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| author | Christoph Lameter <clameter@sgi.com> | 2006-01-18 17:42:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-18 19:20:17 -0800 |
| commit | f1fd1067ece574ab56e4a70878b9a5a1ed4c3c42 (patch) | |
| tree | f7f9d092ac0ed8bd734245d803b563b5e751c8ad /mm/vmscan.c | |
| parent | fc3012896337c83a056c496d7cfb0072e1591181 (diff) | |
| download | lwn-f1fd1067ece574ab56e4a70878b9a5a1ed4c3c42.tar.gz lwn-f1fd1067ece574ab56e4a70878b9a5a1ed4c3c42.zip | |
[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>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 827bf674577a..e5117b6897a9 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -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); |