used DEBUG() which is defined when NDEBUG is not defined, but NDEBUG will never be defined for kselftests because it relies too much on assert(). The next is that most of the DEBUG() messages were actually "info" messages, which users may want to turn off if they just want a silent test that either completes or asserts. Finally, a debug message output from a library function, and thus for all tests, was annoying when its information wasn't interesting for a test. Rework these messages so debug messages only output when DEBUG is defined and info messages output unless QUIET is defined. Also name the functions pr_debug and pr_info and make sure that when they're disabled we eat all the inputs. The later avoids unused variable warnings when the variables were only defined for the purpose of printing. Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Time guest demand pagingBen Gardon1-1/+49
In order to quantify demand paging performance, time guest execution during demand paging. Signed-off-by: Ben Gardon <[email protected]> [Move timespec-diff to test_util.h] Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Support multiple vCPUs in demand paging testBen Gardon1-82/+171
Most VMs have multiple vCPUs, the concurrent execution of which has a substantial impact on demand paging performance. Add an option to create multiple vCPUs to each access disjoint regions of memory. Signed-off-by: Ben Gardon <[email protected]> [guest_code() can't return, use GUEST_ASSERT(). Ensure the number of guests pages is compatible with the host.] Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Pass args to vCPU in global vCPU args structBen Gardon1-11/+27
In preparation for supporting multiple vCPUs in the demand paging test, pass arguments to the vCPU in a consolidated global struct instead of syncing multiple globals. Signed-off-by: Ben Gardon <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Add memory size parameter to the demand paging testBen Gardon1-21/+36
Add an argument to allow the demand paging test to work on larger and smaller guest sizes. Signed-off-by: Ben Gardon <[email protected]> [Rewrote parse_size() to simplify and provide user more flexibility as to how sizes are input. Also fixed size overflow assert.] Signed-off-by: Andrew Jones <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Add configurable demand paging delayBen Gardon1-7/+25
When running the demand paging test with the -u option, the User Fault FD handler essentially adds an arbitrary delay to page fault resolution. To enable better simulation of a real demand paging scenario, add a configurable delay to the UFFD handler. Reviewed-by: Peter Xu <[email protected]> Signed-off-by: Ben Gardon <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-03-16KVM: selftests: Add demand paging content to the demand paging testBen Gardon1-4/+206
The demand paging test is currently a simple page access test which, while potentially useful, doesn't add much versus the existing dirty logging test. To improve the demand paging test, add a basic userfaultfd demand paging implementation. Signed-off-by: Ben Gardon <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-02-24KVM: selftests: Create a demand paging testBen Gardon1-0/+283
While userfaultfd, KVM's demand paging implementation, is not specific to KVM, having a benchmark for its performance will be useful for guiding performance improvements to KVM. As a first step towards creating a userfaultfd demand paging test, create a simple memory access test, based on dirty_log_test. Reviewed-by: Oliver Upton <[email protected]> Signed-off-by: Ben Gardon <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
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