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Date: Thu, 26 Apr 2012 20:54:48 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Dave Jones <davej@...hat.com>, David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org, Linux Kernel <linux-kernel@...r.kernel.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Subject: Re: 3.4-rc4 oom killer out of control. On Thu, Apr 26, 2012 at 06:44:19PM -0400, Dave Jones wrote: > On Thu, Apr 26, 2012 at 03:20:34PM -0700, David Rientjes wrote: > > On Thu, 26 Apr 2012, Dave Jones wrote: > > > > > /sys/kernel/mm/ksm/full_scans is increasing constantly > > > > > > full_scans: 146370 > > > pages_shared: 1 > > > pages_sharing: 4 > > > pages_to_scan: 1250 > > > pages_unshared: 867 > > > pages_volatile: 1 > > > run: 1 > > > sleep_millisecs: 20 > > > > > > > full_scans is just a counter of how many times it has scanned mergable > > memory so it should be increasing constantly. Whether pages_to_scan == > > 1250 and sleep_millisecs == 20 is good for your system is unknown. You > > may want to try disabling ksm entirely (echo 0 > /sys/kernel/mm/ksm/run) > > to see if it significantly increases responsiveness for your workload. > You didn't happen to see any RCU CPU stalls, did you? -- Steve > Disabling it stops it hogging the cpu obviously, but there's still 8G of RAM > and 1G of used swap sitting around doing something. > > # free > total used free shared buffers cached > Mem: 8149440 8025716 123724 0 148 7764 > -/+ buffers/cache: 8017804 131636 > Swap: 1423736 1066112 357624 > > SysRq : Show Memory > Mem-Info: > Node 0 DMA per-cpu: > CPU 0: hi: 0, btch: 1 usd: 0 > CPU 1: hi: 0, btch: 1 usd: 0 > CPU 2: hi: 0, btch: 1 usd: 0 > CPU 3: hi: 0, btch: 1 usd: 0 > Node 0 DMA32 per-cpu: > CPU 0: hi: 186, btch: 31 usd: 19 > CPU 1: hi: 186, btch: 31 usd: 175 > CPU 2: hi: 186, btch: 31 usd: 140 > CPU 3: hi: 186, btch: 31 usd: 182 > Node 0 Normal per-cpu: > CPU 0: hi: 186, btch: 31 usd: 167 > CPU 1: hi: 186, btch: 31 usd: 176 > CPU 2: hi: 186, btch: 31 usd: 102 > CPU 3: hi: 186, btch: 31 usd: 94 > active_anon:1529737 inactive_anon:306307 isolated_anon:0 > active_file:1124 inactive_file:2170 isolated_file:0 > unevictable:1414 dirty:1 writeback:0 unstable:0 > free:35645 slab_reclaimable:10150 slab_unreclaimable:56678 > mapped:404 shmem:48 pagetables:45796 bounce:0 > Node 0 DMA free:15876kB min:128kB low:160kB high:192kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15652kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:32kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes > lowmem_reserve[]: 0 3246 8034 8034 > Node 0 DMA32 free:62632kB min:27252kB low:34064kB high:40876kB active_anon:2637356kB inactive_anon:527504kB active_file:72kB inactive_file:84kB unevictable:788kB isolated(anon):0kB isolated(file):0kB present:3324200kB mlocked:788kB dirty:0kB writeback:0kB mapped:212kB shmem:72kB slab_reclaimable:944kB slab_unreclaimable:24736kB kernel_stack:336kB pagetables:30028kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:116 all_unreclaimable? no > lowmem_reserve[]: 0 0 4788 4788 > Node 0 Normal free:64072kB min:40196kB low:50244kB high:60292kB active_anon:3481592kB inactive_anon:697724kB active_file:4424kB inactive_file:8596kB unevictable:4868kB isolated(anon):0kB isolated(file):0kB present:4902912kB mlocked:4868kB dirty:4kB writeback:0kB mapped:1404kB shmem:120kB slab_reclaimable:39656kB slab_unreclaimable:201944kB kernel_stack:2968kB pagetables:153156kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no > lowmem_reserve[]: 0 0 0 0 > Node 0 DMA: 1*4kB 0*8kB 0*16kB 0*32kB 2*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15876kB > Node 0 DMA32: 214*4kB 124*8kB 65*16kB 55*32kB 32*64kB 15*128kB 9*256kB 7*512kB 7*1024kB 4*2048kB 8*4096kB = 62632kB > Node 0 Normal: 670*4kB 573*8kB 402*16kB 468*32kB 171*64kB 73*128kB 31*256kB 12*512kB 1*1024kB 0*2048kB 0*4096kB = 64064kB > 5683 total pagecache pages > 2341 pages in swap cache > Swap cache stats: add 2029253, delete 2026912, find 483987/484568 > Free swap = 343568kB > Total swap = 1423736kB > 2097136 pages RAM > 59776 pages reserved > 891838 pages shared > 1996710 pages non-shared > > > All that anon memory seems to be unaccounted for. > > [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name > [ 351] 0 351 4372 2 3 -17 -1000 udevd > [ 818] 0 818 18861 26 0 -17 -1000 sshd > [ 1199] 0 1199 4372 2 3 -17 -1000 udevd > [ 1214] 0 1214 4371 2 1 -17 -1000 udevd > [28963] 0 28963 30988 271 2 0 0 sshd > [28987] 81 28987 5439 150 3 -13 -900 dbus-daemon > [28990] 0 28990 7085 136 0 0 0 systemd-logind > [28995] 1000 28995 31023 373 1 0 0 sshd > [29008] 1000 29008 29864 875 2 0 0 bash > [29132] 1000 29132 44732 155 3 0 0 sudo > [29135] 0 29135 29870 1094 3 0 0 bash > [29521] 0 29521 4877 196 0 0 0 systemd-kmsg-sy > [29541] 0 29541 27232 211 3 0 0 agetty > [29553] 0 29553 29870 875 2 0 0 bash > > Dave > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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