The patch titled
cpuset: avoid changing cpuset's cpus when -errno returned
has been removed from the -mm tree. Its filename was
cpuset-avoid-changing-cpusets-cpus-when-errno-returned.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpuset: avoid changing cpuset's cpus when -errno returned
From: Li Zefan <lizf@xxxxxxxxxxxxxx>
After the patch:
commit 0b2f630a28d53b5a2082a5275bc3334b10373508
Author: Miao Xie <miaox@xxxxxxxxxxxxxx>
Date: Fri Jul 25 01:47:21 2008 -0700
cpusets: restructure the function update_cpumask() and update_nodemask()
It might happen that 'echo 0 > /cpuset/sub/cpus' returned failure but 'cpus'
has been changed, because cpus was changed before calling heap_init() which
may return -ENOMEM.
This patch restores the orginal behavior.
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Acked-by: Paul Menage <menage@xxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Cc: Miao Xie <miaox@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 37 +++++++++++++++----------------------
1 file changed, 15 insertions(+), 22 deletions(-)
diff -puN kernel/cpuset.c~cpuset-avoid-changing-cpusets-cpus-when-errno-returned kernel/cpuset.c
--- a/kernel/cpuset.c~cpuset-avoid-changing-cpusets-cpus-when-errno-returned
+++ a/kernel/cpuset.c
@@ -843,37 +843,25 @@ static void cpuset_change_cpumask(struct
/**
* update_tasks_cpumask - Update the cpumasks of tasks in the cpuset.
* @cs: the cpuset in which each task's cpus_allowed mask needs to be changed
+ * @heap: if NULL, defer allocating heap memory to cgroup_scan_tasks()
*
* Called with cgroup_mutex held
*
* The cgroup_scan_tasks() function will scan all the tasks in a cgroup,
* calling callback functions for each.
*
- * Return 0 if successful, -errno if not.
+ * No return value. It's guaranteed that cgroup_scan_tasks() always returns 0
+ * if @heap != NULL.
*/
-static int update_tasks_cpumask(struct cpuset *cs)
+static void update_tasks_cpumask(struct cpuset *cs, struct ptr_heap *heap)
{
struct cgroup_scanner scan;
- struct ptr_heap heap;
- int retval;
-
- /*
- * cgroup_scan_tasks() will initialize heap->gt for us.
- * heap_init() is still needed here for we should not change
- * cs->cpus_allowed when heap_init() fails.
- */
- retval = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
- if (retval)
- return retval;
scan.cg = cs->css.cgroup;
scan.test_task = cpuset_test_cpumask;
scan.process_task = cpuset_change_cpumask;
- scan.heap = &heap;
- retval = cgroup_scan_tasks(&scan);
-
- heap_free(&heap);
- return retval;
+ scan.heap = heap;
+ cgroup_scan_tasks(&scan);
}
/**
@@ -883,6 +871,7 @@ static int update_tasks_cpumask(struct c
*/
static int update_cpumask(struct cpuset *cs, const char *buf)
{
+ struct ptr_heap heap;
struct cpuset trialcs;
int retval;
int is_load_balanced;
@@ -917,6 +906,10 @@ static int update_cpumask(struct cpuset
if (cpus_equal(cs->cpus_allowed, trialcs.cpus_allowed))
return 0;
+ retval = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
+ if (retval)
+ return retval;
+
is_load_balanced = is_sched_load_balance(&trialcs);
mutex_lock(&callback_mutex);
@@ -927,9 +920,9 @@ static int update_cpumask(struct cpuset
* Scan tasks in the cpuset, and update the cpumasks of any
* that need an update.
*/
- retval = update_tasks_cpumask(cs);
- if (retval < 0)
- return retval;
+ update_tasks_cpumask(cs, &heap);
+
+ heap_free(&heap);
if (is_load_balanced)
async_rebuild_sched_domains();
@@ -1965,7 +1958,7 @@ static void scan_for_empty_cpusets(const
nodes_empty(cp->mems_allowed))
remove_tasks_in_empty_cpuset(cp);
else {
- update_tasks_cpumask(cp);
+ update_tasks_cpumask(cp, NULL);
update_tasks_nodemask(cp, &oldmems);
}
}
_
Patches currently in -mm which might be from lizf@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info.patch
devcgroup-use-kmemdup.patch
devcgroup-remove-unused-variable.patch
memrlimit-add-memrlimit-controller-documentation.patch
memrlimit-setup-the-memrlimit-controller.patch
memrlimit-setup-the-memrlimit-controller-mm_owner-fix.patch
memrlimit-add-memrlimit-controller-accounting-and-control.patch
memrlimit-add-memrlimit-controller-accounting-and-control-memory-rlimit-enhance-mm_owner_changed-callback-to-deal-with-exited-owner.patch
memrlimit-add-memrlimit-controller-accounting-and-control-mm_owner-fix.patch
memrlimit-add-memrlimit-controller-accounting-and-control-mm_owner-fix-checkpatch-fixes.patch
memrlimit-add-memrlimit-controller-accounting-and-control-memory-rlimit-fix-crash-on-fork.patch
memrlimit-improve-error-handling.patch
memrlimit-improve-error-handling-update.patch
memrlimit-handle-attach_task-failure-add-can_attach-callback.patch
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