diff options
| author | Victor Lowther <victor.lowther@gmail.com> | 2008-06-28 23:25:11 -0500 |
|---|---|---|
| committer | Victor Lowther <victor.lowther@gmail.com> | 2010-06-05 13:32:49 -0500 |
| commit | 8aae17379df8772e46b0f28fdb4d3e974f65ad54 (patch) | |
| tree | b59bf79b6b857ae2ebcbad5386ae451f4d6189ae /pm/power.d | |
| parent | 6662c9f80bc8e914e826a009cdf0755d442687c8 (diff) | |
Added some explanatory comments to the power hooks.
Diffstat (limited to 'pm/power.d')
| -rw-r--r-- | pm/power.d/laptop-mode | 3 | ||||
| -rw-r--r-- | pm/power.d/readahead | 4 | ||||
| -rw-r--r-- | pm/power.d/xfs_buffer | 2 |
3 files changed, 9 insertions, 0 deletions
diff --git a/pm/power.d/laptop-mode b/pm/power.d/laptop-mode index 0e35f67..52a8452 100644 --- a/pm/power.d/laptop-mode +++ b/pm/power.d/laptop-mode @@ -5,6 +5,7 @@ VM="/proc/sys/vm" [ -f $VM/laptop_mode -a -f $VM/dirty_ratio ] || exit $NA laptop_mode_ac() { + # disable laptop mode, set vm parameters back to sane defaults echo 0 >$VM/laptop_mode echo 5 >$VM/dirty_background_ratio echo 2999 >$VM/dirty_expire_centisecs @@ -13,6 +14,8 @@ laptop_mode_ac() { } laptop_mode_battery() { + # enable laptop mode, set vm parameters to buffer as many writes as + # possible. echo 1 >$VM/laptop_mode echo 1 >$VM/dirty_background_ratio echo 60000 >$VM/dirty_expire_centisecs diff --git a/pm/power.d/readahead b/pm/power.d/readahead index 4247217..c61ce43 100644 --- a/pm/power.d/readahead +++ b/pm/power.d/readahead @@ -3,6 +3,10 @@ [ -x /sbin/blockdev ] || exit $NA readahead() { + # the intent here is to iterate through all filesystems + # mounted on a local block device. It Works For The Maintainer(tm). + # More sophistication in figuring out what exactly is a local block device + # would be welcome. for dev in $(awk '/^\/dev\// {print $1}'</etc/mtab); do /sbin/blockdev --setfra $1 "$dev" done diff --git a/pm/power.d/xfs_buffer b/pm/power.d/xfs_buffer index 7510e68..ec8a248 100644 --- a/pm/power.d/xfs_buffer +++ b/pm/power.d/xfs_buffer @@ -7,12 +7,14 @@ XFS="/proc/sys/fs/xfs" xfs_ac() { + # don't buffer so much, flush data out regularly. echo 1500 >$XFS/age_buffer_centisecs echo 3000 >$XFS/xfssyncd_centisecs echo 100 >$XFS/xfsbufd_centisecs } xfs_battery() { + # buffer lots echo 60000 >$XFS/age_buffer_centisecs echo 60000 >$XFS/xfssyncd_centisecs echo 3000 >$XFS/xfsbufd_centisecs |