diff options
Diffstat (limited to 'Documentation/vm/balance')
-rw-r--r-- | Documentation/vm/balance | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/vm/balance b/Documentation/vm/balance index bd3d31bc4915..c46e68cf9344 100644 --- a/Documentation/vm/balance +++ b/Documentation/vm/balance | |||
@@ -75,15 +75,15 @@ Page stealing from process memory and shm is done if stealing the page would | |||
75 | alleviate memory pressure on any zone in the page's node that has fallen below | 75 | alleviate memory pressure on any zone in the page's node that has fallen below |
76 | its watermark. | 76 | its watermark. |
77 | 77 | ||
78 | pages_min/pages_low/pages_high/low_on_memory/zone_wake_kswapd: These are | 78 | watemark[WMARK_MIN/WMARK_LOW/WMARK_HIGH]/low_on_memory/zone_wake_kswapd: These |
79 | per-zone fields, used to determine when a zone needs to be balanced. When | 79 | are per-zone fields, used to determine when a zone needs to be balanced. When |
80 | the number of pages falls below pages_min, the hysteric field low_on_memory | 80 | the number of pages falls below watermark[WMARK_MIN], the hysteric field |
81 | gets set. This stays set till the number of free pages becomes pages_high. | 81 | low_on_memory gets set. This stays set till the number of free pages becomes |
82 | When low_on_memory is set, page allocation requests will try to free some | 82 | watermark[WMARK_HIGH]. When low_on_memory is set, page allocation requests will |
83 | pages in the zone (providing GFP_WAIT is set in the request). Orthogonal | 83 | try to free some pages in the zone (providing GFP_WAIT is set in the request). |
84 | to this, is the decision to poke kswapd to free some zone pages. That | 84 | Orthogonal to this, is the decision to poke kswapd to free some zone pages. |
85 | decision is not hysteresis based, and is done when the number of free | 85 | That decision is not hysteresis based, and is done when the number of free |
86 | pages is below pages_low; in which case zone_wake_kswapd is also set. | 86 | pages is below watermark[WMARK_LOW]; in which case zone_wake_kswapd is also set. |
87 | 87 | ||
88 | 88 | ||
89 | (Good) Ideas that I have heard: | 89 | (Good) Ideas that I have heard: |