From: Christoph Hellwig <hch@lst.de> To: Jens Axboe <axboe@kernel.dk> Cc: Jeffle Xu <jefflexu@linux.alibaba.com>, Ming Lei <ming.lei@redhat.com>, Damien Le Moal <Damien.LeMoal@wdc.com>, Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>, "Wunderlich, Mark" <mark.wunderlich@intel.com>, "Vasudevan, Anil" <anil.vasudevan@intel.com>, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nvme@lists.infradead.org Subject: [PATCH 10/15] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Date: Wed, 12 May 2021 15:15:40 +0200 [thread overview] Message-ID: <20210512131545.495160-11-hch@lst.de> (raw) In-Reply-To: <20210512131545.495160-1-hch@lst.de> This flags ensures that the pages will not be reused for non-bio allocations before the end of an RCU grace period. With that we can safely use a RCU lookup for bio polling as long as we are fine with occasionally polling the wrong device. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/bio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index 44205dfb6b60..de5505d7018e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -82,7 +82,8 @@ static struct bio_slab *create_bio_slab(unsigned int size) snprintf(bslab->name, sizeof(bslab->name), "bio-%d", size); bslab->slab = kmem_cache_create(bslab->name, size, - ARCH_KMALLOC_MINALIGN, SLAB_HWCACHE_ALIGN, NULL); + ARCH_KMALLOC_MINALIGN, + SLAB_HWCACHE_ALIGN | SLAB_TYPESAFE_BY_RCU, NULL); if (!bslab->slab) goto fail_alloc_slab; -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de> To: Jens Axboe <axboe@kernel.dk> Cc: Jeffle Xu <jefflexu@linux.alibaba.com>, Ming Lei <ming.lei@redhat.com>, Damien Le Moal <Damien.LeMoal@wdc.com>, Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>, "Wunderlich, Mark" <mark.wunderlich@intel.com>, "Vasudevan, Anil" <anil.vasudevan@intel.com>, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nvme@lists.infradead.org Subject: [PATCH 10/15] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Date: Wed, 12 May 2021 15:15:40 +0200 [thread overview] Message-ID: <20210512131545.495160-11-hch@lst.de> (raw) In-Reply-To: <20210512131545.495160-1-hch@lst.de> This flags ensures that the pages will not be reused for non-bio allocations before the end of an RCU grace period. With that we can safely use a RCU lookup for bio polling as long as we are fine with occasionally polling the wrong device. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/bio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index 44205dfb6b60..de5505d7018e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -82,7 +82,8 @@ static struct bio_slab *create_bio_slab(unsigned int size) snprintf(bslab->name, sizeof(bslab->name), "bio-%d", size); bslab->slab = kmem_cache_create(bslab->name, size, - ARCH_KMALLOC_MINALIGN, SLAB_HWCACHE_ALIGN, NULL); + ARCH_KMALLOC_MINALIGN, + SLAB_HWCACHE_ALIGN | SLAB_TYPESAFE_BY_RCU, NULL); if (!bslab->slab) goto fail_alloc_slab; -- 2.30.2 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2021-05-12 13:16 UTC|newest] Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-12 13:15 switch block layer polling to a bio based model v3 Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 13:15 ` [PATCH 01/15] direct-io: remove blk_poll support Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 13:15 ` [PATCH 02/15] block: don't try to poll multi-bio I/Os in __blkdev_direct_IO Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 20:54 ` Sagi Grimberg 2021-05-12 20:54 ` Sagi Grimberg 2021-05-16 18:01 ` Kanchan Joshi 2021-05-16 18:01 ` Kanchan Joshi 2021-05-12 13:15 ` [PATCH 03/15] iomap: don't try to poll multi-bio I/Os in __iomap_dio_rw Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:32 ` Darrick J. Wong 2021-05-12 21:32 ` Darrick J. Wong 2021-05-12 13:15 ` [PATCH 04/15] blk-mq: factor out a blk_qc_to_hctx helper Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 20:58 ` Sagi Grimberg 2021-05-12 20:58 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 05/15] blk-mq: factor out a "classic" poll helper Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 20:59 ` Sagi Grimberg 2021-05-12 20:59 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 06/15] blk-mq: remove blk_qc_t_to_tag and blk_qc_t_is_internal Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:42 ` Sagi Grimberg 2021-05-12 21:42 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 07/15] blk-mq: remove blk_qc_t_valid Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:43 ` Sagi Grimberg 2021-05-12 21:43 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 08/15] io_uring: don't sleep when polling for I/O Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:55 ` Sagi Grimberg 2021-05-12 21:55 ` Sagi Grimberg 2021-05-19 13:02 ` Christoph Hellwig 2021-05-19 13:02 ` Christoph Hellwig 2021-05-12 13:15 ` [PATCH 09/15] block: rename REQ_HIPRI to REQ_POLLED Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:56 ` Sagi Grimberg 2021-05-12 21:56 ` Sagi Grimberg 2021-05-12 22:43 ` Chaitanya Kulkarni 2021-05-12 22:43 ` Chaitanya Kulkarni 2021-05-12 13:15 ` Christoph Hellwig [this message] 2021-05-12 13:15 ` [PATCH 10/15] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Christoph Hellwig 2021-05-12 13:15 ` [PATCH 11/15] block: define 'struct bvec_iter' as packed Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 21:58 ` Sagi Grimberg 2021-05-12 21:58 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 12/15] block: switch polling to be bio based Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 22:03 ` Sagi Grimberg 2021-05-12 22:03 ` Sagi Grimberg 2021-05-12 22:12 ` Keith Busch 2021-05-12 22:12 ` Keith Busch 2021-05-14 2:50 ` Keith Busch 2021-05-14 2:50 ` Keith Busch 2021-05-14 16:26 ` Keith Busch 2021-05-14 16:26 ` Keith Busch 2021-05-14 16:28 ` Christoph Hellwig 2021-05-14 16:28 ` Christoph Hellwig 2021-05-13 1:26 ` Ming Lei 2021-05-13 1:26 ` Ming Lei 2021-05-13 1:23 ` Ming Lei 2021-05-13 1:23 ` Ming Lei 2021-05-12 13:15 ` [PATCH 13/15] block: don't allow writing to the poll queue attribute Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 22:04 ` Sagi Grimberg 2021-05-12 22:04 ` Sagi Grimberg 2021-05-12 13:15 ` [PATCH 14/15] nvme-multipath: set QUEUE_FLAG_NOWAIT Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 13:15 ` [PATCH 15/15] nvme-multipath: enable polled I/O Christoph Hellwig 2021-05-12 13:15 ` Christoph Hellwig 2021-05-12 22:10 ` Sagi Grimberg 2021-05-12 22:10 ` Sagi Grimberg 2021-05-12 22:16 ` Keith Busch 2021-05-12 22:16 ` Keith Busch 2021-05-13 23:33 ` switch block layer polling to a bio based model v3 Wunderlich, Mark 2021-05-13 23:33 ` Wunderlich, Mark -- strict thread matches above, loose matches on Subject: below -- 2021-04-27 16:16 switch block layer polling to a bio based model v2 Christoph Hellwig 2021-04-27 16:16 ` [PATCH 10/15] block: use SLAB_TYPESAFE_BY_RCU for the bio slab Christoph Hellwig
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