Re: [PATCH] lowmemorykiller: Avoid excessive/redundant calling of LMK

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Please ignore this patch. My extreme bad that I merged commit messages applicable to some very old kernel into this patch. Updating shortly.

On 01/12/2015 09:38 PM, Chintan Pandya wrote:
The global shrinker will invoke lowmem_shrink in a loop.
The loop will be run (total_scan_pages/batch_size) times.
The default batch_size will be 128 which will make
shrinker invoking 100s of times. LMK does meaningful
work only during first 2-3 times and then rest of the
invocations are just CPU cycle waste. Fix that by giving
excessively large batch size so that lowmem_shrink will
be called just once and in the same try LMK does the
needful.

Signed-off-by: Chintan Pandya<cpandya@xxxxxxxxxxxxxx>
---
  drivers/staging/android/lowmemorykiller.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index b545d3d..5bf483f 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -110,7 +110,7 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
  	if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
  		lowmem_print(5, "lowmem_scan %lu, %x, return 0\n",
  			     sc->nr_to_scan, sc->gfp_mask);
-		return 0;
+		return SHRINK_STOP;
  	}

  	selected_oom_score_adj = min_score_adj;
@@ -163,6 +163,9 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
  		set_tsk_thread_flag(selected, TIF_MEMDIE);
  		send_sig(SIGKILL, selected, 0);
  		rem += selected_tasksize;
+	} else {
+		rcu_read_unlock();
+		return SHRINK_STOP;
  	}

  	lowmem_print(4, "lowmem_scan %lu, %x, return %lu\n",


--
Chintan Pandya

QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
member of the Code Aurora Forum, hosted by The Linux Foundation
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