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Date: Sat, 31 Jul 2010 13:33:28 -0400 From: Christoph Hellwig <hch@...radead.org> To: Wu Fengguang <fengguang.wu@...el.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org, Rik van Riel <riel@...hat.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Mel Gorman <mel@....ul.ie>, Christoph Hellwig <hch@...radead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Dave Chinner <david@...morbit.com>, Chris Mason <chris.mason@...cle.com>, Nick Piggin <npiggin@...e.de>, Johannes Weiner <hannes@...xchg.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Andrea Arcangeli <aarcange@...hat.com>, Minchan Kim <minchan.kim@...il.com>, Andreas Mohr <andi@...as.de>, Bill Davidsen <davidsen@....com>, Ben Gamari <bgamari.foss@...il.com> Subject: Re: [PATCH] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls On Sun, Aug 01, 2010 at 12:13:58AM +0800, Wu Fengguang wrote: > FYI I did some memory stress test and find there are much more order-1 > (and higher) users than fork(). This means lots of running applications > may stall on direct reclaim. > > Basically all of these slab caches will do high order allocations: It looks much, much worse on my system. Basically all inode structures, and also tons of frequently allocated xfs structures fall into this category, None of them actually anywhere near the size of a page, which makes me wonder why we do such high order allocations: slabinfo - version: 2.1 # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail> nfsd4_stateowners 0 0 424 19 2 : tunables 0 0 0 : slabdata 0 0 0 kvm_vcpu 0 0 10400 3 8 : tunables 0 0 0 : slabdata 0 0 0 kmalloc_dma-512 32 32 512 16 2 : tunables 0 0 0 : slabdata 2 2 0 mqueue_inode_cache 18 18 896 18 4 : tunables 0 0 0 : slabdata 1 1 0 xfs_inode 279008 279008 1024 16 4 : tunables 0 0 0 : slabdata 17438 17438 0 xfs_efi_item 44 44 360 22 2 : tunables 0 0 0 : slabdata 2 2 0 xfs_efd_item 44 44 368 22 2 : tunables 0 0 0 : slabdata 2 2 0 xfs_trans 40 40 800 20 4 : tunables 0 0 0 : slabdata 2 2 0 xfs_da_state 32 32 488 16 2 : tunables 0 0 0 : slabdata 2 2 0 nfs_inode_cache 0 0 1016 16 4 : tunables 0 0 0 : slabdata 0 0 0 isofs_inode_cache 0 0 632 25 4 : tunables 0 0 0 : slabdata 0 0 0 fat_inode_cache 0 0 664 12 2 : tunables 0 0 0 : slabdata 0 0 0 hugetlbfs_inode_cache 14 14 584 14 2 : tunables 0 0 0 : slabdata 1 1 0 ext4_inode_cache 0 0 968 16 4 : tunables 0 0 0 : slabdata 0 0 0 ext2_inode_cache 21 21 776 21 4 : tunables 0 0 0 : slabdata 1 1 0 ext3_inode_cache 0 0 800 20 4 : tunables 0 0 0 : slabdata 0 0 0 rpc_inode_cache 19 19 832 19 4 : tunables 0 0 0 : slabdata 1 1 0 UDP-Lite 0 0 768 21 4 : tunables 0 0 0 : slabdata 0 0 0 ip_dst_cache 170 378 384 21 2 : tunables 0 0 0 : slabdata 18 18 0 RAW 63 63 768 21 4 : tunables 0 0 0 : slabdata 3 3 0 UDP 52 84 768 21 4 : tunables 0 0 0 : slabdata 4 4 0 TCP 60 100 1600 20 8 : tunables 0 0 0 : slabdata 5 5 0 blkdev_queue 42 42 2216 14 8 : tunables 0 0 0 : slabdata 3 3 0 sock_inode_cache 650 713 704 23 4 : tunables 0 0 0 : slabdata 31 31 0 skbuff_fclone_cache 36 36 448 18 2 : tunables 0 0 0 : slabdata 2 2 0 shmem_inode_cache 3620 3948 776 21 4 : tunables 0 0 0 : slabdata 188 188 0 proc_inode_cache 1818 1875 632 25 4 : tunables 0 0 0 : slabdata 75 75 0 bdev_cache 57 57 832 19 4 : tunables 0 0 0 : slabdata 3 3 0 inode_cache 7934 7938 584 14 2 : tunables 0 0 0 : slabdata 567 567 0 files_cache 689 713 704 23 4 : tunables 0 0 0 : slabdata 31 31 0 signal_cache 301 342 896 18 4 : tunables 0 0 0 : slabdata 19 19 0 sighand_cache 192 210 2112 15 8 : tunables 0 0 0 : slabdata 14 14 0 task_struct 311 325 5616 5 8 : tunables 0 0 0 : slabdata 65 65 0 idr_layer_cache 578 585 544 15 2 : tunables 0 0 0 : slabdata 39 39 0 radix_tree_node 74738 74802 560 14 2 : tunables 0 0 0 : slabdata 5343 5343 0 kmalloc-8192 29 32 8192 4 8 : tunables 0 0 0 : slabdata 8 8 0 kmalloc-4096 194 208 4096 8 8 : tunables 0 0 0 : slabdata 26 26 0 kmalloc-2048 310 352 2048 16 8 : tunables 0 0 0 : slabdata 22 22 0 kmalloc-1024 1607 1616 1024 16 4 : tunables 0 0 0 : slabdata 101 101 0 kmalloc-512 484 512 512 16 2 : tunables 0 0 0 : slabdata 32 32 0 -- 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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