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Date: Wed, 4 May 2022 15:12:43 +0300
From: Alexey Romanov <avromanov@...rdevices.ru>
To: <minchan@...nel.org>, <ngupta@...are.org>,
<senozhatsky@...omium.org>, <linux-block@...r.kernel.org>
CC: <axboe@...omium.org>, <kernel@...rdevices.ru>,
<linux-kernel@...r.kernel.org>, <mnitenko@...il.com>,
Alexey Romanov <avromanov@...rdevices.ru>,
Dmitry Rokosov <ddrokosov@...rdevices.ru>
Subject: [PATCH v4] zram: remove double compression logic
The 2nd trial allocation under per-cpu presumption has been
used to prevent regression of allocation failure. However, it
makes trouble for maintenance without significant benefit.
The slowpath branch is executed extremely rarely: getting
there is problematic. Therefore, we delete this branch.
Signed-off-by: Alexey Romanov <avromanov@...rdevices.ru>
Signed-off-by: Dmitry Rokosov <ddrokosov@...rdevices.ru>
---
drivers/block/zram/zram_drv.c | 42 +++++++++--------------------------
drivers/block/zram/zram_drv.h | 1 -
2 files changed, 10 insertions(+), 33 deletions(-)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index cb253d80d72b..e10066a10dcf 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1147,15 +1147,14 @@ static ssize_t bd_stat_show(struct device *dev,
static ssize_t debug_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int version = 1;
+ int version = 2;
struct zram *zram = dev_to_zram(dev);
ssize_t ret;
down_read(&zram->init_lock);
ret = scnprintf(buf, PAGE_SIZE,
- "version: %d\n%8llu %8llu\n",
+ "version: %d\n%8llu\n",
version,
- (u64)atomic64_read(&zram->stats.writestall),
(u64)atomic64_read(&zram->stats.miss_free));
up_read(&zram->init_lock);
@@ -1373,7 +1372,6 @@ static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
}
kunmap_atomic(mem);
-compress_again:
zstrm = zcomp_stream_get(zram->comp);
src = kmap_atomic(page);
ret = zcomp_compress(zstrm, src, &comp_len);
@@ -1382,39 +1380,20 @@ static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
if (unlikely(ret)) {
zcomp_stream_put(zram->comp);
pr_err("Compression failed! err=%d\n", ret);
- zs_free(zram->mem_pool, handle);
return ret;
}
if (comp_len >= huge_class_size)
comp_len = PAGE_SIZE;
- /*
- * handle allocation has 2 paths:
- * a) fast path is executed with preemption disabled (for
- * per-cpu streams) and has __GFP_DIRECT_RECLAIM bit clear,
- * since we can't sleep;
- * b) slow path enables preemption and attempts to allocate
- * the page with __GFP_DIRECT_RECLAIM bit set. we have to
- * put per-cpu compression stream and, thus, to re-do
- * the compression once handle is allocated.
- *
- * if we have a 'non-null' handle here then we are coming
- * from the slow path and handle has already been allocated.
- */
- if (!handle)
- handle = zs_malloc(zram->mem_pool, comp_len,
- __GFP_KSWAPD_RECLAIM |
- __GFP_NOWARN |
- __GFP_HIGHMEM |
- __GFP_MOVABLE);
- if (!handle) {
+
+ handle = zs_malloc(zram->mem_pool, comp_len,
+ __GFP_KSWAPD_RECLAIM |
+ __GFP_NOWARN |
+ __GFP_HIGHMEM |
+ __GFP_MOVABLE);
+
+ if (unlikely(!handle)) {
zcomp_stream_put(zram->comp);
- atomic64_inc(&zram->stats.writestall);
- handle = zs_malloc(zram->mem_pool, comp_len,
- GFP_NOIO | __GFP_HIGHMEM |
- __GFP_MOVABLE);
- if (handle)
- goto compress_again;
return -ENOMEM;
}
@@ -1975,7 +1954,6 @@ static int zram_add(void)
if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE)
blk_queue_max_write_zeroes_sectors(zram->disk->queue, UINT_MAX);
- blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, zram->disk->queue);
ret = device_add_disk(NULL, zram->disk, zram_disk_groups);
if (ret)
goto out_cleanup_disk;
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 80c3b43b4828..158c91e54850 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -81,7 +81,6 @@ 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 */
--
2.30.1
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