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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
