linux-kernel - [PATCH 3/3] f2fs: assign allocation hint for warm/cold data

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Message-Id: <20170419014520.12536-3-jaegeuk@kernel.org>
Date:   Tue, 18 Apr 2017 18:45:20 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 3/3] f2fs: assign allocation hint for warm/cold data

This patch gives slower device region to warm/cold data area more eagerly.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/gc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index d988c1aaf132..eb1846a80da3 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1028,4 +1028,9 @@ void build_gc_manager(struct f2fs_sb_info *sbi)
 
 	sbi->fggc_threshold = div64_u64((main_count - ovp_count) *
 				BLKS_PER_SEC(sbi), (main_count - resv_count));
+
+	/* give warm/cold data area from slower device */
+	if (sbi->s_ndevs)
+		sbi->last_victim[ALLOC_NEXT] =
+				GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
 }
-- 
2.11.0