[PATCH] nilfs_cleanerd.conf: set min_reclaimable_blocks parameter to 10 percent

[Ryusuke Konishi]

Increase the default value of min_reclaimable_blocks parameter to 10
percent from the original 5 percent for the following reasons:

1) In real environment, the 10 percent threshold looks better than 5
percent to reduce relocation of static data. The ratio of live
blocks in a lump of static data region is typically about 90-99
percent according to the result of "lssu -l".

2) When we set min_reclaimable_blocks to 10 percent, 10 percent of
disk space (excluding 5 percent reserved capacity) will remain
unreclaimed at worst. But, this is acceptable because the default
value of min_clean_segments is 10 percent and
mc_min_reclaimable_blocks (1%) is applied while the ratio of free
space is below 10 percent.

Cc: Andreas Rohner <andreas.rohner-***@public.gmane.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke-***@public.gmane.org>
---
man/nilfs_cleanerd.conf.5 | 2 +-
sbin/cleanerd/cldconfig.h | 2 +-
sbin/cleanerd/nilfs_cleanerd.conf | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/man/nilfs_cleanerd.conf.5 b/man/nilfs_cleanerd.conf.5
index e85fa19..f0366e4 100644
--- a/man/nilfs_cleanerd.conf.5
+++ b/man/nilfs_cleanerd.conf.5
@@ -99,7 +99,7 @@ kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G
a percent sign, it represents the ratio of blocks in a segment.
.PP
The default values of \fBmin_reclaimable_blocks\fP and
-\fBmc_min_reclaimable_blocks\fP are 5 percent and 1 percent respectively.
+\fBmc_min_reclaimable_blocks\fP are 10 percent and 1 percent respectively.
.TP
.B log_priority
Gives the verbosity level that is used when logging messages from
diff --git a/sbin/cleanerd/cldconfig.h b/sbin/cleanerd/cldconfig.h
index 0a598d5..2a0af5f 100644
--- a/sbin/cleanerd/cldconfig.h
+++ b/sbin/cleanerd/cldconfig.h
@@ -128,7 +128,7 @@ struct nilfs_cldconfig {
#define NILFS_CLDCONFIG_USE_MMAP 1
#define NILFS_CLDCONFIG_USE_SET_SUINFO 0
#define NILFS_CLDCONFIG_LOG_PRIORITY LOG_INFO
-#define NILFS_CLDCONFIG_MIN_RECLAIMABLE_BLOCKS 5
+#define NILFS_CLDCONFIG_MIN_RECLAIMABLE_BLOCKS 10
#define NILFS_CLDCONFIG_MIN_RECLAIMABLE_BLOCKS_UNIT NILFS_SIZE_UNIT_PERCENT
#define NILFS_CLDCONFIG_MC_MIN_RECLAIMABLE_BLOCKS 1
#define NILFS_CLDCONFIG_MC_MIN_RECLAIMABLE_BLOCKS_UNIT NILFS_SIZE_UNIT_PERCENT
diff --git a/sbin/cleanerd/nilfs_cleanerd.conf b/sbin/cleanerd/nilfs_cleanerd.conf
index 05cd9d4..569cb09 100644
--- a/sbin/cleanerd/nilfs_cleanerd.conf
+++ b/sbin/cleanerd/nilfs_cleanerd.conf
@@ -53,7 +53,7 @@ retry_interval 60

# Specify the minimum number of reclaimable blocks in a segment
# before it can be cleaned.
-min_reclaimable_blocks 5%
+min_reclaimable_blocks 10%

# Specify the minimum number of reclaimable blocks in a segment
# before it can be cleaned.