Re: [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.

On Thu, 8 Nov 2007, Mel Gorman wrote:

> On (06/11/07 17:11), Christoph Lameter didst pronounce:
> > The defrag_ratio is used to set the threshold at which defragmentation
> > should be run on a slabcache.
> > 
> 
> I'm thick, I would like to see a quick note here on what defragmentation
> means. Also, this defrag_ratio seems to have a significantly different
> meaning to the other defrag_ratio which isn't helping my poor head at
> all.

Yes that is why they have different names. The remote_node_defrag ratio 
controls the amount of remote allocs we do to reduce fragmentation.
 
> "The defrag_ratio sets a threshold at which a slab will be vacated of all
> it's objects and the pages freed during memory reclaim."

Sortof. If a slab is beyond the threshold during reclaim then reclaim will 
attempt to free the remaining objects in the slab to reclaim the whole 
slab.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• References:
  • [patch 00/23] Slab defragmentation V6
    • From: Christoph Lameter <[email protected]>
  • [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.
    • From: Christoph Lameter <[email protected]>
  • Re: [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.
    • From: [email protected] (Mel Gorman)

• Prev by Date: Re: Problem with accessing namespace_sem from LSM.
• Next by Date: Re: [patch 12/23] SLUB: Trigger defragmentation from memory reclaim
• Previous by thread: Re: [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.
• Next by thread: [patch 08/23] 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/:0000968 /sys/slab/:0001024 /sys/slab/:0001152 /sys/slab/:0001312 /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/:a-0000128 /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 /s ys/slab/arp_cache /sys/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 /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/jbd_1k /sys/slab/jbd_4k /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/s lab/kmalloc-256 /sys/slab/kmalloc-32 /sys/slab/kmalloc-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/net_namespace /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 /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
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]