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authorBenjamin LaHaise <bcrl@kvack.org>2006-03-23 06:01:08 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 10:38:18 -0500
commitb0e6e962992b76580f4900b166a337bad7c1e81b (patch)
tree0caae9380c729a437e89acd5d5817a285156e26e
parentb73b459f72f746a031d1ef4cc7659b20a1f1acb9 (diff)
[PATCH] reduce size of bio mempools
The biovec default mempool limit of 256 entries results in over 3MB of RAM being permanently pinned, even on systems with only 128MB of RAM. Since mempool tries to allocate from the system pool first, it makes sense to reduce the size of the mempool fallbacks to a more reasonable limit of 1-5 entries -- enough for the system to be able to make progress even under load. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Acked-by: Jens Axboe <axboe@suse.de> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/bio.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 1f3bb501c262..8f1d2e815c96 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1243,11 +1243,11 @@ static int __init init_bio(void)
1243 scale = 4; 1243 scale = 4;
1244 1244
1245 /* 1245 /*
1246 * scale number of entries 1246 * Limit number of entries reserved -- mempools are only used when
1247 * the system is completely unable to allocate memory, so we only
1248 * need enough to make progress.
1247 */ 1249 */
1248 bvec_pool_entries = megabytes * 2; 1250 bvec_pool_entries = 1 + scale;
1249 if (bvec_pool_entries > 256)
1250 bvec_pool_entries = 256;
1251 1251
1252 fs_bio_set = bioset_create(BIO_POOL_SIZE, bvec_pool_entries, scale); 1252 fs_bio_set = bioset_create(BIO_POOL_SIZE, bvec_pool_entries, scale);
1253 if (!fs_bio_set) 1253 if (!fs_bio_set)