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[PATCH] temporarily disable swap token on memory pressure

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Some users (hi Zwane) have seen a problem when running a workload that
eats nearly all of physical memory - th system does an OOM kill, even
when there is still a lot of swap free.

The problem appears to be a very big task that is holding the swap
token, and the VM has a very hard time finding any other page in the
system that is swappable.

Instead of ignoring the swap token when sc->priority reaches 0, we could
simply take the swap token away from the memory hog and make sure we
don't give it back to the memory hog for a few seconds.

This patch resolves the problem Zwane ran into.

Signed-off-by: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rik van Riel 2005-11-28 13:44:07 -08:00 • committed by Linus Torvalds
commit f7b7fd8f3e
5 changed files with 34 additions and 23 deletions
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10
mm/thrash.c
View file

@ -57,14 +57,17 @@ void grab_swap_token(void)
/* We have the token. Let others know we still need it. */
if (has_swap_token(current->mm)) {
current->mm->recent_pagein = 1;
if (unlikely(!swap_token_default_timeout))
disable_swap_token();
return;
}
if (time_after(jiffies, swap_token_check)) {
/* Can't get swapout protection if we exceed our RSS limit. */
// if (current->mm->rss > current->mm->rlimit_rss)
// return;
if (!swap_token_default_timeout) {
swap_token_check = jiffies + SWAP_TOKEN_CHECK_INTERVAL;
return;
}
/* ... or if we recently held the token. */
if (time_before(jiffies, current->mm->swap_token_time))
@ -95,6 +98,7 @@ void __put_swap_token(struct mm_struct *mm)
{
spin_lock(&swap_token_lock);
if (likely(mm == swap_token_mm)) {
mm->swap_token_time = jiffies + SWAP_TOKEN_CHECK_INTERVAL;
swap_token_mm = &init_mm;
swap_token_check = jiffies;
}