linux-kernel - [PATCHv2 6/6] zram: show zsmalloc objs_moved stat in mm

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Date:   Thu, 23 Feb 2023 12:04:51 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv2 6/6] zram: show zsmalloc objs_moved stat in mm_stat

Extend zram mm_show with new objs_moved zs_pool_stats.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 Documentation/admin-guide/blockdev/zram.rst | 1 +
 drivers/block/zram/zram_drv.c               | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/blockdev/zram.rst b/Documentation/admin-guide/blockdev/zram.rst
index e4551579cb12..699cdbf27e37 100644
--- a/Documentation/admin-guide/blockdev/zram.rst
+++ b/Documentation/admin-guide/blockdev/zram.rst
@@ -267,6 +267,7 @@ line of text and contains the following stats separated by whitespace:
  pages_compacted  the number of pages freed during compaction
  huge_pages	  the number of incompressible pages
  huge_pages_since the number of incompressible pages since zram set up
+ objs_moved       The number of objects moved during pool compaction
  ================ =============================================================
 
 File /sys/block/zram<id>/bd_stat
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index aa490da3cef2..3194e9254c6f 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1221,7 +1221,7 @@ static ssize_t mm_stat_show(struct device *dev,
 	max_used = atomic_long_read(&zram->stats.max_used_pages);
 
 	ret = scnprintf(buf, PAGE_SIZE,
-			"%8llu %8llu %8llu %8lu %8ld %8llu %8lu %8llu %8llu\n",
+			"%8llu %8llu %8llu %8lu %8ld %8llu %8lu %8llu %8llu %8llu\n",
 			orig_size << PAGE_SHIFT,
 			(u64)atomic64_read(&zram->stats.compr_data_size),
 			mem_used << PAGE_SHIFT,
@@ -1230,7 +1230,8 @@ static ssize_t mm_stat_show(struct device *dev,
 			(u64)atomic64_read(&zram->stats.same_pages),
 			atomic_long_read(&pool_stats.pages_compacted),
 			(u64)atomic64_read(&zram->stats.huge_pages),
-			(u64)atomic64_read(&zram->stats.huge_pages_since));
+			(u64)atomic64_read(&zram->stats.huge_pages_since),
+			(u64)atomic64_read(&pool_stats.objs_moved));
 	up_read(&zram->init_lock);
 
 	return ret;
-- 
2.39.2.637.g21b0678d19-goog