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mm: Add NR_WRITEBACK_TEMP counter

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Fuse will use temporary buffers to write back dirty data from memory mappings
(normal writes are done synchronously).  This is needed, because there cannot
be any guarantee about the time in which a write will complete.

By using temporary buffers, from the MM's point if view the page is written
back immediately.  If the writeout was due to memory pressure, this
effectively migrates data from a full zone to a less full zone.

This patch adds a new counter (NR_WRITEBACK_TEMP) for the number of pages used
as temporary buffers.

[[email protected]: add vmstat_text for NR_WRITEBACK_TEMP]
Signed-off-by: Miklos Szeredi <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Lee Schermerhorn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Miklos Szeredi 2008-04-30 00:54:38 -07:00 • committed by Linus Torvalds
commit fc3ba692a4
5 changed files with 8 additions and 1 deletions
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3
mm/page-writeback.c
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@ -211,7 +211,8 @@ clip_bdi_dirty_limit(struct backing_dev_info *bdi, long dirty, long *pbdi_dirty)
avail_dirty = dirty -
(global_page_state(NR_FILE_DIRTY) +
global_page_state(NR_WRITEBACK) +
global_page_state(NR_UNSTABLE_NFS));
global_page_state(NR_UNSTABLE_NFS) +
global_page_state(NR_WRITEBACK_TEMP));
if (avail_dirty < 0)
avail_dirty = 0;

1
mm/vmstat.c
View file

@ -612,6 +612,7 @@ static const char * const vmstat_text[] = {
"nr_unstable",
"nr_bounce",
"nr_vmscan_write",
"nr_writeback_temp",
#ifdef CONFIG_NUMA
"numa_hit",