[0/3] zram: queue flag nowait and mior cleanup

Message ID	20230512082958.6550-1-kch@nvidia.com (mailing list archive)
Headers	show Return-Path: <linux-block-owner@vger.kernel.org> Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C From: Chaitanya Kulkarni <kch@nvidia.com> To: <minchan@kernel.org>, <senozhatsky@chromium.org> CC: <axboe@kernel.dk>, <linux-block@vger.kernel.org>, Chaitanya Kulkarni <kch@nvidia.com> Subject: [PATCH 0/3] zram: queue flag nowait and mior cleanup Date: Fri, 12 May 2023 01:29:55 -0700 Message-ID: <20230512082958.6550-1-kch@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Precedence: bulk
Series	zram: queue flag nowait and mior cleanup \| expand [0/3] zram: queue flag nowait and mior cleanup [1/3] zram: allow user to set QUEUE_FLAG_NOWAIT [2/3] zram: consolidate zram_bio_read()_zram_bio_write() [3/3] zram: add flush_dcache_page() call for write

Hi Minchan/Sergey, Consolidate the zram_bvec_read() and zram_bvec_write() into one function, add missing flush_dcache_page() before zram_bvec_write(), and allow user to set the QUEUE_FLAG_NOWAIT to get the better performance with io_uring:- * linux-block (for-next) # grep IOPS zram*fio | column -t default-nowait-off-1.fio: read: IOPS=792k, BW=3095MiB/s default-nowait-off-2.fio: read: IOPS=812k, BW=3173MiB/s default-nowait-off-3.fio: read: IOPS=803k, BW=3137MiB/s nowait-on-1.fio: read: IOPS=864k, BW=3374MiB/s nowait-on-2.fio: read: IOPS=863k, BW=3371MiB/s nowait-on-3.fio: read: IOPS=864k, BW=3374MiB/s * linux-block (for-next) # grep cpu zram*fio | column -t default-nowait-off-1.fio: cpu : usr=5.92%, sys=13.05%, ctx=37784503 default-nowait-off-2.fio: cpu : usr=6.07%, sys=13.66%, ctx=37821095 default-nowait-off-3.fio: cpu : usr=6.06%, sys=13.33%, ctx=38395321 nowait-on-1.fio: cpu : usr=1.78%, sys=97.58%, ctx=23848, nowait-on-2.fio: cpu : usr=1.78%, sys=97.61%, ctx=22537, nowait-on-3.fio: cpu : usr=1.80%, sys=97.60%, ctx=21582, * linux-block (for-next) # grep slat zram*fio | column -t default-nowait-off-1.fio: slat (nsec): min=410, max=4827.1k, avg=1868.3 default-nowait-off-2.fio: slat (nsec): min=411, max=5335.4k, avg=1953.2 default-nowait-off-3.fio: slat (nsec): min=420, max=5102.4k, avg=1852.9 nowait-on-1.fio: slat (nsec): min=1072,max=33725k, avg=54834.7 nowait-on-2.fio: slat (nsec): min=972, max=16048k, avg=54874.8 nowait-on-3.fio: slat (nsec): min=1042,max=7085.1k, avg=54823.7 Please let me know if further testing is needed I've ran fio verification job in order to make verify these changes. -ck Chaitanya Kulkarni (3): zram: allow user to set QUEUE_FLAG_NOWAIT zram: consolidate zram_bio_read()_zram_bio_write() zram: add flush_dcache_page() call for write drivers/block/zram/zram_drv.c | 63 +++++++++++++++-------------------- 1 file changed, 27 insertions(+), 36 deletions(-) oinux-block (for-next) # sh test-zram-nowait.sh + git log -4 commit f6654c00ddea9b02952ac94551e0d7469fc8e8d8 (HEAD -> for-next) Author: Chaitanya Kulkarni <kch@nvidia.com> Date: Thu May 11 23:50:37 2023 -0700 zram: add flush_dcache_page() call for write Just like we have a call flush_dcache_read() after zrma_bvec_read, add missing flush_dcache_page() call before zram_bdev_write() in order to handle the cache congruency of the kernel and userspace mappings of page when zram does write. Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com> commit bfe3e67f81284663bf84bc5121c27bf90410d433 Author: Chaitanya Kulkarni <kch@nvidia.com> Date: Thu May 11 23:46:43 2023 -0700 zram: consolidate zram_bio_read()_zram_bio_write() zram_bio_read() and zram_bio_write() are 26 lines rach and share most of the code except call to zram_bdev_read() and zram_bvec_write() calls. Consolidate code into single zram_bio_rw() to remove the duplicate code and an extra function that is only needed for 2 lines of code :- 1c1 < static void zram_bio_read(struct zram *zram, struct bio *bio) commit 6f5b4f6dec19464158ead387739ceb72b97e991c Author: Chaitanya Kulkarni <kch@nvidia.com> Date: Thu May 11 23:03:32 2023 -0700 zram: allow user to set QUEUE_FLAG_NOWAIT Allow user to set the QUEUE_FLAG_NOWAIT optionally using module parameter to retain the default behaviour. Also, update respective allocation flags in the write path. Following are the performance numbers with io_uring fio engine for random read, note that device has been populated fully with randwrite workload before taking these numbers :- * linux-block (for-next) # grep IOPS zram*fio | column -t default-nowait-off-1.fio: read: IOPS=792k, BW=3095MiB/s default-nowait-off-2.fio: read: IOPS=812k, BW=3173MiB/s default-nowait-off-3.fio: read: IOPS=803k, BW=3137MiB/s nowait-on-1.fio: read: IOPS=864k, BW=3374MiB/s nowait-on-2.fio: read: IOPS=863k, BW=3371MiB/s nowait-on-3.fio: read: IOPS=864k, BW=3374MiB/s * linux-block (for-next) # grep cpu zram*fio | column -t default-nowait-off-1.fio: cpu : usr=5.92%, sys=13.05%, ctx=37784503 default-nowait-off-2.fio: cpu : usr=6.07%, sys=13.66%, ctx=37821095 default-nowait-off-3.fio: cpu : usr=6.06%, sys=13.33%, ctx=38395321 nowait-on-1.fio: cpu : usr=1.78%, sys=97.58%, ctx=23848, nowait-on-2.fio: cpu : usr=1.78%, sys=97.61%, ctx=22537, nowait-on-3.fio: cpu : usr=1.80%, sys=97.60%, ctx=21582, * linux-block (for-next) # grep slat zram*fio | column -t default-nowait-off-1.fio: slat (nsec): min=410, max=4827.1k, avg=1868.3 default-nowait-off-2.fio: slat (nsec): min=411, max=5335.4k, avg=1953.2 default-nowait-off-3.fio: slat (nsec): min=420, max=5102.4k, avg=1852.9 nowait-on-1.fio: slat (nsec): min=1072,max=33725k, avg=54834.7 nowait-on-2.fio: slat (nsec): min=972, max=16048k, avg=54874.8 nowait-on-3.fio: slat (nsec): min=1042,max=7085.1k, avg=54823.7 Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com> commit 6622cc4e0c7139d5173ae5f115a7d87e45a51c1a Merge: 2742538c4d28 7387653a6022 Author: Chaitanya Kulkarni <kch@nvidia.com> Date: Thu May 11 22:57:28 2023 -0700 Merge branch 'for-next' of git://git.kernel.dk/linux-block into for-next + ./compile_zram.sh + umount /mnt/zram umount: /mnt/zram: no mount point specified. + dmesg -c + modprobe -r zram + lsmod + grep zram ++ nproc + make -j 48 M=drivers/block modules + HOST=drivers/block/zram/zram.ko ++ uname -r + HOST_DEST=/lib/modules/6.4.0-rc1lblk+/kernel/drivers/block/zram/ + cp drivers/block/zram/zram.ko /lib/modules/6.4.0-rc1lblk+/kernel/drivers/block/zram// + ls -lrth /lib/modules/6.4.0-rc1lblk+/kernel/drivers/block/zram//zram.ko -rw-r--r--. 1 root root 676K May 12 00:23 /lib/modules/6.4.0-rc1lblk+/kernel/drivers/block/zram//zram.ko + dmesg -c + lsmod + grep zram + modprobe zram + sleep 1 + zramctl -s 20GB /dev/zram0 + sleep 1 + test_nowait default-nowait-off + fio fio/verify.fio --ioengine=io_uring --size=2G --filename=/dev/zram0 write-and-verify: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=16 fio-3.34 Starting 1 process Jobs: 1 (f=1): [V(1)][100.0%][r=995MiB/s][r=255k IOPS][eta 00m:00s] write-and-verify: (groupid=0, jobs=1): err= 0: pid=176756: Fri May 12 00:23:34 2023 read: IOPS=255k, BW=995MiB/s (1043MB/s)(1295MiB/1302msec) slat (nsec): min=922, max=37201, avg=2879.25, stdev=1196.56 clat (usec): min=3, max=134, avg=58.98, stdev= 5.43 lat (usec): min=6, max=137, avg=61.85, stdev= 5.61 clat percentiles (usec): | 1.00th=[ 48], 5.00th=[ 51], 10.00th=[ 53], 20.00th=[ 55], | 30.00th=[ 57], 40.00th=[ 58], 50.00th=[ 59], 60.00th=[ 60], | 70.00th=[ 62], 80.00th=[ 63], 90.00th=[ 67], 95.00th=[ 69], | 99.00th=[ 76], 99.50th=[ 78], 99.90th=[ 86], 99.95th=[ 92], | 99.99th=[ 103] write: IOPS=201k, BW=785MiB/s (823MB/s)(2048MiB/2609msec); 0 zone resets slat (nsec): min=1132, max=148451, avg=4590.62, stdev=2151.57 clat (usec): min=19, max=250, avg=74.77, stdev=11.44 lat (usec): min=23, max=338, avg=79.36, stdev=11.92 clat percentiles (usec): | 1.00th=[ 54], 5.00th=[ 61], 10.00th=[ 65], 20.00th=[ 69], | 30.00th=[ 71], 40.00th=[ 73], 50.00th=[ 75], 60.00th=[ 76], | 70.00th=[ 78], 80.00th=[ 81], 90.00th=[ 86], 95.00th=[ 91], | 99.00th=[ 116], 99.50th=[ 145], 99.90th=[ 165], 99.95th=[ 176], | 99.99th=[ 204] bw ( KiB/s): min=161184, max=886504, per=86.97%, avg=699050.67, stdev=266603.81, samples=6 iops : min=40296, max=221626, avg=174762.67, stdev=66650.95, samples=6 lat (usec) : 4=0.01%, 10=0.01%, 20=0.01%, 50=1.57%, 100=97.06% lat (usec) : 250=1.37%, 500=0.01% cpu : usr=42.84%, sys=56.55%, ctx=4056, majf=0, minf=9079 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=331621,524288,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=16 Run status group 0 (all jobs): READ: bw=995MiB/s (1043MB/s), 995MiB/s-995MiB/s (1043MB/s-1043MB/s), io=1295MiB (1358MB), run=1302-1302msec WRITE: bw=785MiB/s (823MB/s), 785MiB/s-785MiB/s (823MB/s-823MB/s), io=2048MiB (2147MB), run=2609-2609msec Disk stats (read/write): zram0: ios=327141/524288, merge=0/0, ticks=484/1980, in_queue=2464, util=97.57% + fio fio/randwrite.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 RANDWRITE: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=2 ... fio-3.34 Starting 48 processes Jobs: 48 (f=48): [w(48)][100.0%][w=714MiB/s][w=183k IOPS][eta 00m:00s] RANDWRITE: (groupid=0, jobs=48): err= 0: pid=176785: Fri May 12 00:24:34 2023 write: IOPS=214k, BW=836MiB/s (877MB/s)(49.0GiB/60002msec); 0 zone resets slat (nsec): min=381, max=1706.8k, avg=2462.04, stdev=2710.88 clat (nsec): min=221, max=19317k, avg=445142.67, stdev=614360.19 lat (usec): min=8, max=19319, avg=447.60, stdev=614.51 clat percentiles (usec): | 1.00th=[ 21], 5.00th=[ 26], 10.00th=[ 31], 20.00th=[ 43], | 30.00th=[ 55], 40.00th=[ 74], 50.00th=[ 251], 60.00th=[ 465], | 70.00th=[ 515], 80.00th=[ 725], 90.00th=[ 1020], 95.00th=[ 1418], | 99.00th=[ 3228], 99.50th=[ 4015], 99.90th=[ 5407], 99.95th=[ 6063], | 99.99th=[ 7570] bw ( KiB/s): min=479679, max=1759836, per=100.00%, avg=857832.81, stdev=5081.52, samples=5712 iops : min=119913, max=439954, avg=214451.85, stdev=1270.39, samples=5712 lat (nsec) : 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.01% lat (usec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.86%, 50=25.67% lat (usec) : 100=18.97%, 250=4.47%, 500=17.37%, 750=12.90%, 1000=8.96% lat (msec) : 2=8.51%, 4=1.77%, 10=0.50%, 20=0.01% cpu : usr=5.18%, sys=9.25%, ctx=9890182, majf=0, minf=579 IO depths : 1=0.1%, 2=100.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=0,12840341,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=2 Run status group 0 (all jobs): WRITE: bw=836MiB/s (877MB/s), 836MiB/s-836MiB/s (877MB/s-877MB/s), io=49.0GiB (52.6GB), run=60002-60002msec Disk stats (read/write): zram0: ios=0/12822005, merge=0/0, ticks=0/2558435, in_queue=2558435, util=99.96% + for i in 1 2 3 + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-default-nowait-off-1.fio + for i in 1 2 3 [r(48)][100.0%][r=3138MiB/s][r=803k IOPS][eta 00m:00s] + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-default-nowait-off-2.fio + for i in 1 2 3 [r(48)][100.0%][r=3027MiB/s][r=775k IOPS][eta 00m:00s] + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-default-nowait-off-3.fio + modprobe -r zramr(48)][100.0%][r=3074MiB/s][r=787k IOPS][eta 00m:00s] + modprobe zram nowait=1 + sleep 1 + zramctl -s 20GB /dev/zram0 + sleep 1 + test_nowait nowait-on + fio fio/verify.fio --ioengine=io_uring --size=2G --filename=/dev/zram0 write-and-verify: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=16 fio-3.34 Starting 1 process Jobs: 1 (f=1): [V(1)][80.0%][r=1192MiB/s,w=124MiB/s][r=305k,w=31.8k IOPS][eta 00m:01s] write-and-verify: (groupid=0, jobs=1): err= 0: pid=177580: Fri May 12 00:27:46 2023 read: IOPS=386k, BW=1507MiB/s (1581MB/s)(1293MiB/858msec) slat (nsec): min=1242, max=44093, avg=1777.71, stdev=460.23 clat (nsec): min=721, max=92537, avg=38932.85, stdev=2677.45 lat (nsec): min=2494, max=95692, avg=40710.56, stdev=2756.19 clat percentiles (nsec): | 1.00th=[36608], 5.00th=[37120], 10.00th=[37632], 20.00th=[37632], | 30.00th=[38144], 40.00th=[38144], 50.00th=[38144], 60.00th=[38656], | 70.00th=[38656], 80.00th=[39168], 90.00th=[39680], 95.00th=[44800], | 99.00th=[49920], 99.50th=[54016], 99.90th=[64256], 99.95th=[65280], | 99.99th=[79360] write: IOPS=169k, BW=660MiB/s (692MB/s)(2048MiB/3104msec); 0 zone resets slat (usec): min=3, max=1097, avg= 5.59, stdev= 2.13 clat (nsec): min=601, max=1389.5k, avg=88874.27, stdev=12749.86 lat (usec): min=5, max=1402, avg=94.46, stdev=13.41 clat percentiles (usec): | 1.00th=[ 69], 5.00th=[ 73], 10.00th=[ 76], 20.00th=[ 80], | 30.00th=[ 84], 40.00th=[ 87], 50.00th=[ 90], 60.00th=[ 92], | 70.00th=[ 95], 80.00th=[ 97], 90.00th=[ 101], 95.00th=[ 104], | 99.00th=[ 116], 99.50th=[ 128], 99.90th=[ 167], 99.95th=[ 186], | 99.99th=[ 241] bw ( KiB/s): min=122368, max=788104, per=88.69%, avg=599186.29, stdev=219358.99, samples=7 iops : min=30592, max=197026, avg=149796.57, stdev=54839.75, samples=7 lat (nsec) : 750=0.01% lat (usec) : 4=0.01%, 10=0.01%, 20=0.01%, 50=38.32%, 100=55.08% lat (usec) : 250=6.60%, 500=0.01% lat (msec) : 2=0.01% cpu : usr=35.09%, sys=64.76%, ctx=6, majf=0, minf=9067 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=331086,524288,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=16 Run status group 0 (all jobs): READ: bw=1507MiB/s (1581MB/s), 1507MiB/s-1507MiB/s (1581MB/s-1581MB/s), io=1293MiB (1356MB), run=858-858msec WRITE: bw=660MiB/s (692MB/s), 660MiB/s-660MiB/s (692MB/s-692MB/s), io=2048MiB (2147MB), run=3104-3104msec Disk stats (read/write): zram0: ios=304865/524288, merge=0/0, ticks=262/1514, in_queue=1776, util=97.57% + fio fio/randwrite.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 RANDWRITE: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=2 ... fio-3.34 Starting 48 processes Jobs: 48 (f=48): [w(48)][100.0%][w=759MiB/s][w=194k IOPS][eta 00m:00s] RANDWRITE: (groupid=0, jobs=48): err= 0: pid=177583: Fri May 12 00:28:47 2023 write: IOPS=227k, BW=887MiB/s (931MB/s)(52.0GiB/60001msec); 0 zone resets slat (usec): min=6, max=26750, avg=210.18, stdev=316.16 clat (nsec): min=681, max=26752k, avg=211628.33, stdev=316425.45 lat (usec): min=18, max=27199, avg=421.81, stdev=457.77 clat percentiles (usec): | 1.00th=[ 16], 5.00th=[ 18], 10.00th=[ 19], 20.00th=[ 21], | 30.00th=[ 23], 40.00th=[ 26], 50.00th=[ 29], 60.00th=[ 36], | 70.00th=[ 457], 80.00th=[ 506], 90.00th=[ 545], 95.00th=[ 594], | 99.00th=[ 1074], 99.50th=[ 1254], 99.90th=[ 3425], 99.95th=[ 3687], | 99.99th=[ 4686] bw ( KiB/s): min=710189, max=1653080, per=100.00%, avg=910501.29, stdev=3653.62, samples=5712 iops : min=177535, max=413270, avg=227617.18, stdev=913.41, samples=5712 lat (nsec) : 750=0.01%, 1000=0.01% lat (usec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=16.56%, 50=49.44% lat (usec) : 100=0.93%, 250=0.06%, 500=11.29%, 750=18.02%, 1000=1.51% lat (msec) : 2=1.91%, 4=0.24%, 10=0.03%, 20=0.01%, 50=0.01% cpu : usr=0.69%, sys=98.61%, ctx=26601, majf=0, minf=582 IO depths : 1=0.1%, 2=100.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=0,13631002,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=2 Run status group 0 (all jobs): WRITE: bw=887MiB/s (931MB/s), 887MiB/s-887MiB/s (931MB/s-931MB/s), io=52.0GiB (55.8GB), run=60001-60001msec Disk stats (read/write): zram0: ios=0/13604021, merge=0/0, ticks=0/2807107, in_queue=2807107, util=99.95% + for i in 1 2 3 + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-nowait-on-1.fio + for i in 1 2 3 [r(48)][100.0%][r=3378MiB/s][r=865k IOPS][eta 00m:00s] + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-nowait-on-2.fio + for i in 1 2 3 [r(48)][100.0%][r=3357MiB/s][r=859k IOPS][eta 00m:00s] + fio fio/randread.fio --ioengine=io_uring --size=20G --filename=/dev/zram0 --output=zram-nowait-on-3.fio + modprobe -r zramr(48)][100.0%][r=3357MiB/s][r=859k IOPS][eta 00m:00s] linux-block (for-next) # for i in IOPS cpu; do grep $i zram*fio | column -t ; done zram-default-nowait-off-1.fio: read: IOPS=802k, BW=3133MiB/s (3285MB/s)(184GiB/60001msec) zram-default-nowait-off-2.fio: read: IOPS=796k, BW=3111MiB/s (3262MB/s)(182GiB/60002msec) zram-default-nowait-off-3.fio: read: IOPS=796k, BW=3108MiB/s (3259MB/s)(182GiB/60002msec) zram-nowait-on-1.fio: read: IOPS=857k, BW=3346MiB/s (3509MB/s)(196GiB/60001msec) zram-nowait-on-2.fio: read: IOPS=857k, BW=3347MiB/s (3509MB/s)(196GiB/60001msec) zram-nowait-on-3.fio: read: IOPS=858k, BW=3353MiB/s (3516MB/s)(196GiB/60001msec) zram-default-nowait-off-1.fio: cpu : usr=5.82%, sys=13.54%, ctx=36301915, majf=0, minf=687 zram-default-nowait-off-2.fio: cpu : usr=5.84%, sys=13.03%, ctx=37781937, majf=0, minf=640 zram-default-nowait-off-3.fio: cpu : usr=5.84%, sys=12.90%, ctx=37492533, majf=0, minf=688 zram-nowait-on-1.fio: cpu : usr=1.74%, sys=97.62%, ctx=24068, majf=0, minf=783 zram-nowait-on-2.fio: cpu : usr=1.74%, sys=97.57%, ctx=24674, majf=0, minf=763 zram-nowait-on-3.fio: cpu : usr=1.76%, sys=97.59%, ctx=24725, majf=0, minf=723

[0/3] zram: queue flag nowait and mior cleanup

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