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authorChristoph Lameter <christoph@lameter.com>2005-06-24 23:13:50 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 17:10:13 -0700
commit3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73 (patch)
treed1e7c1e2e8902072042aefc3a7976b271cf76021 /mm
parentb3e112bcc19abd8e9657dca34a87316786e096f3 (diff)
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[PATCH] Cleanup patch for process freezing
1. Establish a simple API for process freezing defined in linux/include/sched.h: frozen(process) Check for frozen process freezing(process) Check if a process is being frozen freeze(process) Tell a process to freeze (go to refrigerator) thaw_process(process) Restart process frozen_process(process) Process is frozen now 2. Remove all references to PF_FREEZE and PF_FROZEN from all kernel sources except sched.h 3. Fix numerous locations where try_to_freeze is manually done by a driver 4. Remove the argument that is no longer necessary from two function calls. 5. Some whitespace cleanup 6. Clear potential race in refrigerator (provides an open window of PF_FREEZE cleared before setting PF_FROZEN, recalc_sigpending does not check PF_FROZEN). This patch does not address the problem of freeze_processes() violating the rule that a task may only modify its own flags by setting PF_FREEZE. This is not clean in an SMP environment. freeze(process) is therefore not SMP safe! Signed-off-by: Christoph Lameter <christoph@lameter.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/pdflush.c2
-rw-r--r--mm/vmscan.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/mm/pdflush.c b/mm/pdflush.c
index 38ce279cc8c..d6781951267 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -105,7 +105,7 @@ static int __pdflush(struct pdflush_work *my_work)
spin_unlock_irq(&pdflush_lock);
schedule();
- if (try_to_freeze(PF_FREEZE)) {
+ if (try_to_freeze()) {
spin_lock_irq(&pdflush_lock);
continue;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4b8e62a1937..1fa312a8db7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1216,8 +1216,8 @@ static int kswapd(void *p)
order = 0;
for ( ; ; ) {
unsigned long new_order;
- if (current->flags & PF_FREEZE)
- refrigerator(PF_FREEZE);
+
+ try_to_freeze();
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
new_order = pgdat->kswapd_max_order;