From: Johannes Thumshirn <jthumshirn@suse.de>
To: Elena Reshetova <elena.reshetova@intel.com>
Cc: axboe@kernel.dk, james.bottomley@hansenpartnership.com,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-btrfs@vger.kernel.org,
peterz@infradead.org, gregkh@linuxfoundation.org,
fujita.tomonori@lab.ntt.co.jp, mingo@redhat.com, clm@fb.com,
jbacik@fb.com, dsterba@suse.com, keescook@chromium.org
Subject: Re: [PATCH 0/6] v4 block refcount conversion patches
Date: Fri, 20 Oct 2017 10:43:03 +0200 [thread overview]
Message-ID: <mqdr2typ5uw.fsf@linux-x5ow.site> (raw)
In-Reply-To: <1508487362-26663-1-git-send-email-elena.reshetova@intel.com> (Elena Reshetova's message of "Fri, 20 Oct 2017 11:15:56 +0300")
Elena Reshetova <elena.reshetova@intel.com> writes:
> Elena Reshetova (6):
> block: convert bio.__bi_cnt from atomic_t to refcount_t
> block: convert blk_queue_tag.refcnt from atomic_t to refcount_t
> block: convert blkcg_gq.refcnt from atomic_t to refcount_t
> block: convert io_context.active_ref from atomic_t to refcount_t
> block: convert bsg_device.ref_count from atomic_t to refcount_t
> drivers, block: convert xen_blkif.refcnt from atomic_t to refcount_t
Hi Elena,
While the bsg ref_count is cheap, do you have any numbers how the other
conversions compare in performance (throughput and latency) vs atomics?
It should be quite easy to measure against a null_blk device.
Thanks a lot,
Johannes
--=20
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=C3=BCrnberg
GF: Felix Imend=C3=B6rffer, Jane Smithard, Graham Norton
HRB 21284 (AG N=C3=BCrnberg)
Key fingerprint =3D EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Thumshirn <jthumshirn@suse.de>
To: Elena Reshetova <elena.reshetova@intel.com>
Cc: axboe@kernel.dk, james.bottomley@hansenpartnership.com,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-btrfs@vger.kernel.org,
peterz@infradead.org, gregkh@linuxfoundation.org,
fujita.tomonori@lab.ntt.co.jp, mingo@redhat.com, clm@fb.com,
jbacik@fb.com, dsterba@suse.com, keescook@chromium.org
Subject: Re: [PATCH 0/6] v4 block refcount conversion patches
Date: Fri, 20 Oct 2017 10:43:03 +0200 [thread overview]
Message-ID: <mqdr2typ5uw.fsf@linux-x5ow.site> (raw)
In-Reply-To: <1508487362-26663-1-git-send-email-elena.reshetova@intel.com> (Elena Reshetova's message of "Fri, 20 Oct 2017 11:15:56 +0300")
Elena Reshetova <elena.reshetova@intel.com> writes:
> Elena Reshetova (6):
> block: convert bio.__bi_cnt from atomic_t to refcount_t
> block: convert blk_queue_tag.refcnt from atomic_t to refcount_t
> block: convert blkcg_gq.refcnt from atomic_t to refcount_t
> block: convert io_context.active_ref from atomic_t to refcount_t
> block: convert bsg_device.ref_count from atomic_t to refcount_t
> drivers, block: convert xen_blkif.refcnt from atomic_t to refcount_t
Hi Elena,
While the bsg ref_count is cheap, do you have any numbers how the other
conversions compare in performance (throughput and latency) vs atomics?
It should be quite easy to measure against a null_blk device.
Thanks a lot,
Johannes
--
Johannes Thumshirn Storage
jthumshirn@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
next prev parent reply other threads:[~2017-10-20 8:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 8:15 [PATCH 0/6] v4 block refcount conversion patches Elena Reshetova
2017-10-20 8:15 ` [PATCH 1/6] block: convert bio.__bi_cnt from atomic_t to refcount_t Elena Reshetova
2017-10-20 8:15 ` [PATCH 2/6] block: convert blk_queue_tag.refcnt " Elena Reshetova
2017-10-20 8:15 ` [PATCH 3/6] block: convert blkcg_gq.refcnt " Elena Reshetova
2017-10-20 8:16 ` [PATCH 4/6] block: convert io_context.active_ref " Elena Reshetova
2017-10-20 8:16 ` [PATCH 5/6] block: convert bsg_device.ref_count " Elena Reshetova
2017-10-20 8:16 ` [PATCH 6/6] drivers, block: convert xen_blkif.refcnt " Elena Reshetova
2017-10-20 8:43 ` Johannes Thumshirn [this message]
2017-10-20 8:43 ` [PATCH 0/6] v4 block refcount conversion patches Johannes Thumshirn
2017-10-20 10:25 ` Reshetova, Elena
2017-10-20 10:25 ` Reshetova, Elena
2017-10-20 10:25 ` Reshetova, Elena
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