The patch titled
Reduce cpuset.c write_lock_irq() to read_lock()
has been removed from the -mm tree. Its filename was
reduce-cpusetc-write_lock_irq-to-read_lock.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Reduce cpuset.c write_lock_irq() to read_lock()
From: Paul Menage <menage@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN kernel/cpuset.c~reduce-cpusetc-write_lock_irq-to-read_lock kernel/cpuset.c
--- a/kernel/cpuset.c~reduce-cpusetc-write_lock_irq-to-read_lock
+++ a/kernel/cpuset.c
@@ -981,10 +981,10 @@ static int update_nodemask(struct cpuset
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
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
_
Patches currently in -mm which might be from menage@xxxxxxxxxx are
origin.patch
cpuset-zero-malloc-revert-the-old-cpuset-fix.patch
containersv10-basic-container-framework.patch
containersv10-basic-container-framework-fix.patch
containersv10-basic-container-framework-fix-2.patch
containersv10-basic-container-framework-fix-3.patch
containersv10-basic-container-framework-fix-for-bad-lock-balance-in-containers.patch
containersv10-example-cpu-accounting-subsystem.patch
containersv10-example-cpu-accounting-subsystem-fix.patch
containersv10-add-tasks-file-interface.patch
containersv10-add-tasks-file-interface-fix.patch
containersv10-add-tasks-file-interface-fix-2.patch
containersv10-add-fork-exit-hooks.patch
containersv10-add-fork-exit-hooks-fix.patch
containersv10-add-container_clone-interface.patch
containersv10-add-container_clone-interface-fix.patch
containersv10-add-procfs-interface.patch
containersv10-add-procfs-interface-fix.patch
containersv10-make-cpusets-a-client-of-containers.patch
containersv10-make-cpusets-a-client-of-containers-whitespace.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-fix.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-cpuset-zero-malloc-fix-for-new-containers.patch
containersv10-simple-debug-info-subsystem.patch
containersv10-simple-debug-info-subsystem-fix.patch
containersv10-simple-debug-info-subsystem-fix-2.patch
containersv10-support-for-automatic-userspace-release-agents.patch
containersv10-support-for-automatic-userspace-release-agents-whitespace.patch
add-containerstats-v3.patch
add-containerstats-v3-fix.patch
update-getdelays-to-become-containerstats-aware.patch
containers-implement-subsys-post_clone.patch
containers-implement-namespace-tracking-subsystem-v3.patch
-
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