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Date: Tue, 03 Apr 2007 19:47:17 +0900
From: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Cc: Bill Davidsen <davidsen@....com>, yumiko.sugita.yf@...achi.com,
masami.hiramatsu.pt@...achi.com, hidehiro.kawai.ez@...achi.com,
yuji.kakutani.uw@...achi.com, soshima@...hat.com, haoki@...hat.com
Subject: [PATCH 2/2] VM throttling: Add vm.dirty_start_writeback_ratio to
sysctl
This patch adds a sysctl variable `vm.dirty_start_writeback_ratio' to
enable users to adjust the writeback starting level of the dirty pages.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
---
Documentation/filesystems/proc.txt | 11 +++++++++--
Documentation/sysctl/vm.txt | 3 ++-
kernel/sysctl.c | 11 +++++++++++
3 files changed, 22 insertions(+), 3 deletions(-)
Index: linux-2.6.21-rc5-mm3-writeback/Documentation/filesystems/proc.txt
===================================================================
--- linux-2.6.21-rc5-mm3-writeback.orig/Documentation/filesystems/proc.txt
+++ linux-2.6.21-rc5-mm3-writeback/Documentation/filesystems/proc.txt
@@ -1170,13 +1170,20 @@ dirty_background_ratio
Contains, as a percentage of total system memory, the number of pages at which
the pdflush background writeback daemon will start writing out dirty data.
-dirty_ratio
------------------
+dirty_writeback_start_ratio
+---------------------------
Contains, as a percentage of total system memory, the number of pages at which
a process which is generating disk writes will itself start writing out dirty
data.
+dirty_ratio
+-----------------
+
+Contains, as a percentage of total system memory, the number of pages at which
+a process which is generating disk writes will be blocked untill the level
+subsides.
+
dirty_writeback_centisecs
-------------------------
Index: linux-2.6.21-rc5-mm3-writeback/Documentation/sysctl/vm.txt
===================================================================
--- linux-2.6.21-rc5-mm3-writeback.orig/Documentation/sysctl/vm.txt
+++ linux-2.6.21-rc5-mm3-writeback/Documentation/sysctl/vm.txt
@@ -19,6 +19,7 @@ Currently, these files are in /proc/sys/
- overcommit_memory
- page-cluster
- dirty_ratio
+- dirty_start_writeback_ratio
- dirty_background_ratio
- dirty_expire_centisecs
- dirty_writeback_centisecs
@@ -40,7 +41,7 @@ Currently, these files are in /proc/sys/
dirty_ratio, dirty_background_ratio, dirty_expire_centisecs,
dirty_writeback_centisecs, vfs_cache_pressure, laptop_mode,
block_dump, swap_token_timeout, drop-caches,
-hugepages_treat_as_movable:
+hugepages_treat_as_movable, dirty_start_writeback_ratio:
See Documentation/filesystems/proc.txt
Index: linux-2.6.21-rc5-mm3-writeback/kernel/sysctl.c
===================================================================
--- linux-2.6.21-rc5-mm3-writeback.orig/kernel/sysctl.c
+++ linux-2.6.21-rc5-mm3-writeback/kernel/sysctl.c
@@ -708,6 +708,17 @@ static ctl_table vm_table[] = {
.extra2 = &one_hundred,
},
{
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "dirty_start_writeback_ratio",
+ .data = &dirty_start_writeback_ratio,
+ .maxlen = sizeof(dirty_start_writeback_ratio),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ .extra2 = &one_hundred,
+ },
+ {
.ctl_name = VM_DIRTY_WB_CS,
.procname = "dirty_writeback_centisecs",
.data = &dirty_writeback_interval,
-
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