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Date: Mon, 18 Mar 2013 14:51:43 +0900 From: Jaegeuk Kim <jaegeuk.kim@...sung.com> To: unlisted-recipients:; (no To-header on input) Cc: Jaegeuk Kim <jaegeuk.kim@...sung.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net Subject: [PATCH 12/19] f2fs: scan next nat page to reuse free nids in there When we build new free nids, let's scan the just next NAT page instead of skipping a couple of previously scanned pages in order to reuse free nids in there. Otherwise, we can use too much wide range of nids even though several nids were deallocated, and also their node pages can be cached in the node_inode's address space. This means that we can retain lots of clean pages in the main memory, which induces mm's reclaiming overhead. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com> --- fs/f2fs/node.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 90221cc..94951d9 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1317,7 +1317,8 @@ static void build_free_nids(struct f2fs_sb_info *sbi) break; } - nm_i->next_scan_nid = nid; + /* go to the next nat page in order to reuse free nids first */ + nm_i->next_scan_nid = nm_i->init_scan_nid + NAT_ENTRY_PER_BLOCK; /* find free nids from current sum_pages */ mutex_lock(&curseg->curseg_mutex); -- 1.8.1.3.566.gaa39828 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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