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Date: Wed, 10 Jun 2009 16:56:38 +0800 From: Wu Fengguang <fengguang.wu@...el.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: Johannes Weiner <hannes@...xchg.org>, Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com>, Hugh Dickins <hugh.dickins@...cali.co.uk>, Andi Kleen <andi@...stfloor.org>, Minchan Kim <minchan.kim@...il.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [patch v3] swap: virtual swap readahead On Wed, Jun 10, 2009 at 04:32:49PM +0800, KAMEZAWA Hiroyuki wrote: > On Wed, 10 Jun 2009 16:11:32 +0800 > Wu Fengguang <fengguang.wu@...el.com> wrote: > > > On Wed, Jun 10, 2009 at 03:45:08PM +0800, Johannes Weiner wrote: > > > Hi Fengguang, > > > > > > On Wed, Jun 10, 2009 at 01:03:42PM +0800, Wu Fengguang wrote: > > > > On Wed, Jun 10, 2009 at 03:37:02AM +0800, Johannes Weiner wrote: > > > > > On Tue, Jun 09, 2009 at 09:01:28PM +0200, Johannes Weiner wrote: > > > > > > [resend with lists cc'd, sorry] > > > > > > > > > > [and fixed Hugh's email. crap] > > > > > > > > > > > Hi, > > > > > > > > > > > > here is a new iteration of the virtual swap readahead. Per Hugh's > > > > > > suggestion, I moved the pte collecting to the callsite and thus out > > > > > > ouf swap code. Unfortunately, I had to bound page_cluster due to an > > > > > > array of that many swap entries on the stack, but I think it is better > > > > > > to limit the cluster size to a sane maximum than using dynamic > > > > > > allocation for this purpose. > > > > > > > > Hi Johannes, > > > > > > > > When stress testing your patch, I found it triggered many OOM kills. > > > > Around the time of last OOMs, the memory usage is: > > > > > > > > total used free shared buffers cached > > > > Mem: 474 468 5 0 0 239 > > > > -/+ buffers/cache: 229 244 > > > > Swap: 1023 221 802 > > > > > > Wow, that really confused me for a second as we shouldn't read more > > > pages ahead than without the patch, probably even less under stress. > > > > Yup - swap readahead is much more challenging than sequential readahead, > > in that it must be accurate enough given some really obscure patterns. > > > > > So the problem has to be a runaway reading. And indeed, severe > > > stupidity here: > > > > > > + window = cluster << PAGE_SHIFT; > > > + min = addr & ~(window - 1); > > > + max = min + cluster; > > > + /* > > > + * To keep the locking/highpte mapping simple, stay > > > + * within the PTE range of one PMD entry. > > > + */ > > > + limit = addr & PMD_MASK; > > > + if (limit > min) > > > + min = limit; > > > + limit = pmd_addr_end(addr, max); > > > + if (limit < max) > > > + max = limit; > > > + limit = max - min; > > > > > > The mistake is at the initial calculation of max. It should be > > > > > > max = min + window; > > > > > > The resulting problem is that min could get bigger than max when > > > cluster is bigger than PMD_SHIFT. Did you use page_cluster == 5? > > > > No I use the default 3. > > > > btw, the mistake reflects bad named variables. How about rename > > cluster => pages > > window => bytes > > ? > > > > > The initial min is aligned to a value below the PMD boundary and max > > > based on it with a too small offset, staying below the PMD boundary as > > > well. When min is rounded up, this becomes a bit large: > > > > > > limit = max - min; > > > > > > So if my brain is already functioning, fixing the initial max should > > > be enough because either > > > > > > o window is smaller than PMD_SIZE, than we won't round down > > > below a PMD boundary in the first place or > > > > > > o window is bigger than PMD_SIZE, than we can round down below > > > a PMD boundary but adding window to that is garuanteed to > > > cross the boundary again > > > > > > and thus max is always bigger than min. > > > > > > Fengguang, does this make sense? If so, the patch below should fix > > > it. > > > > Too bad, a quick test of the below patch freezes the box.. > > > > + window = cluster << PAGE_SHIFT; > + min = addr & ~(window - 1); > + max = min + cluster; > > max = min + window; # this is fixed. then, > > + /* > + * To keep the locking/highpte mapping simple, stay > + * within the PTE range of one PMD entry. > + */ > + limit = addr & PMD_MASK; > + if (limit > min) > + min = limit; > + limit = pmd_addr_end(addr, max); > + if (limit < max) > + max = limit; > + limit = max - min; > > limit = (max - min) >> PAGE_SHIFT; > > + ptep = pte_offset_map_lock(mm, pmd, min, &ptl); > + for (i = nr = 0; i < limit; i++) > + if (is_swap_pte(ptep[i])) > + entries[nr++] = pte_to_swp_entry(ptep[i]); > + pte_unmap_unlock(ptep, ptl); Yes it worked! But then I run into page allocation failures: [ 340.639803] Xorg: page allocation failure. order:4, mode:0x40d0 [ 340.645744] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303 [ 340.651839] Call Trace: [ 340.654289] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0 [ 340.660645] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0 [ 340.666472] [<ffffffff810f8608>] __kmalloc+0x198/0x250 [ 340.671786] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 340.678746] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 340.685527] [<ffffffff81079ead>] ? trace_hardirqs_on+0xd/0x10 [ 340.691356] [<ffffffff81542b49>] ? mutex_unlock+0x9/0x10 [ 340.696771] [<ffffffffa00f5b7d>] drm_ioctl+0x12d/0x3d0 [drm] [ 340.702518] [<ffffffffa014be20>] ? i915_gem_execbuffer+0x0/0x11e0 [i915] [ 340.709301] [<ffffffff81271f1a>] ? __up_read+0x2a/0xb0 [ 340.714529] [<ffffffff8110ba8d>] vfs_ioctl+0x7d/0xa0 [ 340.719578] [<ffffffff8110bb3a>] do_vfs_ioctl+0x8a/0x580 [ 340.724969] [<ffffffff8106b236>] ? up_read+0x26/0x30 [ 340.730024] [<ffffffff81544b04>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 340.736375] [<ffffffff8110c07a>] sys_ioctl+0x4a/0x80 [ 340.741430] [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b [ 340.747434] Mem-Info: [ 340.749730] Node 0 DMA per-cpu: [ 340.752896] CPU 0: hi: 0, btch: 1 usd: 0 [ 340.757679] CPU 1: hi: 0, btch: 1 usd: 0 [ 340.762462] Node 0 DMA32 per-cpu: [ 340.765797] CPU 0: hi: 186, btch: 31 usd: 161 [ 340.770582] CPU 1: hi: 186, btch: 31 usd: 0 [ 340.775367] Active_anon:38344 active_file:6556 inactive_anon:41644 [ 340.775368] inactive_file:4210 unevictable:4 dirty:1 writeback:10 unstable:1 [ 340.775370] free:3136 slab:15738 mapped:8023 pagetables:6294 bounce:0 [ 340.795166] Node 0 DMA free:2024kB min:84kB low:104kB high:124kB active_anon:5296kB inactive_anon:5772kB active_file:644kB inactive_file:612kB unevictable:0kB present:15164kB pages_scanned:0 all_unreclaimable? no [ 340.814007] lowmem_reserve[]: 0 483 483 483 [ 340.818277] Node 0 DMA32 free:10520kB min:2768kB low:3460kB high:4152kB active_anon:148080kB inactive_anon:160804kB active_file:25580kB inactive_file:16228kB unevictable:16kB present:495008kB pages_scanned:0 all_unreclaimable? no [ 340.838594] lowmem_reserve[]: 0 0 0 0 [ 340.842338] Node 0 DMA: 87*4kB 14*8kB 2*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2028kB [ 340.853398] Node 0 DMA32: 2288*4kB 24*8kB 4*16kB 2*32kB 3*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 10560kB [ 340.864874] 59895 total pagecache pages [ 340.868720] 4176 pages in swap cache [ 340.872315] Swap cache stats: add 99021, delete 94845, find 8313/23463 [ 340.878847] Free swap = 780376kB [ 340.882178] Total swap = 1048568kB [ 340.889619] 131072 pages RAM [ 340.892527] 9628 pages reserved [ 340.895677] 126767 pages shared [ 340.898836] 60472 pages non-shared [ 341.026977] Xorg: page allocation failure. order:4, mode:0x40d0 [ 341.032900] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303 [ 341.038989] Call Trace: [ 341.041451] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0 [ 341.047801] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0 [ 341.053628] [<ffffffff810f7840>] __remote_slab_alloc_node+0xc0/0x130 [ 341.060073] [<ffffffff810f78e5>] __remote_slab_alloc+0x35/0xc0 [ 341.065983] [<ffffffff810f76e4>] ? __slab_alloc_page+0x314/0x3b0 [ 341.072070] [<ffffffff810f8528>] __kmalloc+0xb8/0x250 [ 341.077220] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 341.084184] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 341.090963] [<ffffffff81079ead>] ? trace_hardirqs_on+0xd/0x10 [ 341.096791] [<ffffffff81542b49>] ? mutex_unlock+0x9/0x10 [ 341.102197] [<ffffffffa00f5b7d>] drm_ioctl+0x12d/0x3d0 [drm] [ 341.107948] [<ffffffffa014be20>] ? i915_gem_execbuffer+0x0/0x11e0 [i915] [ 341.114726] [<ffffffff81271f1a>] ? __up_read+0x2a/0xb0 [ 341.119948] [<ffffffff8110ba8d>] vfs_ioctl+0x7d/0xa0 [ 341.124996] [<ffffffff8110bb3a>] do_vfs_ioctl+0x8a/0x580 [ 341.130389] [<ffffffff8106b236>] ? up_read+0x26/0x30 [ 341.135436] [<ffffffff81544b04>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 341.141787] [<ffffffff8110c07a>] sys_ioctl+0x4a/0x80 [ 341.146848] [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b [ 341.152855] Mem-Info: [ 341.155124] Node 0 DMA per-cpu: [ 341.158289] CPU 0: hi: 0, btch: 1 usd: 0 [ 341.163074] CPU 1: hi: 0, btch: 1 usd: 0 [ 341.167878] Node 0 DMA32 per-cpu: [ 341.171212] CPU 0: hi: 186, btch: 31 usd: 72 [ 341.176009] CPU 1: hi: 186, btch: 31 usd: 0 [ 341.180794] Active_anon:38344 active_file:6605 inactive_anon:41579 [ 341.180795] inactive_file:4180 unevictable:4 dirty:0 writeback:0 unstable:1 [ 341.180797] free:3147 slab:15867 mapped:8021 pagetables:6295 bounce:0 [ 341.200505] Node 0 DMA free:2028kB min:84kB low:104kB high:124kB active_anon:5284kB inactive_anon:5784kB active_file:644kB inactive_file:612kB unevictable:0kB present:15164kB pages_scanned:0 all_unreclaimable? no [ 341.219339] lowmem_reserve[]: 0 483 483 483 [ 341.223605] Node 0 DMA32 free:10560kB min:2768kB low:3460kB high:4152kB active_anon:148092kB inactive_anon:160532kB active_file:25776kB inactive_file:16108kB unevictable:16kB present:495008kB pages_scanned:618 all_unreclaimable? no [ 341.244093] lowmem_reserve[]: 0 0 0 0 [ 341.247851] Node 0 DMA: 87*4kB 14*8kB 2*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2028kB [ 341.258769] Node 0 DMA32: 2296*4kB 18*8kB 5*16kB 2*32kB 3*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 10560kB [ 341.270121] 59860 total pagecache pages [ 341.273957] 4142 pages in swap cache [ 341.277531] Swap cache stats: add 99071, delete 94929, find 8313/23465 [ 341.284052] Free swap = 780184kB [ 341.287357] Total swap = 1048568kB [ 341.294497] 131072 pages RAM [ 341.297396] 9628 pages reserved [ 341.300538] 126655 pages shared [ 341.303674] 60501 pages non-shared [ 357.833157] Xorg: page allocation failure. order:4, mode:0x40d0 [ 357.839105] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303 [ 357.845243] Call Trace: [ 357.847737] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0 [ 357.854108] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0 [ 357.859965] [<ffffffff810f8608>] __kmalloc+0x198/0x250 [ 357.865263] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 357.872245] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 357.879029] [<ffffffff810ea8bb>] ? swap_info_get+0x6b/0xf0 [ 357.884626] [<ffffffffa00f5b7d>] drm_ioctl+0x12d/0x3d0 [drm] [ 357.890396] [<ffffffffa014be20>] ? i915_gem_execbuffer+0x0/0x11e0 [i915] [ 357.897190] [<ffffffff81271f1a>] ? __up_read+0x2a/0xb0 [ 357.902412] [<ffffffff8110ba8d>] vfs_ioctl+0x7d/0xa0 [ 357.907460] [<ffffffff8110bb3a>] do_vfs_ioctl+0x8a/0x580 [ 357.912873] [<ffffffff8106b236>] ? up_read+0x26/0x30 [ 357.917923] [<ffffffff81544b04>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 357.924289] [<ffffffff8110c07a>] sys_ioctl+0x4a/0x80 [ 357.929347] [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b [ 357.935350] Mem-Info: [ 357.937630] Node 0 DMA per-cpu: [ 357.940801] CPU 0: hi: 0, btch: 1 usd: 0 [ 357.945590] CPU 1: hi: 0, btch: 1 usd: 0 [ 357.950379] Node 0 DMA32 per-cpu: [ 357.953728] CPU 0: hi: 186, btch: 31 usd: 159 [ 357.958513] CPU 1: hi: 186, btch: 31 usd: 0 [ 357.963300] Active_anon:38863 active_file:6095 inactive_anon:41764 [ 357.963301] inactive_file:4777 unevictable:4 dirty:0 writeback:18 unstable:0 [ 357.963302] free:2317 slab:15674 mapped:8121 pagetables:6408 bounce:0 [ 357.983105] Node 0 DMA free:2012kB min:84kB low:104kB high:124kB active_anon:5268kB inactive_anon:5768kB active_file:644kB inactive_file:632kB unevictable:0kB present:15164kB pages_scanned:65 all_unreclaimable? no [ 358.002033] lowmem_reserve[]: 0 483 483 483 [ 358.006331] Node 0 DMA32 free:7380kB min:2768kB low:3460kB high:4152kB active_anon:150124kB inactive_anon:161368kB active_file:23736kB inactive_file:18404kB unevictable:16kB present:495008kB pages_scanned:32 all_unreclaimable? no [ 358.026802] lowmem_reserve[]: 0 0 0 0 [ 358.030561] Node 0 DMA: 81*4kB 11*8kB 0*16kB 0*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2012kB [ 358.041571] Node 0 DMA32: 1534*4kB 29*8kB 3*16kB 4*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 7504kB [ 358.052856] 60223 total pagecache pages [ 358.056690] 4367 pages in swap cache [ 358.060265] Swap cache stats: add 105056, delete 100689, find 9043/26609 [ 358.066954] Free swap = 774800kB [ 358.070268] Total swap = 1048568kB [ 358.077041] 131072 pages RAM [ 358.079954] 9628 pages reserved [ 358.083094] 128803 pages shared [ 358.086237] 61031 pages non-shared [ 507.741934] Xorg: page allocation failure. order:4, mode:0x40d0 [ 507.748019] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303 [ 507.754182] Call Trace: [ 507.756636] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0 [ 507.762988] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0 [ 507.768812] [<ffffffff810f8608>] __kmalloc+0x198/0x250 [ 507.774048] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 507.781010] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 507.787798] [<ffffffff81079ead>] ? trace_hardirqs_on+0xd/0x10 [ 507.793636] [<ffffffff81542b49>] ? mutex_unlock+0x9/0x10 [ 507.799043] [<ffffffffa00f5b7d>] drm_ioctl+0x12d/0x3d0 [drm] [ 507.804788] [<ffffffffa014be20>] ? i915_gem_execbuffer+0x0/0x11e0 [i915] [ 507.811572] [<ffffffff81271f1a>] ? __up_read+0x2a/0xb0 [ 507.816788] [<ffffffff8110ba8d>] vfs_ioctl+0x7d/0xa0 [ 507.821847] [<ffffffff8110bb3a>] do_vfs_ioctl+0x8a/0x580 [ 507.827244] [<ffffffff8106b236>] ? up_read+0x26/0x30 [ 507.832291] [<ffffffff81544b04>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 507.838642] [<ffffffff8110c07a>] sys_ioctl+0x4a/0x80 [ 507.843696] [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b [ 507.849699] Mem-Info: [ 507.851973] Node 0 DMA per-cpu: [ 507.855130] CPU 0: hi: 0, btch: 1 usd: 0 [ 507.859916] CPU 1: hi: 0, btch: 1 usd: 0 [ 507.864700] Node 0 DMA32 per-cpu: [ 507.868036] CPU 0: hi: 186, btch: 31 usd: 0 [ 507.872819] CPU 1: hi: 186, btch: 31 usd: 30 [ 507.876816] Active_anon:34956 active_file:5472 inactive_anon:45220 [ 507.876816] inactive_file:6158 unevictable:4 dirty:13 writeback:2 unstable:0 [ 507.876816] free:1726 slab:15603 mapped:7450 pagetables:6818 bounce:0 [ 507.897413] Node 0 DMA free:2044kB min:84kB low:104kB high:124kB active_anon:5060kB inactive_anon:6028kB active_file:644kB inactive_file:624kB unevictable:0kB present:15164kB pages_scanned:0 all_unreclaimable? no [ 507.916249] lowmem_reserve[]: 0 483 483 483 [ 507.920598] Node 0 DMA32 free:4488kB min:2768kB low:3460kB high:4152kB active_anon:134764kB inactive_anon:174852kB active_file:21244kB inactive_file:24008kB unevictable:16kB present:495008kB pages_scanned:0 all_unreclaimable? no [ 507.940856] lowmem_reserve[]: 0 0 0 0 [ 507.944849] Node 0 DMA: 51*4kB 14*8kB 0*16kB 4*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2044kB [ 507.955772] Node 0 DMA32: 888*4kB 1*8kB 0*16kB 3*32kB 1*64kB 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 4488kB [ 507.966871] 64772 total pagecache pages [ 507.970702] 6574 pages in swap cache [ 507.974276] Swap cache stats: add 161629, delete 155055, find 17122/59120 [ 507.981051] Free swap = 735792kB [ 507.984361] Total swap = 1048568kB [ 507.991453] 131072 pages RAM [ 507.994364] 9628 pages reserved [ 507.997503] 114413 pages shared [ 508.000643] 59801 pages non-shared [ 509.462416] NFS: Server wrote zero bytes, expected 756. [ 580.369464] Xorg: page allocation failure. order:4, mode:0x40d0 [ 580.375400] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303 [ 580.381522] Call Trace: [ 580.384092] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0 [ 580.390669] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0 [ 580.396802] [<ffffffff810f8608>] __kmalloc+0x198/0x250 [ 580.402033] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 580.408992] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915] [ 580.415775] [<ffffffff81079ead>] ? trace_hardirqs_on+0xd/0x10 [ 580.421607] [<ffffffff81542b49>] ? mutex_unlock+0x9/0x10 [ 580.427033] [<ffffffffa00f5b7d>] drm_ioctl+0x12d/0x3d0 [drm] [ 580.432804] [<ffffffffa014be20>] ? i915_gem_execbuffer+0x0/0x11e0 [i915] [ 580.439600] [<ffffffff81271f1a>] ? __up_read+0x2a/0xb0 [ 580.444824] [<ffffffff8110ba8d>] vfs_ioctl+0x7d/0xa0 [ 580.449889] [<ffffffff8110bb3a>] do_vfs_ioctl+0x8a/0x580 [ 580.455287] [<ffffffff8106b236>] ? up_read+0x26/0x30 [ 580.460353] [<ffffffff81544b04>] ? lockdep_sys_exit_thunk+0x35/0x67 [ 580.466702] [<ffffffff8110c07a>] sys_ioctl+0x4a/0x80 [ 580.471751] [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b [ 580.477753] Mem-Info: [ 580.480020] Node 0 DMA per-cpu: [ 580.483189] CPU 0: hi: 0, btch: 1 usd: 0 [ 580.487977] CPU 1: hi: 0, btch: 1 usd: 0 [ 580.492767] Node 0 DMA32 per-cpu: [ 580.496095] CPU 0: hi: 186, btch: 31 usd: 90 [ 580.500892] CPU 1: hi: 186, btch: 31 usd: 1 [ 580.505679] Active_anon:34315 active_file:5739 inactive_anon:45597 [ 580.505681] inactive_file:5830 unevictable:4 dirty:2 writeback:0 unstable:1 [ 580.505682] free:3781 slab:13422 mapped:6830 pagetables:7180 bounce:0 [ 580.525398] Node 0 DMA free:2016kB min:84kB low:104kB high:124kB active_anon:5024kB inactive_anon:6012kB active_file:640kB inactive_file:608kB unevictable:0kB present:15164kB pages_scanned:0 all_unreclaimable? no [ 580.544234] lowmem_reserve[]: 0 483 483 483 [ 580.548504] Node 0 DMA32 free:13108kB min:2768kB low:3460kB high:4152kB active_anon:132236kB inactive_anon:176376kB active_file:22316kB inactive_file:22712kB unevictable:16kB present:495008kB pages_scanned:417 all_unreclaimable? no [ 580.568992] lowmem_reserve[]: 0 0 0 0 [ 580.572741] Node 0 DMA: 56*4kB 22*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2016kB [ 580.583661] Node 0 DMA32: 2995*4kB 23*8kB 1*16kB 1*32kB 4*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 13108kB [ 580.595010] 64782 total pagecache pages [ 580.598845] 6586 pages in swap cache [ 580.602421] Swap cache stats: add 185372, delete 178786, find 19755/72917 [ 580.609205] Free swap = 722720kB [ 580.612513] Total swap = 1048568kB [ 580.619688] 131072 pages RAM [ 580.622586] 9628 pages reserved [ 580.625726] 112220 pages shared [ 580.628868] 58034 pages non-shared Thanks, Fengguang -- 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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