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| author | Mark Brown <broonie@kernel.org> | 2016-07-29 21:38:37 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-07-29 21:38:37 +0100 |
| commit | da9a92f0cde9ce34a930d7edcaef30429e41d14a (patch) | |
| tree | 44095fbc8f83990330437d11c7a9fc699a5e2521 /mm/page-writeback.c | |
| parent | aa6b4960f4571ecc422a13b2490e91f5debb64a1 (diff) | |
| parent | b0ba6b0a5eb2b51037a07dbf5a7470ca804d575c (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index e40c9364582d..fd51ebfc423f 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -359,8 +359,9 @@ static void domain_dirty_limits(struct dirty_throttle_control *dtc) struct dirty_throttle_control *gdtc = mdtc_gdtc(dtc); unsigned long bytes = vm_dirty_bytes; unsigned long bg_bytes = dirty_background_bytes; - unsigned long ratio = vm_dirty_ratio; - unsigned long bg_ratio = dirty_background_ratio; + /* convert ratios to per-PAGE_SIZE for higher precision */ + unsigned long ratio = (vm_dirty_ratio * PAGE_SIZE) / 100; + unsigned long bg_ratio = (dirty_background_ratio * PAGE_SIZE) / 100; unsigned long thresh; unsigned long bg_thresh; struct task_struct *tsk; @@ -372,26 +373,28 @@ static void domain_dirty_limits(struct dirty_throttle_control *dtc) /* * The byte settings can't be applied directly to memcg * domains. Convert them to ratios by scaling against - * globally available memory. + * globally available memory. As the ratios are in + * per-PAGE_SIZE, they can be obtained by dividing bytes by + * number of pages. */ if (bytes) - ratio = min(DIV_ROUND_UP(bytes, PAGE_SIZE) * 100 / - global_avail, 100UL); + ratio = min(DIV_ROUND_UP(bytes, global_avail), + PAGE_SIZE); if (bg_bytes) - bg_ratio = min(DIV_ROUND_UP(bg_bytes, PAGE_SIZE) * 100 / - global_avail, 100UL); + bg_ratio = min(DIV_ROUND_UP(bg_bytes, global_avail), + PAGE_SIZE); bytes = bg_bytes = 0; } if (bytes) thresh = DIV_ROUND_UP(bytes, PAGE_SIZE); else - thresh = (ratio * available_memory) / 100; + thresh = (ratio * available_memory) / PAGE_SIZE; if (bg_bytes) bg_thresh = DIV_ROUND_UP(bg_bytes, PAGE_SIZE); else - bg_thresh = (bg_ratio * available_memory) / 100; + bg_thresh = (bg_ratio * available_memory) / PAGE_SIZE; if (bg_thresh >= thresh) bg_thresh = thresh / 2; |