Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1231986

[PATCH] zram: keep the exact overcommited value in mem_used_max

Show all headers | View raw

From: Sergey SENOZHATSKY <sergey.senozhatsky@gmail.com>

`mem_used_max' is designed to store the max amount of memory zram
consumed to store the data. However, it does not represent the actual
'overcommited' (max) value. The existing code goes to -ENOMEM
overcommited case before it updates `->stats.max_used_pages', which
hides the reason we went to -ENOMEM in the first place -- we actually
used more memory than `->limit_pages':

        alloced_pages = zs_get_total_pages(meta->mem_pool);
        if (zram->limit_pages && alloced_pages > zram->limit_pages) {
                zs_free(meta->mem_pool, handle);
                ret = -ENOMEM;
                goto out;
        }

        update_used_max(zram, alloced_pages);

Which is misleading. User will see -ENOMEM, check `->limit_pages',
check `->stats.max_used_pages', which will keep the value BEFORE zram
passed `->limit_pages', and see:
	`->stats.max_used_pages' < `->limit_pages'

Move update_used_max() before we do `->limit_pages' check, so that
user will see:
	`->stats.max_used_pages' > `->limit_pages'
should the overcommit and -ENOMEM happen.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
 drivers/block/zram/zram_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index cb478ca..6f04fb2 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -738,14 +738,14 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
 	}
 
 	alloced_pages = zs_get_total_pages(meta->mem_pool);
+	update_used_max(zram, alloced_pages);
+
 	if (zram->limit_pages && alloced_pages > zram->limit_pages) {
 		zs_free(meta->mem_pool, handle);
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	update_used_max(zram, alloced_pages);
-
 	cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_WO);
 
 	if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) {
-- 
2.5.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] zram: keep the exact overcommited value in mem_used_max Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2015-09-24 12:00 +0200
  Re: [PATCH] zram: keep the exact overcommited value in mem_used_max Minchan Kim <minchan@kernel.org> - 2015-09-30 03:30 +0200

csiph-web