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writeback: remove unnecessary wait in throttle_vm_writeout()

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We don't want to introduce pointless delays in throttle_vm_writeout() when
the writeback limits are not yet exceeded, do we?

Cc: Nick Piggin <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Pete Zaitcev <[email protected]>
Cc: Greg KH <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Fengguang Wu 2007-10-16 23:30:45 -07:00 • committed by Linus Torvalds
commit 369f2389e7
1 changed files with 8 additions and 10 deletions
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18
mm/page-writeback.c
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@ -502,16 +502,6 @@ void throttle_vm_writeout(gfp_t gfp_mask)
long background_thresh;
long dirty_thresh;
if ((gfp_mask & (__GFP_FS|__GFP_IO)) != (__GFP_FS|__GFP_IO)) {
/*
* The caller might hold locks which can prevent IO completion
* or progress in the filesystem. So we cannot just sit here
* waiting for IO to complete.
*/
congestion_wait(WRITE, HZ/10);
return;
}
for ( ; ; ) {
get_dirty_limits(&background_thresh, &dirty_thresh, NULL, NULL);
@ -525,6 +515,14 @@ void throttle_vm_writeout(gfp_t gfp_mask)
global_page_state(NR_WRITEBACK) <= dirty_thresh)
break;
congestion_wait(WRITE, HZ/10);
/*
* The caller might hold locks which can prevent IO completion
* or progress in the filesystem. So we cannot just sit here
* waiting for IO to complete.
*/
if ((gfp_mask & (__GFP_FS|__GFP_IO)) != (__GFP_FS|__GFP_IO))
break;
}
}