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Date: Mon, 26 May 2014 18:01:57 +0300 From: roma1390 <roma1390@...il.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Morgan Mears <Morgan.Mears@...app.com>, Mikulas Patocka <mpatocka@...hat.com>, Mike Snitzer <snitzer@...hat.com>, Joe Thornber <ejt@...hat.com>, Heinz Mauelshagen <heinzm@...hat.com> Subject: Re: 3.13-1 dm cache possible race condition Hello again, Is there need any additional information? Or this feature is not ready for production? On Mon, May 19, 2014 at 11:31 PM, roma1390 <roma1390@...il.com> wrote: > Hello again. > > Tried this on latest head: 14186fea0cb06bc43181ce239efe0df6f1af260a > > Getting same error. If there is needed some additional information, > please contact. > > On Sun, May 18, 2014 at 6:35 PM, roma1390 <roma1390@...il.com> wrote: >> I think that somehow is got broken cache->nr_dirty >> >> # dmsetup status foo0 >> 0 32768 cache 7/4096 1728240 256 1675650 0 0 64 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> >> >> See: 4294967295 this is -1 as is not OK. >> >> >> Kernel: Debian stock 3.13-1-amd64 >> >> Actions taken: >> >> modprobe brd >> BLOCKS=$[`blockdev --getsize64 /dev/ram0`/512] >> METADATA_DEV=/dev/ram0 >> CACHE_DEV=/dev/ram1 >> DATA_DEV=/dev/ram2 >> dmsetup create foo0 --table "0 $BLOCKS cache $METADATA_DEV $CACHE_DEV >> $DATA_DEV 512 1 writeback default 0" >> >> Test: >> one terminal window: >> while true; do dd if=/dev/zero of=/dev/mapper/foo0 bs=512; done >> second window: >> while sleep .1; do dmsetup status foo0; done >> >> >> after some time from 0 i get to 4294967295, which is think is not >> expected value. >> >> >> More info: >> device just created: >> 0 32768 cache 10/4096 1728259 256 1675650 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> after some (~20) writes: >> 0 32768 cache 10/4096 1790456 256 1737543 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> started full speed test, after 2 sec: >> 0 32768 cache 10/4096 2475934 256 2417479 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2485872 256 2428545 0 0 0 64 5 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2495964 256 2437959 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2506447 256 2447365 0 0 0 64 20 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2515948 256 2458439 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2526687 256 2466631 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> after ~10sec: >> 0 32768 cache 10/4096 2667754 256 2609991 0 0 0 64 0 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2678571 256 2618183 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> 0 32768 cache 10/4096 2687846 256 2630471 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> 0 32768 cache 10/4096 2698349 256 2638663 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> 0 32768 cache 10/4096 2708082 256 2648514 0 0 0 64 5 1 writeback 2 >> migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 >> 0 32768 cache 10/4096 2717700 256 2659143 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> 0 32768 cache 10/4096 2728596 256 2667335 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> 0 32768 cache 10/4096 2737453 256 2679623 0 0 0 64 4294967295 1 >> writeback 2 migration_threshold 2048 4 random_threshold 4 >> sequential_threshold 512 >> ^C -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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