From b967fa1ba72b5da2b6d9bf95f0b13420a59e0701 Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Tue, 17 Sep 2024 11:09:10 +0900 Subject: [PATCH] zram: do not mark idle slots that cannot be idle ZRAM_SAME slots cannot be post-processed (writeback or recompress) so do not mark them ZRAM_IDLE. Same with ZRAM_WB slots, they cannot be ZRAM_IDLE because they are not in zsmalloc pool anymore. Link: https://lkml.kernel.org/r/20240917021020.883356-6-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Cc: Minchan Kim Signed-off-by: Andrew Morton --- drivers/block/zram/zram_drv.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 42f7195b80cb..41e408661940 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -392,17 +392,28 @@ static void mark_idle(struct zram *zram, ktime_t cutoff) /* * Do not mark ZRAM_UNDER_WB slot as ZRAM_IDLE to close race. * See the comment in writeback_store. + * + * Also do not mark ZRAM_SAME slots as ZRAM_IDLE, because no + * post-processing (recompress, writeback) happens to the + * ZRAM_SAME slot. + * + * And ZRAM_WB slots simply cannot be ZRAM_IDLE. */ zram_slot_lock(zram, index); - if (zram_allocated(zram, index) && - !zram_test_flag(zram, index, ZRAM_UNDER_WB)) { + if (!zram_allocated(zram, index) || + zram_test_flag(zram, index, ZRAM_WB) || + zram_test_flag(zram, index, ZRAM_UNDER_WB) || + zram_test_flag(zram, index, ZRAM_SAME)) { + zram_slot_unlock(zram, index); + continue; + } + #ifdef CONFIG_ZRAM_TRACK_ENTRY_ACTIME - is_idle = !cutoff || ktime_after(cutoff, - zram->table[index].ac_time); + is_idle = !cutoff || + ktime_after(cutoff, zram->table[index].ac_time); #endif - if (is_idle) - zram_set_flag(zram, index, ZRAM_IDLE); - } + if (is_idle) + zram_set_flag(zram, index, ZRAM_IDLE); zram_slot_unlock(zram, index); } } -- 2.25.1