On 2014/6/17 0:57, Randy Dunlap wrote: > On 06/16/14 02:25, Xishi Qiu wrote: >> Update the doc. >> >> Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx> >> --- >> Documentation/sysctl/vm.txt | 43 +++++++++++++++++++++++++++++++++++++++++++ >> 1 files changed, 43 insertions(+), 0 deletions(-) >> >> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt >> index dd9d0e3..8008e53 100644 >> --- a/Documentation/sysctl/vm.txt >> +++ b/Documentation/sysctl/vm.txt >> @@ -20,6 +20,10 @@ Currently, these files are in /proc/sys/vm: >> >> - admin_reserve_kbytes >> - block_dump >> +- cache_limit_mbytes >> +- cache_limit_ratio >> +- cache_reclaim_s >> +- cache_reclaim_weight >> - compact_memory >> - dirty_background_bytes >> - dirty_background_ratio >> @@ -97,6 +101,45 @@ information on block I/O debugging is in Documentation/laptops/laptop-mode.txt. >> >> ============================================================== >> >> +cache_limit_mbytes >> + >> +This is used to limit page cache amount. The input unit is MB, value range >> +is from 0 to totalram_pages. If this is set to 0, it will not limit page cache. > > Where does one find the value of totalram_pages? > "cat /proc/meminfo | grep MemTotal" or "free -m" > Is totalram_pages in MB or does totalram_pages need to be divided by some value > to convert it to MB? > Yes, should convert it to MB. Thanks, Xishi Qiu >> +When written to the file, cache_limit_ratio will be updated too. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_limit_ratio >> + >> +This is used to limit page cache amount. The input unit is percent, value >> +range is from 0 to 100. If this is set to 0, it will not limit page cache. >> +When written to the file, cache_limit_mbytes will be updated too. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_reclaim_s >> + >> +This is used to reclaim page cache in circles. The input unit is second, >> +the minimum value is 0. If this is set to 0, it will disable the feature. >> + >> +The default value is 0. >> + >> +============================================================== >> + >> +cache_reclaim_weight >> + >> +This is used to speed up page cache reclaim. It depend on enabling > > depends on > >> +cache_limit_mbytes/cache_limit_ratio or cache_reclaim_s. Value range is >> +from 1(slow) to 100(fast). >> + >> +The default value is 1. >> + >> +============================================================== >> + >> compact_memory >> >> Available only when CONFIG_COMPACTION is set. When 1 is written to the file, >> > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>