From f501d00144328ca9e0521d159cf80ff5c9d21d77 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= Date: Mon, 11 May 2009 15:45:09 -0700 Subject: [PATCH] Staging: android: lowmemorykiller: Only iterate over process list when needed. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 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 Cc: David Rientjes Cc: San Mehat Signed-off-by: Greg Kroah-Hartman --- drivers/staging/android/lowmemorykiller.c | 35 ++++++++++++++--------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c index 3715d56ca96..b9a2e843e2f 100644 --- a/drivers/staging/android/lowmemorykiller.c +++ b/drivers/staging/android/lowmemorykiller.c @@ -71,23 +71,30 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask) } 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", -- 2.20.1