Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=232ea4d69d81169453344b7d05203425c88d973b
Commit: 232ea4d69d81169453344b7d05203425c88d973b
Parent: b1a316f6f9c54d668df4304ddf935595501ccb25
Author: Andrew Morton <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 28 20:13:21 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Mar 1 14:53:38 2007 -0800
[PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO
allocations
throttle_vm_writeout() is designed to wait for the dirty levels to subside.
But if the caller holds IO or FS locks, we might be holding up that
writeout.
So change it to take a single nap to give other devices a chance to clean
some
memory, then return.
Cc: Nick Piggin <[EMAIL PROTECTED]>
Cc: OGAWA Hirofumi <[EMAIL PROTECTED]>
Cc: Kumar Gala <[EMAIL PROTECTED]>
Cc: Pete Zaitcev <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/writeback.h | 2 +-
mm/page-writeback.c | 13 +++++++++++--
mm/vmscan.c | 2 +-
3 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index fc35e6b..0c78f7f 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -84,7 +84,7 @@ static inline void wait_on_inode(struct inode *inode)
int wakeup_pdflush(long nr_pages);
void laptop_io_completion(void);
void laptop_sync_completion(void);
-void throttle_vm_writeout(void);
+void throttle_vm_writeout(gfp_t gfp_mask);
/* These are exported to sysctl. */
extern int dirty_background_ratio;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index f7e088f..f469e3c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -296,11 +296,21 @@ void balance_dirty_pages_ratelimited_nr(struct
address_space *mapping,
}
EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);
-void throttle_vm_writeout(void)
+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);
@@ -317,7 +327,6 @@ void throttle_vm_writeout(void)
}
}
-
/*
* writeback at least _min_pages, and keep writing until the amount of dirty
* memory is less than the background threshold, or until we're all clean.
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0655d5f..db023e2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -952,7 +952,7 @@ static unsigned long shrink_zone(int priority, struct zone
*zone,
}
}
- throttle_vm_writeout();
+ throttle_vm_writeout(sc->gfp_mask);
atomic_dec(&zone->reclaim_in_progress);
return nr_reclaimed;
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
