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66 lines
2.4 KiB
66 lines
2.4 KiB
From 3742e6638bdb7325c6432e2a145ad985ee47d052 Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Mon, 26 Jan 2009 19:13:47 -0800
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Subject: [PATCH 052/134] lowmemorykiller: Only iterate over process list when needed.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: 8bit
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Use NR_ACTIVE plus NR_INACTIVE as a size estimate for our fake cache
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instead the sum of rss. Neither method is accurate.
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Also skip the process scan, if the amount of memory available is above
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the largest threshold set.
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Signed-off-by: Arve Hjønnevåg <arve@android.com>
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---
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drivers/staging/android/lowmemorykiller.c | 35 +++++++++++++++++-----------
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1 files changed, 21 insertions(+), 14 deletions(-)
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--- a/drivers/staging/android/lowmemorykiller.c
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+++ b/drivers/staging/android/lowmemorykiller.c
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@@ -71,23 +71,30 @@ static int lowmem_shrink(int nr_to_scan,
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}
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if(nr_to_scan > 0)
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lowmem_print(3, "lowmem_shrink %d, %x, ofree %d, ma %d\n", nr_to_scan, gfp_mask, other_free, min_adj);
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+ rem = global_page_state(NR_ACTIVE) + global_page_state(NR_INACTIVE);
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+ if (nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) {
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+ lowmem_print(5, "lowmem_shrink %d, %x, return %d\n", nr_to_scan, gfp_mask, rem);
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+ return rem;
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+ }
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+
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read_lock(&tasklist_lock);
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for_each_process(p) {
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- if(p->oomkilladj >= 0 && p->mm) {
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- tasksize = get_mm_rss(p->mm);
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- if(nr_to_scan > 0 && tasksize > 0 && p->oomkilladj >= min_adj) {
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- if(selected == NULL ||
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- p->oomkilladj > selected->oomkilladj ||
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- (p->oomkilladj == selected->oomkilladj &&
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- tasksize > selected_tasksize)) {
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- selected = p;
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- selected_tasksize = tasksize;
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- lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
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- p->pid, p->comm, p->oomkilladj, tasksize);
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- }
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- }
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- rem += tasksize;
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+ if (p->oomkilladj < min_adj || !p->mm)
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+ continue;
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+ tasksize = get_mm_rss(p->mm);
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+ if (tasksize <= 0)
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+ continue;
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+ if (selected) {
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+ if (p->oomkilladj < selected->oomkilladj)
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+ continue;
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+ if (p->oomkilladj == selected->oomkilladj &&
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+ tasksize <= selected_tasksize)
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+ continue;
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}
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+ selected = p;
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+ selected_tasksize = tasksize;
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+ lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
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+ p->pid, p->comm, p->oomkilladj, tasksize);
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}
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if(selected != NULL) {
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lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
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