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| author | Bron Gondwana <brong@fastmail.fm> | 2008-02-04 22:29:20 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:18 -0800 |
| commit | 195cf453d2c3d789cbe80e3735755f860c2fb222 (patch) | |
| tree | fad48a8167744b6c091c8ca499bc78b859af8957 /fs/proc/base.c | |
| parent | 3dfa5721f12c3d5a441448086bee156887daa961 (diff) | |
| download | lwn-195cf453d2c3d789cbe80e3735755f860c2fb222.tar.gz lwn-195cf453d2c3d789cbe80e3735755f860c2fb222.zip | |
mm/page-writeback: highmem_is_dirtyable option
Add vm.highmem_is_dirtyable toggle
A 32 bit machine with HIGHMEM64 enabled running DCC has an MMAPed file of
approximately 2Gb size which contains a hash format that is written
randomly by the dbclean process. On 2.6.16 this process took a few
minutes. With lowmem only accounting of dirty ratios, this takes about 12
hours of 100% disk IO, all random writes.
Include a toggle in /proc/sys/vm/highmem_is_dirtyable which can be set to 1 to
add the highmem back to the total available memory count.
[akpm@linux-foundation.org: Fix the CONFIG_DETECT_SOFTLOCKUP=y build]
Signed-off-by: Bron Gondwana <brong@fastmail.fm>
Cc: Ethan Solomita <solo@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: WU Fengguang <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/base.c')
0 files changed, 0 insertions, 0 deletions