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| author |   Hugh Dickins <hugh.dickins@tiscali.co.uk> | 2009-09-21 17:02:14 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:32 -0700 |
| commit | 6e15838425ac855982f10419558649954a0684a3 (patch) | |
| tree | f39e4a9b845e0bdf8f6b222ca718f155437e5b63 /Kbuild | |
| parent | ksm: break cow once unshared (diff) | |
| download | linux-dev-6e15838425ac855982f10419558649954a0684a3.tar.xz linux-dev-6e15838425ac855982f10419558649954a0684a3.zip | |
ksm: keep quiet while list empty
ksm_scan_thread already sleeps in wait_event_interruptible until setting
ksm_run activates it; but if there's nothing on its list to look at, i.e.
nobody has yet said madvise MADV_MERGEABLE, it's a shame to be clocking
up system time and full_scans: ksmd_should_run added to check that too.
And move the mutex_lock out around it: the new counts showed that when
ksm_run is stopped, a little work often got done afterwards, because it
had been read before taking the mutex.
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Acked-by: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Kbuild')
0 files changed, 0 insertions, 0 deletions