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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [linux-4.1 bisection] complete test-amd64-i386-xl-qemuu-winxpsp3
branch xen-unstable xenbranch xen-unstable job test-amd64-i386-xl-qemuu-winxpsp3 testid windows-install Tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git Tree: qemu git://xenbits.xen.org/qemu-xen-traditional.git Tree: qemuu git://xenbits.xen.org/qemu-xen.git Tree: xen git://xenbits.xen.org/xen.git *** Found and reproduced problem changeset *** Bug is in tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git Bug introduced: c5ad33184354260be6d05de57e46a5498692f6d6 Bug not present: c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/97493/ commit c5ad33184354260be6d05de57e46a5498692f6d6 Author: Lukasz Odzioba <lukasz.odzioba@xxxxxxxxx> Date: Fri Jun 24 14:50:01 2016 -0700 mm/swap.c: flush lru pvecs on compound page arrival [ Upstream commit 8f182270dfec432e93fae14f9208a6b9af01009f ] Currently we can have compound pages held on per cpu pagevecs, which leads to a lot of memory unavailable for reclaim when needed. In the systems with hundreads of processors it can be GBs of memory. On of the way of reproducing the problem is to not call munmap explicitly on all mapped regions (i.e. after receiving SIGTERM). After that some pages (with THP enabled also huge pages) may end up on lru_add_pvec, example below. void main() { #pragma omp parallel { size_t size = 55 * 1000 * 1000; // smaller than MEM/CPUS void *p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS , -1, 0); if (p != MAP_FAILED) memset(p, 0, size); //munmap(p, size); // uncomment to make the problem go away } } When we run it with THP enabled it will leave significant amount of memory on lru_add_pvec. This memory will be not reclaimed if we hit OOM, so when we run above program in a loop: for i in `seq 100`; do ./a.out; done many processes (95% in my case) will be killed by OOM. The primary point of the LRU add cache is to save the zone lru_lock contention with a hope that more pages will belong to the same zone and so their addition can be batched. The huge page is already a form of batched addition (it will add 512 worth of memory in one go) so skipping the batching seems like a safer option when compared to a potential excess in the caching which can be quite large and much harder to fix because lru_add_drain_all is way to expensive and it is not really clear what would be a good moment to call it. Similarly we can reproduce the problem on lru_deactivate_pvec by adding: madvise(p, size, MADV_FREE); after memset. This patch flushes lru pvecs on compound page arrival making the problem less severe - after applying it kill rate of above example drops to 0%, due to reducing maximum amount of memory held on pvec from 28MB (with THP) to 56kB per CPU. Suggested-by: Michal Hocko <mhocko@xxxxxxxx> Link: http://lkml.kernel.org/r/1466180198-18854-1-git-send-email-lukasz.odzioba@xxxxxxxxx Signed-off-by: Lukasz Odzioba <lukasz.odzioba@xxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Cc: Ming Li <mingli199x@xxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx> For bisection revision-tuple graph see: http://logs.test-lab.xenproject.org/osstest/results/bisect/linux-4.1/test-amd64-i386-xl-qemuu-winxpsp3.windows-install.html Revision IDs in each graph node refer, respectively, to the Trees above. ---------------------------------------- Running cs-bisection-step --graph-out=/home/logs/results/bisect/linux-4.1/test-amd64-i386-xl-qemuu-winxpsp3.windows-install --summary-out=tmp/97493.bisection-summary --basis-template=96211 --blessings=real,real-bisect linux-4.1 test-amd64-i386-xl-qemuu-winxpsp3 windows-install Searching for failure / basis pass: 97434 fail [host=huxelrebe0] / 96211 [host=italia1] 96183 [host=fiano0] 96160 [host=elbling1] 95848 [host=chardonnay1] 95818 [host=fiano1] 95591 [host=elbling0] 95517 [host=pinot1] 95455 ok. Failure / basis pass flights: 97434 / 95455 (tree with no url: minios) (tree with no url: ovmf) (tree with no url: seabios) Tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git Tree: qemu git://xenbits.xen.org/qemu-xen-traditional.git Tree: qemuu git://xenbits.xen.org/qemu-xen.git Tree: xen git://xenbits.xen.org/xen.git Latest 5880876e94699ce010554f483ccf0009997955ca c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f ea210c52abb6458e39f5365f7f2c3abb9c191c47 Basis pass 888172862fa78505c4e4674c205a06586443d83f c530a75c1e6a472b0eb9558310b518f0dfcd8860 df553c056104e3dd8a2bd2e72539a57c4c085bae 44a072f0de0d57c95c2212bbce02888832b7b74f c2a17869d5dcd845d646bf4db122cad73596a2be Generating revisions with ./adhoc-revtuple-generator git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git#888172862fa78505c4e4674c205a06586443d83f-5880876e94699ce010554f483ccf0009997955ca git://xenbits.xen.org/osstest/linux-firmware.git#c530a75c1e6a472b0eb9558310b518f0dfcd8860-c530a75c1e6a472b0eb9558310b518f0dfcd8860 git://xenbits.xen.org/qemu-xen-traditional.git#df553c056104e3dd8a2bd2e72539a57c4c085bae-6e20809727261599e8527c456eb078c0e89139a1 git://xenbits.xen.org/qemu-xen.git#44a072f0de0d57c95c2212bbce02888832b7b74f-44a072f0de0d57c95c2212bbce02888832b7b74f git://xenbits.xen.org/xen.git#c2a17869d5dcd845d646bf4db122cad73596a2be-ea210c52abb6458e39f5365f7f2c3abb9c191c47 Loaded 4007 nodes in revision graph Searching for test results: 95408 [host=fiano0] 95455 pass 888172862fa78505c4e4674c205a06586443d83f c530a75c1e6a472b0eb9558310b518f0dfcd8860 df553c056104e3dd8a2bd2e72539a57c4c085bae 44a072f0de0d57c95c2212bbce02888832b7b74f c2a17869d5dcd845d646bf4db122cad73596a2be 95517 [host=pinot1] 95591 [host=elbling0] 95848 [host=chardonnay1] 95818 [host=fiano1] 96211 [host=italia1] 96160 [host=elbling1] 96183 [host=fiano0] 97279 fail irrelevant 97434 fail 5880876e94699ce010554f483ccf0009997955ca c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f ea210c52abb6458e39f5365f7f2c3abb9c191c47 97439 pass c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97474 pass c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97424 pass a56c72fc0cda3382a339172a35c76cea10df72ad c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97412 pass 888172862fa78505c4e4674c205a06586443d83f c530a75c1e6a472b0eb9558310b518f0dfcd8860 df553c056104e3dd8a2bd2e72539a57c4c085bae 44a072f0de0d57c95c2212bbce02888832b7b74f c2a17869d5dcd845d646bf4db122cad73596a2be 97436 fail 5880876e94699ce010554f483ccf0009997955ca c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f ea210c52abb6458e39f5365f7f2c3abb9c191c47 97455 fail 7421921581dc77ffb4017ce747f95931f74a624b c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97420 fail irrelevant 97394 fail 5880876e94699ce010554f483ccf0009997955ca c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f ea210c52abb6458e39f5365f7f2c3abb9c191c47 97445 fail cd18a79a6445fecf42114a9124c5ff23d72201cd c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97431 fail fc74ace8df9bffbab3b886686db02f0809bdc5e9 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97447 fail 8f82841376c2dc033b6b3f976cfb463678c8b80f c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97458 fail cc6fd729b8a04fbb4b88e45209c1241dd89a3fbe c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97463 fail 683854270f84daa09baffe2b21d64ec88c614fa9 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97467 fail c5ad33184354260be6d05de57e46a5498692f6d6 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97480 fail c5ad33184354260be6d05de57e46a5498692f6d6 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97485 pass c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97489 blocked c5ad33184354260be6d05de57e46a5498692f6d6 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 97493 fail c5ad33184354260be6d05de57e46a5498692f6d6 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 Searching for interesting versions Result found: flight 95455 (pass), for basis pass Result found: flight 97394 (fail), for basis failure Repro found: flight 97412 (pass), for basis pass Repro found: flight 97434 (fail), for basis failure 0 revisions at c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 c530a75c1e6a472b0eb9558310b518f0dfcd8860 6e20809727261599e8527c456eb078c0e89139a1 44a072f0de0d57c95c2212bbce02888832b7b74f 7da483b0236d8974cc97f81780dcf8e559a63175 No revisions left to test, checking graph state. Result found: flight 97439 (pass), for last pass Result found: flight 97467 (fail), for first failure Repro found: flight 97474 (pass), for last pass Repro found: flight 97480 (fail), for first failure Repro found: flight 97485 (pass), for last pass Repro found: flight 97493 (fail), for first failure *** Found and reproduced problem changeset *** Bug is in tree: linux git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git Bug introduced: c5ad33184354260be6d05de57e46a5498692f6d6 Bug not present: c5bcec6cbcbf520f088dc7939934bbf10c20c5a5 Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/97493/ commit c5ad33184354260be6d05de57e46a5498692f6d6 Author: Lukasz Odzioba <lukasz.odzioba@xxxxxxxxx> Date: Fri Jun 24 14:50:01 2016 -0700 mm/swap.c: flush lru pvecs on compound page arrival [ Upstream commit 8f182270dfec432e93fae14f9208a6b9af01009f ] Currently we can have compound pages held on per cpu pagevecs, which leads to a lot of memory unavailable for reclaim when needed. In the systems with hundreads of processors it can be GBs of memory. On of the way of reproducing the problem is to not call munmap explicitly on all mapped regions (i.e. after receiving SIGTERM). After that some pages (with THP enabled also huge pages) may end up on lru_add_pvec, example below. void main() { #pragma omp parallel { size_t size = 55 * 1000 * 1000; // smaller than MEM/CPUS void *p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS , -1, 0); if (p != MAP_FAILED) memset(p, 0, size); //munmap(p, size); // uncomment to make the problem go away } } When we run it with THP enabled it will leave significant amount of memory on lru_add_pvec. This memory will be not reclaimed if we hit OOM, so when we run above program in a loop: for i in `seq 100`; do ./a.out; done many processes (95% in my case) will be killed by OOM. The primary point of the LRU add cache is to save the zone lru_lock contention with a hope that more pages will belong to the same zone and so their addition can be batched. The huge page is already a form of batched addition (it will add 512 worth of memory in one go) so skipping the batching seems like a safer option when compared to a potential excess in the caching which can be quite large and much harder to fix because lru_add_drain_all is way to expensive and it is not really clear what would be a good moment to call it. Similarly we can reproduce the problem on lru_deactivate_pvec by adding: madvise(p, size, MADV_FREE); after memset. This patch flushes lru pvecs on compound page arrival making the problem less severe - after applying it kill rate of above example drops to 0%, due to reducing maximum amount of memory held on pvec from 28MB (with THP) to 56kB per CPU. Suggested-by: Michal Hocko <mhocko@xxxxxxxx> Link: http://lkml.kernel.org/r/1466180198-18854-1-git-send-email-lukasz.odzioba@xxxxxxxxx Signed-off-by: Lukasz Odzioba <lukasz.odzioba@xxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Cc: Ming Li <mingli199x@xxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx> pnmtopng: 77 colors found Revision graph left in /home/logs/results/bisect/linux-4.1/test-amd64-i386-xl-qemuu-winxpsp3.windows-install.{dot,ps,png,html,svg}. ---------------------------------------- 97493: tolerable ALL FAIL flight 97493 linux-4.1 real-bisect [real] http://logs.test-lab.xenproject.org/osstest/logs/97493/ Failures :-/ but no regressions. Tests which did not succeed, including tests which could not be run: test-amd64-i386-xl-qemuu-winxpsp3 9 windows-install fail baseline untested jobs: test-amd64-i386-xl-qemuu-winxpsp3 fail ------------------------------------------------------------ sg-report-flight on osstest.test-lab.xenproject.org logs: /home/logs/logs images: /home/logs/images Logs, config files, etc. are available at http://logs.test-lab.xenproject.org/osstest/logs Explanation of these reports, and of osstest in general, is at http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README.email;hb=master http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README;hb=master Test harness code can be found at http://xenbits.xen.org/gitweb?p=osstest.git;a=summary _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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