If a lot of write streams are triggered, alloc_page and __free_page are
costly called, resulting in high memory pressure.
In order to avoid that, let's reuse mempool pages for writeback pages.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/crypto.c | 16 ++++------------
1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/fs/f2fs/crypto.c b/fs/f2fs/crypto.c
index 2c7819a..2ceee68 100644
--- a/fs/f2fs/crypto.c
+++ b/fs/f2fs/crypto.c
@@ -408,20 +408,12 @@ struct page *f2fs_encrypt(struct inode *inode,
return (struct page *)ctx;
/* The encryption operation will require a bounce page. */
- ciphertext_page = alloc_page(GFP_NOFS);
+ ciphertext_page = mempool_alloc(f2fs_bounce_page_pool, GFP_NOFS);
if (!ciphertext_page) {
- /*
- * This is a potential bottleneck, but at least we'll have
- * forward progress.
- */
- ciphertext_page = mempool_alloc(f2fs_bounce_page_pool,
- GFP_NOFS);
- if (WARN_ON_ONCE(!ciphertext_page))
- ciphertext_page = mempool_alloc(f2fs_bounce_page_pool,
- GFP_NOFS | __GFP_WAIT);
- ctx->flags &= ~F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL;
- } else {
+ ciphertext_page = alloc_page(GFP_NOFS);
ctx->flags |= F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL;
+ } else {
+ ctx->flags &= ~F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL;
}
ctx->flags |= F2FS_WRITE_PATH_FL;
ctx->w.bounce_page = ciphertext_page;
--
2.1.1
--
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