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| author | Hong-Mei Li <a21834@motorola.com> | 2013-06-28 19:26:38 +0800 |
|---|---|---|
| committer | Simon Shields <keepcalm444@gmail.com> | 2016-06-13 14:47:39 +1000 |
| commit | 6f04da23b1e3aa60626bfef868ee89a77cebd637 (patch) | |
| tree | 965631521a4d3b9831846da116efda37ddeae69b /fs/proc | |
| parent | 8f5f33a7fd66e85d8d8502b5ee9c1c731ff0aeb5 (diff) | |
| download | kernel_samsung_smdk4412-6f04da23b1e3aa60626bfef868ee89a77cebd637.zip kernel_samsung_smdk4412-6f04da23b1e3aa60626bfef868ee89a77cebd637.tar.gz kernel_samsung_smdk4412-6f04da23b1e3aa60626bfef868ee89a77cebd637.tar.bz2 | |
staging: android: lowmemorykiller: implement task's adj rbtree
Based on the current LMK implementation, LMK has to scan all processes to
select the correct task to kill during low memory.
The basic idea for the optimization is to :
queue all tasks with oom_score_adj priority, and then LMK just selects the
proper task from the queue(rbtree) to kill.
performance improvement:
the current implementation: average time to find a task to kill : 1004us
the optimized implementation: average time to find a task to kill: 43us
Change-Id: I4dbbdd5673314dbbdabb71c3eff0dc229ce4ea91
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/548917
SLT-Approved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: D. Andrei Măceș <dmaces@nd.edu>
Conflicts:
drivers/staging/android/Kconfig
drivers/staging/android/lowmemorykiller.c
fs/proc/base.c
mm/oom_kill.c
Conflicts:
drivers/staging/android/lowmemorykiller.c
mm/oom_kill.c
Conflicts:
mm/oom_kill.c
Conflicts:
drivers/staging/android/lowmemorykiller.c
mm/oom_kill.c
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 1a140ca..56d23e1 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1063,6 +1063,8 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf, else task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; + delete_from_adj_tree(task); + add_2_adj_tree(task); err_sighand: unlock_task_sighand(task, &flags); err_task_lock: @@ -1187,6 +1189,8 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, atomic_dec(&task->mm->oom_disable_count); } task->signal->oom_score_adj = oom_score_adj; + delete_from_adj_tree(task); + add_2_adj_tree(task); if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) task->signal->oom_score_adj_min = oom_score_adj; /* |