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authorMike Travis <travis@sgi.com>2008-04-04 18:11:08 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:59 +0200
commitb53e921ba1cff8453dc9a87a84052fa12d5b30bd (patch)
tree021cadb6c58543ecccd95b55fc319f249ebf176e /kernel
parentf9a86fcbbb1e5542eabf45c9144ac4b6330861a4 (diff)
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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.c2
-rw-r--r--kernel/rcupreempt.c4
-rw-r--r--kernel/sched.c5
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);
}
/*