zram: remove writestall zram_stats member

There is no zsmalloc handle allocation slow path now and writestall is not
possible any longer.  Remove it from zram_stats.

Link: https://lkml.kernel.org/r/20250303022425.285971-8-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 249a936b6aac3799c7bb16bfca1d3e38bbd6f43f..fc9321af3ef45d468163539845715fc6e60b798b 100644 (file)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1437,9 +1437,8 @@ static ssize_t debug_stat_show(struct device *dev,
 
        down_read(&zram->init_lock);
        ret = scnprintf(buf, PAGE_SIZE,
-                       "version: %d\n%8llu %8llu\n",
+                       "version: %d\n0 %8llu\n",
                        version,
-                       (u64)atomic64_read(&zram->stats.writestall),
                        (u64)atomic64_read(&zram->stats.miss_free));
        up_read(&zram->init_lock);
 

diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 7c11f9dab335f947868bfc3b682c0b0a647f30a9..6cee93f9c0d06948401b0c69313f68a5d34678c1 100644 (file)
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -82,7 +82,6 @@ struct zram_stats {
        atomic64_t huge_pages_since;    /* no. of huge pages since zram set up */
        atomic64_t pages_stored;        /* no. of pages currently stored */
        atomic_long_t max_used_pages;   /* no. of maximum pages stored */
-       atomic64_t writestall;          /* no. of write slow paths */
        atomic64_t miss_free;           /* no. of missed free */
 #ifdef CONFIG_ZRAM_WRITEBACK
        atomic64_t bd_count;            /* no. of pages in backing device */