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From: Mikulas Patocka <mpatocka@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Zdenek Kabelac <zkabelac@redhat.com>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com
Subject: [PATCH 0/4] brd: implement discard
Date: Fri, 16 Sep 2022 04:58:54 -0400 (EDT)	[thread overview]
Message-ID: <alpine.LRH.2.02.2209151604410.13231@file01.intranet.prod.int.rdu2.redhat.com> (raw)

Hi

This series of patches implements discard, write_zeroes and secure_erase 
support for the brd driver.

Zdenek asked me to write it, because we use brd in the lvm2 testsuite and 
it would be benefical to run the testsuite with discard enabled in order 
to test discard handling.

This patch series should have no performance impact - it doesn't add any 
locks to the common I/O paths. It only extends rcu read region around 
lookup and reading or writing of a single page. Discarded pages are freed 
with "call_rcu" to make sure that if we mix discard with I/O, the I/O 
won't access freed memory.

Mikulas


WARNING: multiple messages have this Message-ID (diff)
From: Mikulas Patocka <mpatocka@redhat.com>
To: Jens Axboe <axboe@kernel.dk>, Zdenek Kabelac <zkabelac@redhat.com>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com
Subject: [dm-devel] [PATCH 0/4] brd: implement discard
Date: Fri, 16 Sep 2022 04:58:54 -0400 (EDT)	[thread overview]
Message-ID: <alpine.LRH.2.02.2209151604410.13231@file01.intranet.prod.int.rdu2.redhat.com> (raw)

Hi

This series of patches implements discard, write_zeroes and secure_erase 
support for the brd driver.

Zdenek asked me to write it, because we use brd in the lvm2 testsuite and 
it would be benefical to run the testsuite with discard enabled in order 
to test discard handling.

This patch series should have no performance impact - it doesn't add any 
locks to the common I/O paths. It only extends rcu read region around 
lookup and reading or writing of a single page. Discarded pages are freed 
with "call_rcu" to make sure that if we mix discard with I/O, the I/O 
won't access freed memory.

Mikulas
--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel


             reply	other threads:[~2022-09-16  8:59 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-16  8:58 Mikulas Patocka [this message]
2022-09-16  8:58 ` [dm-devel] [PATCH 0/4] brd: implement discard Mikulas Patocka
2022-09-16  8:59 ` [PATCH 1/4] brd: make brd_insert_page return bool Mikulas Patocka
2022-09-16  8:59   ` [dm-devel] " Mikulas Patocka
2022-09-20  7:28   ` Christoph Hellwig
2022-09-20  7:28     ` [dm-devel] " Christoph Hellwig
2022-09-16  8:59 ` [PATCH 2/4] brd: extend the rcu regions to cover read and write Mikulas Patocka
2022-09-16  8:59   ` [dm-devel] " Mikulas Patocka
2022-09-20  7:38   ` Christoph Hellwig
2022-09-20  7:38     ` [dm-devel] " Christoph Hellwig
2022-09-16  9:00 ` [dm-devel] [PATCH 3/4] brd: enable discard Mikulas Patocka
2022-09-16  9:00   ` Mikulas Patocka
2022-09-20  7:39   ` [dm-devel] " Christoph Hellwig
2022-09-20  7:39     ` Christoph Hellwig
2022-09-20 17:47     ` [dm-devel] " Mikulas Patocka
2022-09-20 17:47       ` Mikulas Patocka
2022-09-16  9:00 ` [dm-devel] [PATCH 4/4] brd: implement secure erase and write zeroes Mikulas Patocka
2022-09-16  9:00   ` Mikulas Patocka
2022-09-20  7:29   ` Christoph Hellwig
2022-09-20  7:29     ` [dm-devel] " Christoph Hellwig
2022-09-20 17:46     ` Mikulas Patocka
2022-09-20 17:46       ` Mikulas Patocka

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