Messages in this thread | | | Date | Mon, 12 Jan 2015 21:44:27 +0530 | From | Chintan Pandya <> | Subject | 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@codeaurora.org> > --- > 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
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