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2014-10-09mm: introduce VM_BUG_ON_MMSasha Levin1-0/+10
Very similar to VM_BUG_ON_PAGE and VM_BUG_ON_VMA, dump struct_mm when the bug is hit. [[email protected]: coding-style fixes] [[email protected]: fix build] [[email protected]: fix build some more] [[email protected]: do strange things to avoid doing strange things for the comma separators] Signed-off-by: Sasha Levin <[email protected]> Cc: Dave Jones <[email protected]> Signed-off-by: Michal Hocko <[email protected]> Cc: Valdis Kletnieks <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-10-09mm: introduce VM_BUG_ON_VMASasha Levin1-0/+8
Very similar to VM_BUG_ON_PAGE but dumps VMA information instead. Signed-off-by: Sasha Levin <[email protected]> Reviewed-by: Naoya Horiguchi <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Konstantin Khlebnikov <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: Minchan Kim <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-10-09mm: introduce dump_vmaSasha Levin1-0/+2
Introduce a helper to dump information about a VMA, this also makes dump_page_flags more generic and re-uses that so the output looks very similar to dump_page: [ 61.903437] vma ffff88070f88be00 start 00007fff25970000 end 00007fff25992000 [ 61.903437] next ffff88070facd600 prev ffff88070face400 mm ffff88070fade000 [ 61.903437] prot 8000000000000025 anon_vma ffff88070fa1e200 vm_ops (null) [ 61.903437] pgoff 7ffffffdd file (null) private_data (null) [ 61.909129] flags: 0x100173(read|write|mayread|maywrite|mayexec|growsdown|account) [[email protected]: make dump_vma() require CONFIG_DEBUG_VM] [[email protected]: fix dump_vma() compilation] Signed-off-by: Sasha Levin <[email protected]> Reviewed-by: Naoya Horiguchi <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Konstantin Khlebnikov <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: Minchan Kim <[email protected]> Signed-off-by: Stephen Warren <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-08-06include/linux/mmdebug.h: add VM_WARN_ONCE()Andrew Morton1-0/+2
It was missing... Cc: Konstantin Khlebnikov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Hugh Dickins <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-06-04mm: pass VM_BUG_ON() reason to dump_page()Dave Hansen1-2/+9
I recently added a patch to let folks pass a "reason" string dump_page() which gets dumped out along with the page's data. This essentially saves the bug-reader a trip in to the source to figure out why we BUG_ON()'d. The new VM_BUG_ON_PAGE() passes in NULL for "reason". It seems like we might as well pass the BUG_ON() condition if we have it. This will bloat kernels a bit with ~160 new strings, but this is all under a debugging option anyway. page:ffffea0008560280 count:1 mapcount:0 mapping:(null) index:0x0 page flags: 0xbfffc0000000001(locked) page dumped because: VM_BUG_ON_PAGE(PageLocked(page)) ------------[ cut here ]------------ kernel BUG at /home/davehans/linux.git/mm/filemap.c:464! invalid opcode: 0000 [#1] SMP CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0+ #251 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 ... [[email protected]: include stringify.h] Signed-off-by: Dave Hansen <[email protected]> Acked-by: Kirill A. Shutemov <[email protected]> Acked-by: Davidlohr Bueso <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-06-04include/linux/mmdebug.h: add VM_WARN_ON() and VM_WARN_ON_ONCE()Andrew Morton1-0/+4
WARN_ON() and WARN_ON_ONCE(), dependent on CONFIG_DEBUG_VM Cc: Sebastian Ott <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-04-07mm: use 'const char *' insted of 'char *' for reason in dump_page()Kirill A. Shutemov1-2/+2
I tried to use 'dump_page(page, __func__)' for debugging, but it triggers warning: warning: passing argument 2 of `dump_page' discards `const' qualifier from pointer target type [enabled by default] Let's convert 'reason' to 'const char *' in dump_page() and friends: we shouldn't modify it anyway. Signed-off-by: Kirill A. Shutemov <[email protected]> Cc: Dave Hansen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2014-01-23mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGESasha Levin1-0/+9
Most of the VM_BUG_ON assertions are performed on a page. Usually, when one of these assertions fails we'll get a BUG_ON with a call stack and the registers. I've recently noticed based on the requests to add a small piece of code that dumps the page to various VM_BUG_ON sites that the page dump is quite useful to people debugging issues in mm. This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what VM_BUG_ON() does, also dumps the page before executing the actual BUG_ON. [[email protected]: fix up includes] Signed-off-by: Sasha Levin <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2012-05-29bug: completely remove code generated by disabled VM_BUG_ON()Konstantin Khlebnikov1-1/+1
Even if CONFIG_DEBUG_VM=n gcc genereates code for some VM_BUG_ON() for example VM_BUG_ON(!PageCompound(page) || !PageHead(page)); in do_huge_pmd_wp_page() generates 114 bytes of code. But they mostly disappears when I split this VM_BUG_ON into two: -VM_BUG_ON(!PageCompound(page) || !PageHead(page)); +VM_BUG_ON(!PageCompound(page)); +VM_BUG_ON(!PageHead(page)); weird... but anyway after this patch code disappears completely. add/remove: 0/0 grow/shrink: 7/97 up/down: 135/-1784 (-1649) Signed-off-by: Konstantin Khlebnikov <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Cong Wang <[email protected]> Cc: Hugh Dickins <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2010-08-09gcc-4.6: mm: fix unused but set warningsAndi Kleen1-1/+1
No real bugs, just some dead code and some fixups. Signed-off-by: Andi Kleen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2009-12-12drop explicit include of autoconf.hSam Ravnborg1-2/+0
kbuild.h forces include of autoconf.h on the commandline using -include - so we do not need to include the file explicit. Signed-off-by: Sam Ravnborg <[email protected]> Signed-off-by: Michal Marek <[email protected]>
2008-06-19x86, MM: virtual address debug, cleanupsIngo Molnar1-2/+2
Signed-off-by: Ingo Molnar <[email protected]>
2008-06-19MM: virtual address debugJiri Slaby1-0/+18
Add some (configurable) expensive sanity checking to catch wrong address translations on x86. - create linux/mmdebug.h file to be able include this file in asm headers to not get unsolvable loops in header files - __phys_addr on x86_32 became a function in ioremap.c since PAGE_OFFSET, is_vmalloc_addr and VMALLOC_* non-constasts are undefined if declared in page_32.h - add __phys_addr_const for initializing doublefault_tss.__cr3 Tested on 386, 386pae, x86_64 and x86_64 numa=fake=2. Contains Andi's enable numa virtual address debug patch. Signed-off-by: Jiri Slaby <[email protected]> Cc: Andi Kleen <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
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