diff options
| author | Mike Travis <travis@sgi.com> | 2008-04-04 18:11:08 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-19 19:44:59 +0200 |
| commit | b53e921ba1cff8453dc9a87a84052fa12d5b30bd (patch) | |
| tree | 021cadb6c58543ecccd95b55fc319f249ebf176e /kernel | |
| parent | f9a86fcbbb1e5542eabf45c9144ac4b6330861a4 (diff) | |
| download | lwn-b53e921ba1cff8453dc9a87a84052fa12d5b30bd.tar.gz lwn-b53e921ba1cff8453dc9a87a84052fa12d5b30bd.zip | |
generic: reduce stack pressure in sched_affinity
* Modify sched_affinity functions to pass cpumask_t variables by reference
instead of by value.
* Use new set_cpus_allowed_ptr function.
Depends on:
[sched-devel]: sched: add new set_cpus_allowed_ptr function
Cc: Paul Jackson <pj@sgi.com>
Cc: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/compat.c | 2 | ||||
| -rw-r--r-- | kernel/rcupreempt.c | 4 | ||||
| -rw-r--r-- | kernel/sched.c | 5 |
3 files changed, 6 insertions, 5 deletions
diff --git a/kernel/compat.c b/kernel/compat.c index 9c48abfcd4a5..e1ef04870c2a 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -445,7 +445,7 @@ asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, if (retval) return retval; - return sched_setaffinity(pid, new_mask); + return sched_setaffinity(pid, &new_mask); } asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c index e9517014b57c..e1cdf196a515 100644 --- a/kernel/rcupreempt.c +++ b/kernel/rcupreempt.c @@ -1007,10 +1007,10 @@ void __synchronize_sched(void) if (sched_getaffinity(0, &oldmask) < 0) oldmask = cpu_possible_map; for_each_online_cpu(cpu) { - sched_setaffinity(0, cpumask_of_cpu(cpu)); + sched_setaffinity(0, &cpumask_of_cpu(cpu)); schedule(); } - sched_setaffinity(0, oldmask); + sched_setaffinity(0, &oldmask); } EXPORT_SYMBOL_GPL(__synchronize_sched); diff --git a/kernel/sched.c b/kernel/sched.c index ccc23a9cd264..1a8252385c4d 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4908,9 +4908,10 @@ out_unlock: return retval; } -long sched_setaffinity(pid_t pid, cpumask_t new_mask) +long sched_setaffinity(pid_t pid, const cpumask_t *in_mask) { cpumask_t cpus_allowed; + cpumask_t new_mask = *in_mask; struct task_struct *p; int retval; @@ -4991,7 +4992,7 @@ asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len, if (retval) return retval; - return sched_setaffinity(pid, new_mask); + return sched_setaffinity(pid, &new_mask); } /* |