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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-11-07 13:13:42 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-12-23 10:18:07 +0900
commit216fbd64437452d23db54ae845916facd7215caa (patch)
treef69e3387f49964d41e5386287290822c047764e2 /fs/f2fs/segment.h
parent5dcd8a71505186a124640f9f7c5c81fb269cc476 (diff)
downloadlinux-216fbd64437452d23db54ae845916facd7215caa.tar.bz2
f2fs: introduce sysfs entry to control in-place-update policy
This patch introduces new sysfs entries for users to control the policy of in-place-updates, namely IPU, in f2fs. Sometimes f2fs suffers from performance degradation due to its out-of-place update policy that produces many additional node block writes. If the storage performance is very dependant on the amount of data writes instead of IO patterns, we'd better drop this out-of-place update policy. This patch suggests 5 polcies and their triggering conditions as follows. [sysfs entry name = ipu_policy] 0: F2FS_IPU_FORCE all the time, 1: F2FS_IPU_SSR if SSR mode is activated, 2: F2FS_IPU_UTIL if FS utilization is over threashold, 3: F2FS_IPU_SSR_UTIL if SSR mode is activated and FS utilization is over threashold, 4: F2FS_IPU_DISABLE disable IPU. (=default option) [sysfs entry name = min_ipu_util] This parameter controls the threshold to trigger in-place-updates. The number indicates percentage of the filesystem utilization, and used by F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies. For more details, see need_inplace_update() in segment.h. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/segment.h')
-rw-r--r--fs/f2fs/segment.h44
1 files changed, 38 insertions, 6 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index ea563760f4b7..e9a10bdd7fed 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -476,19 +476,51 @@ static inline int utilization(struct f2fs_sb_info *sbi)
/*
* Sometimes f2fs may be better to drop out-of-place update policy.
- * So, if fs utilization is over MIN_IPU_UTIL, then f2fs tries to write
- * data in the original place likewise other traditional file systems.
- * But, currently set 100 in percentage, which means it is disabled.
- * See below need_inplace_update().
+ * And, users can control the policy through sysfs entries.
+ * There are five policies with triggering conditions as follows.
+ * F2FS_IPU_FORCE - all the time,
+ * F2FS_IPU_SSR - if SSR mode is activated,
+ * F2FS_IPU_UTIL - if FS utilization is over threashold,
+ * F2FS_IPU_SSR_UTIL - if SSR mode is activated and FS utilization is over
+ * threashold,
+ * F2FS_IPUT_DISABLE - disable IPU. (=default option)
*/
-#define MIN_IPU_UTIL 100
+#define DEF_MIN_IPU_UTIL 70
+
+enum {
+ F2FS_IPU_FORCE,
+ F2FS_IPU_SSR,
+ F2FS_IPU_UTIL,
+ F2FS_IPU_SSR_UTIL,
+ F2FS_IPU_DISABLE,
+};
+
static inline bool need_inplace_update(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+
+ /* IPU can be done only for the user data */
if (S_ISDIR(inode->i_mode))
return false;
- if (need_SSR(sbi) && utilization(sbi) > MIN_IPU_UTIL)
+
+ switch (SM_I(sbi)->ipu_policy) {
+ case F2FS_IPU_FORCE:
return true;
+ case F2FS_IPU_SSR:
+ if (need_SSR(sbi))
+ return true;
+ break;
+ case F2FS_IPU_UTIL:
+ if (utilization(sbi) > SM_I(sbi)->min_ipu_util)
+ return true;
+ break;
+ case F2FS_IPU_SSR_UTIL:
+ if (need_SSR(sbi) && utilization(sbi) > SM_I(sbi)->min_ipu_util)
+ return true;
+ break;
+ case F2FS_IPU_DISABLE:
+ break;
+ }
return false;
}