From 3b60bc5f65bf62348226bc1dbb1107c894619f46 Mon Sep 17 00:00:00 2001 From: Colin Cross Date: Fri, 3 May 2013 14:57:29 -0700 Subject: lowmemorykiller: make default lowmemorykiller debug message useful lowmemorykiller debug messages are inscrutable and mostly useful for debugging the lowmemorykiller, not explaining why a process was killed. Make the messages more useful by prefixing them with "lowmemorykiller: " and explaining in more readable terms what was killed, who it was killed for, and why it was killed. The messages now look like: [ 76.997631] lowmemorykiller: Killing 'droid.gallery3d' (2172), adj 1000, [ 76.997635] to free 27436kB on behalf of 'kswapd0' (29) because [ 76.997638] cache 122624kB is below limit 122880kB for oom_score_adj 1000 [ 76.997641] Free memory is -53356kB above reserved A negative number for free memory above reserved means some of the reserved memory has been used and is being regenerated by kswapd, which is likely what called the shrinkers. Change-Id: I1fe983381e73e124b90aa5d91cb66e55eaca390f Signed-off-by: Colin Cross --- drivers/staging/android/lowmemorykiller.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) (limited to 'drivers/staging/android') diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c index badc16b6f56..a56e0894f66 100644 --- a/drivers/staging/android/lowmemorykiller.c +++ b/drivers/staging/android/lowmemorykiller.c @@ -73,6 +73,7 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc) int tasksize; int i; short min_score_adj = OOM_SCORE_ADJ_MAX + 1; + int minfree = 0; int selected_tasksize = 0; short selected_oom_score_adj; int array_size = ARRAY_SIZE(lowmem_adj); @@ -85,8 +86,8 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc) if (lowmem_minfree_size < array_size) array_size = lowmem_minfree_size; for (i = 0; i < array_size; i++) { - if (other_free < lowmem_minfree[i] && - other_file < lowmem_minfree[i]) { + minfree = lowmem_minfree[i]; + if (other_free < minfree && other_file < minfree) { min_score_adj = lowmem_adj[i]; break; } @@ -143,13 +144,22 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc) selected = p; selected_tasksize = tasksize; selected_oom_score_adj = oom_score_adj; - lowmem_print(2, "select %d (%s), adj %hd, size %d, to kill\n", - p->pid, p->comm, oom_score_adj, tasksize); + lowmem_print(2, "select '%s' (%d), adj %hd, size %d, to kill\n", + p->comm, p->pid, oom_score_adj, tasksize); } if (selected) { - lowmem_print(1, "send sigkill to %d (%s), adj %hd, size %d\n", - selected->pid, selected->comm, - selected_oom_score_adj, selected_tasksize); + lowmem_print(1, "Killing '%s' (%d), adj %hd,\n" \ + " to free %ldkB on behalf of '%s' (%d) because\n" \ + " cache %ldkB is below limit %ldkB for oom_score_adj %hd\n" \ + " Free memory is %ldkB above reserved\n", + selected->comm, selected->pid, + selected_oom_score_adj, + selected_tasksize * (long)(PAGE_SIZE / 1024), + current->comm, current->pid, + other_file * (long)(PAGE_SIZE / 1024), + minfree * (long)(PAGE_SIZE / 1024), + min_score_adj, + other_free * (long)(PAGE_SIZE / 1024)); lowmem_deathpending_timeout = jiffies + HZ; send_sig(SIGKILL, selected, 0); set_tsk_thread_flag(selected, TIF_MEMDIE); -- cgit v1.2.3