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mm: dirty balancing for tasks

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Based on ideas of Andrew:
  http://marc.info/?l=linux-kernel&m=102912915020543&w=2

Scale the bdi dirty limit inversly with the tasks dirty rate.
This makes heavy writers have a lower dirty limit than the occasional writer.

Andrea proposed something similar:
  http://lwn.net/Articles/152277/

The main disadvantage to his patch is that he uses an unrelated quantity to
measure time, which leaves him with a workload dependant tunable. Other than
that the two approaches appear quite similar.

[akpm@linux-foundation.org: fix warning]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra
2007-10-16 23:25:50 -07:00
committed by Linus Torvalds
parent 04fbfdc14e
commit 3e26c149c3
4 changed files with 62 additions and 1 deletions
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10
kernel/fork.c
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@@ -107,6 +107,7 @@ static struct kmem_cache *mm_cachep;
void free_task(struct task_struct *tsk)
{
prop_local_destroy_single(&tsk->dirties);
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
free_task_struct(tsk);
@@ -163,6 +164,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
{
struct task_struct *tsk;
struct thread_info *ti;
int err;
prepare_to_copy(orig);
@@ -178,6 +180,14 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
*tsk = *orig;
tsk->stack = ti;
err = prop_local_init_single(&tsk->dirties);
if (err) {
free_thread_info(ti);
free_task_struct(tsk);
return NULL;
}
setup_thread_stack(tsk, orig);
#ifdef CONFIG_CC_STACKPROTECTOR