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[PATCH] Zone reclaim: resurrect may_swap 

Zone reclaim has a huge impact on NUMA performance (f.e.  our maximum
throughput with XFS is raised from 4GB to 6GB/sec / page cache contamination
of numa nodes destroys locality if one just does a large copy operation which
results in performance dropping for good until reboot).

This patch:

Resurrect may_swap in struct scan_control

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-01-18 17:42:30 -08:00 committed by Linus Torvalds
parent fc30128963
commit f1fd1067ec
1 changed files with 7 additions and 0 deletions
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7
mm/vmscan.c
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@ -71,6 +71,9 @@ struct scan_control {
int may_writepage;
/* Can pages be swapped as part of reclaim? */
int may_swap;
/* This context's SWAP_CLUSTER_MAX. If freeing memory for
* suspend, we effectively ignore SWAP_CLUSTER_MAX.
* In this context, it doesn't matter that we scan the
@ -458,6 +461,8 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
* Try to allocate it some swap space here.
*/
if (PageAnon(page) && !PageSwapCache(page)) {
if (!sc->may_swap)
goto keep_locked;
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
}
@ -1166,6 +1171,7 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
sc.gfp_mask = gfp_mask;
sc.may_writepage = 0;
sc.may_swap = 1;
inc_page_state(allocstall);
@ -1268,6 +1274,7 @@ loop_again:
total_reclaimed = 0;
sc.gfp_mask = GFP_KERNEL;
sc.may_writepage = 0;
sc.may_swap = 1;
sc.nr_mapped = read_page_state(nr_mapped);
inc_page_state(pageoutrun);