From: Christoph Lameter <clameter@sgi.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
Mel Gorman <mel@skynet.ie>
Subject: Re: [patch 06/17] SLUB: Slab defrag core
Date: Wed, 14 Nov 2007 17:28:24 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0711141726160.22161@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20071115101324.3c00e47d.kamezawa.hiroyu@jp.fujitsu.com>
On Thu, 15 Nov 2007, KAMEZAWA Hiroyuki wrote:
> > from the partial list. So there could be a double effect.
> >
>
> I think shrink_slab()? is called under memory shortage and "re-allocation and
> move" may require to allocate new page. Then, kick() should use GFP_ATOMIC if
> they want to do reallocation. Right ?
There is no reason for allocating a new page. We are talking about slab
allocations. The defrag stuff is run when there is a high degree of
fragmentation. So there are a lot of partially allocated pages around. The
allocation will grab a free object out of one of them.
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next prev parent reply other threads:[~2007-11-15 1:28 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-14 22:09 [patch 00/17] Slab defragmentation V7 Christoph Lameter
2007-11-14 22:09 ` [patch 01/17] SLUB: Extend slabinfo to support -D and -C options Christoph Lameter
2007-11-14 22:09 ` [patch 02/17] SLUB: Add defrag_ratio field and sysfs support Christoph Lameter
2007-11-14 22:09 ` [patch 03/17] SLUB: Replace ctor field with ops field in /sys/slab/:0000008 /sys/slab/:0000016 /sys/slab/:0000024 /sys/slab/:0000032 /sys/slab/:0000040 /sys/slab/:0000048 /sys/slab/:0000056 /sys/slab/:0000064 /sys/slab/:0000072 /sys/slab/:0000080 /sys/slab/:0000088 /sys/slab/:0000096 /sys/slab/:0000104 /sys/slab/:0000128 /sys/slab/:0000144 /sys/slab/:0000184 /sys/slab/:0000192 /sys/slab/:0000216 /sys/slab/:0000256 /sys/slab/:0000344 /sys/slab/:0000384 /sys/slab/:0000448 /sys/slab/:0000512 /sys/slab/:0000768 /sys/slab/:0000976 /sys/slab/:0001024 /sys/slab/:0001152 /sys/slab/:0001328 /sys/slab/:0001536 /sys/slab/:0002048 /sys/slab/:0003072 /sys/slab/:0004096 /sys/slab/:a-0000016 /sys/slab/:a-0000024 /sys/slab/:a-0000056 /sys/slab/:a-0000080 /sys/slab/Acpi-Namespace /sys/slab/Acpi-Operand /sys/slab/Acpi-Parse /sys/slab/Acpi-ParseExt /sys/slab/Acpi-State /sys/slab/RAW /sys/slab/TCP /sys/slab/UDP /sys/slab/UDP-Lite /sys/slab/UNIX /sys/slab/anon_vma /sys/slab/arp_cache /sy s/slab/bdev_cache /sys/slab/bio /sys/slab/biovec-1 /sys/slab/biovec-128 /sys/slab/biovec-16 /sys/slab/biovec-256 /sys/slab/biovec-4 /sys/slab/biovec-64 /sys/slab/blkdev_ioc /sys/slab/blkdev_queue /sys/slab/blkdev_requests /sys/slab/buffer_head /sys/slab/cfq_io_context /sys/slab/cfq_queue /sys/slab/dentry_cache /sys/slab/eventpoll_epi /sys/slab/eventpoll_pwq /sys/slab/ext2_inode_cache /sys/slab/ext3_inode_cache /sys/slab/fasync_cache /sys/slab/file_lock_cache /sys/slab/files_cache /sys/slab/filp /sys/slab/flow_cache /sys/slab/fs_cache /sys/slab/idr_layer_cache /sys/slab/inet_peer_cache /sys/slab/inode_cache /sys/slab/inotify_event_cache /sys/slab/inotify_watch_cache /sys/slab/ip_dst_cache /sys/slab/ip_fib_alias /sys/slab/ip_fib_hash /sys/slab/journal_handle /sys/slab/journal_head /sys/slab/kiocb /sys/slab/kioctx /sys/slab/kmalloc-1024 /sys/slab/kmalloc-128 /sys/slab/kmalloc-16 /sys/slab/kmalloc-192 /sys/slab/kmalloc-2048 /sys/slab/kmalloc-256 /sys/slab/kmalloc-32 /sys/slab/km alloc-512 /sys/slab/kmalloc-64 /sys/slab/kmalloc-8 /sys/slab/kmalloc-96 /sys/slab/mm_struct /sys/slab/mnt_cache /sys/slab/mqueue_inode_cache /sys/slab/names_cache /sys/slab/nfs_direct_cache /sys/slab/nfs_inode_cache /sys/slab/nfs_page /sys/slab/nfs_read_data /sys/slab/nfs_write_data /sys/slab/nfsd4_delegations /sys/slab/nfsd4_files /sys/slab/nfsd4_stateids /sys/slab/nfsd4_stateowners /sys/slab/nsproxy /sys/slab/pid_1 /sys/slab/pid_namespace /sys/slab/posix_timers_cache /sys/slab/proc_inode_cache /sys/slab/radix_tree_node /sys/slab/request_sock_TCP /sys/slab/revoke_record /sys/slab/revoke_table /sys/slab/rpc_buffers /sys/slab/rpc_inode_cache /sys/slab/rpc_tasks /sys/slab/scsi_cmd_cache /sys/slab/scsi_io_context /sys/slab/secpath_cache /sys/slab/sgpool-128 /sys/slab/sgpool-16 /sys/slab/sgpool-32 /sys/slab/sgpool-64 /sys/slab/sgpool-8 /sys/slab/shmem_inode_cache /sys/slab/sighand_cache /sys/slab/signal_cache /sys/slab/sigqueue /sys/slab/skbuff_fclone_cache /sys/slab/skbuff_head _cache /sys/slab/sock_inode_cache /sys/slab/sysfs_dir_cache /sys/slab/task_struct /sys/slab/tcp_bind_bucket /sys/slab/tw_sock_TCP /sys/slab/uhci_urb_priv /sys/slab/uid_cache /sys/slab/vm_area_struct /sys/slab/xfrm_dst_cache Christoph Lameter
2007-11-14 22:09 ` [patch 04/17] SLUB: Add get() and kick() methods Christoph Lameter
2007-11-14 22:09 ` [patch 05/17] SLUB: Sort slab cache list and establish maximum objects for defrag slabs Christoph Lameter
2007-11-14 22:09 ` [patch 06/17] SLUB: Slab defrag core Christoph Lameter
2007-11-15 1:13 ` KAMEZAWA Hiroyuki
2007-11-15 1:28 ` Christoph Lameter [this message]
2007-11-15 2:30 ` KAMEZAWA Hiroyuki
2007-11-15 3:59 ` Christoph Lameter
2007-11-14 22:09 ` [patch 07/17] SLUB: Trigger defragmentation from memory reclaim Christoph Lameter
2007-11-14 22:09 ` [patch 08/17] Buffer heads: Support slab defrag Christoph Lameter
2007-11-14 22:09 ` [patch 09/17] inodes: Support generic defragmentation Christoph Lameter
2007-11-14 22:09 ` [patch 10/17] FS: ExtX filesystem defrag Christoph Lameter
2007-11-14 22:09 ` [patch 11/17] FS: XFS slab defragmentation Christoph Lameter
2007-11-14 22:09 ` [patch 12/17] FS: Proc filesystem support for slab defrag Christoph Lameter
2007-11-14 22:09 ` [patch 13/17] FS: Slab defrag: Reiserfs support Christoph Lameter
2007-11-14 22:09 ` [patch 14/17] FS: Socket inode defragmentation Christoph Lameter
2007-11-14 22:09 ` [patch 15/17] dentries: Add constructor Christoph Lameter
2007-11-14 22:09 ` [patch 16/17] dentries: dentry defragmentation Christoph Lameter
2007-11-14 22:09 ` [patch 17/17] SLUB: Add KICKABLE to avoid repeated kick() attempts Christoph Lameter
-- strict thread matches above, loose matches on Subject: below --
2007-11-28 22:31 [patch 00/17] Slab Fragmentation Reduction V8 Christoph Lameter
2007-11-28 22:31 ` [patch 06/17] SLUB: Slab defrag core Christoph Lameter
2008-02-16 0:45 [patch 00/17] Slab Fragmentation Reduction V10 Christoph Lameter
2008-02-16 0:45 ` [patch 06/17] SLUB: Slab defrag core Christoph Lameter
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