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 <[EMAIL PROTECTED]> --- 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, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/