Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a183561567b5446d3362b4839bd4f744f4b2af1e
Commit: a183561567b5446d3362b4839bd4f744f4b2af1e
Parent: 58e2d4ca581167c2a079f4ee02be2f0bc52e8729
Author: Srivatsa Vaddagiri <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 25 21:08:00 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 21:08:00 2008 +0100
sched: introduce a mutex and corresponding API to serialize access to
doms_curarray
doms_cur[] array represents various scheduling domains which are
mutually exclusive. Currently cpusets code can modify this array (by
calling partition_sched_domains()) as a result of user modifying
sched_load_balance flag for various cpusets.
This patch introduces a mutex and corresponding API (only when
CONFIG_FAIR_GROUP_SCHED is defined) which allows a reader to safely read
the doms_cur[] array w/o worrying abt concurrent modifications to the
array.
The fair group scheduler code (introduced in next patch of this series)
makes use of this mutex to walk thr' doms_cur[] array while rebalancing
shares of task groups across cpus.
Signed-off-by: Srivatsa Vaddagiri <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
kernel/sched.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index c915f3e..d9585f1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -185,6 +185,9 @@ static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
*/
static DEFINE_MUTEX(task_group_mutex);
+/* doms_cur_mutex serializes access to doms_cur[] array */
+static DEFINE_MUTEX(doms_cur_mutex);
+
/* Default task group.
* Every task in system belong to this group at bootup.
*/
@@ -234,11 +237,23 @@ static inline void unlock_task_group_list(void)
mutex_unlock(&task_group_mutex);
}
+static inline void lock_doms_cur(void)
+{
+ mutex_lock(&doms_cur_mutex);
+}
+
+static inline void unlock_doms_cur(void)
+{
+ mutex_unlock(&doms_cur_mutex);
+}
+
#else
static inline void set_task_cfs_rq(struct task_struct *p, unsigned int cpu) { }
static inline void lock_task_group_list(void) { }
static inline void unlock_task_group_list(void) { }
+static inline void lock_doms_cur(void) { }
+static inline void unlock_doms_cur(void) { }
#endif /* CONFIG_FAIR_GROUP_SCHED */
@@ -6543,6 +6558,8 @@ void partition_sched_domains(int ndoms_new, cpumask_t
*doms_new)
{
int i, j;
+ lock_doms_cur();
+
/* always unregister in case we don't destroy any domains */
unregister_sched_domain_sysctl();
@@ -6583,6 +6600,8 @@ match2:
ndoms_cur = ndoms_new;
register_sched_domain_sysctl();
+
+ unlock_doms_cur();
}
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-
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