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openwrt-xburst/target/linux/goldfish/patches-2.6.30/0052-lowmemorykiller-Only-iterate-over-process-list-when.patch
juhosg 61a476da4d kernel: upgrade to 2.6.30.8 and refresh patches
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17804 3c298f89-4303-0410-b956-a3cf2f4a3e73
2009-10-01 10:07:32 +00:00

67 lines
2.4 KiB
Diff

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