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| author |   Paul Menage <menage@google.com> | 2007-07-15 23:40:11 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:43 -0700 |
| commit | c2aef333c98b41eeb0f0d55b7faa7d4625a6160b (patch) | |
| tree | 39917beefd3cddf1c5c2c68894346efe0cc7dff1 /kernel/cpuset.c | |
| parent | RTC: Ratelimit "lost interrupts" message (diff) | |
| download | linux-dev-c2aef333c98b41eeb0f0d55b7faa7d4625a6160b.tar.xz linux-dev-c2aef333c98b41eeb0f0d55b7faa7d4625a6160b.zip | |
Reduce cpuset.c write_lock_irq() to read_lock()
cpuset.c:update_nodemask() uses a write_lock_irq() on tasklist_lock to
block concurrent forks; a read_lock() suffices and is less intrusive.
Signed-off-by: Paul Menage<menage@google.com>
Acked-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cpuset.c')
| -rw-r--r-- | kernel/cpuset.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 4c49188cc49b..824b1c01f410 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -981,10 +981,10 @@ static int update_nodemask(struct cpuset *cs, char *buf) mmarray = kmalloc(ntasks * sizeof(*mmarray), GFP_KERNEL); if (!mmarray) goto done; - write_lock_irq(&tasklist_lock); /* block fork */ + read_lock(&tasklist_lock); /* block fork */ if (atomic_read(&cs->count) <= ntasks) break; /* got enough */ - write_unlock_irq(&tasklist_lock); /* try again */ + read_unlock(&tasklist_lock); /* try again */ kfree(mmarray); } @@ -1006,7 +1006,7 @@ static int update_nodemask(struct cpuset *cs, char *buf) continue; mmarray[n++] = mm; } while_each_thread(g, p); - write_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); /* * Now that we've dropped the tasklist spinlock, we can |