Subject: [merged] zram-delay-pending-free-request-in-read-path.patch removed from -mm tree
To: minchan@xxxxxxxxxx,jmarchan@xxxxxxxxxx,ngupta@xxxxxxxxxx,sergey.senozhatsky@xxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 31 Jan 2014 11:16:23 -0800
The patch titled
Subject: zram: delay pending free request in read path
has been removed from the -mm tree. Its filename was
zram-delay-pending-free-request-in-read-path.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zram: delay pending free request in read path
Sergey reported we don't need to handle pending free request every I/O so
that this patch removes it in read path while we remain it in write path.
Let's consider below example.
Swap subsystem ask to zram "A" block free by swap_slot_free_notify but
zram had been pended it without real freeing. Swap subsystem allocates
"A" block for new data but request pended for a long time just handled and
zram blindly free new data on the "A" block. :(
That's why we couldn't remove handle pending free request right before
zram-write.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reported-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Jerome Marchand <jmarchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 1 -
1 file changed, 1 deletion(-)
diff -puN drivers/block/zram/zram_drv.c~zram-delay-pending-free-request-in-read-path drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-delay-pending-free-request-in-read-path
+++ a/drivers/block/zram/zram_drv.c
@@ -535,7 +535,6 @@ static int zram_bvec_rw(struct zram *zra
if (rw == READ) {
down_read(&zram->lock);
- handle_pending_slot_free(zram);
ret = zram_bvec_read(zram, bvec, index, offset, bio);
up_read(&zram->lock);
} else {
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
origin.patch
mm-remove-bug_on-from-mlock_vma_page.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead.patch
debugging-keep-track-of-page-owners.patch
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