From: Kevin Wolf <kwolf@redhat.com>
To: Max Reitz <mreitz@redhat.com>
Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
Eric Blake <eblake@redhat.com>,
qemu-devel@nongnu.org, qemu-block@nongnu.org
Subject: Re: [PATCH v2 0/6] block: block-status cache for data regions
Date: Tue, 6 Jul 2021 19:06:36 +0200 [thread overview]
Message-ID: <YOSNnK5VVT+vukwK@redhat.com> (raw)
In-Reply-To: <20210623150143.188184-1-mreitz@redhat.com>
Am 23.06.2021 um 17:01 hat Max Reitz geschrieben:
> Hi,
>
> See the cover letter from v1 for the general idea:
>
> https://lists.nongnu.org/archive/html/qemu-block/2021-06/msg00843.html
>
>
> The biggest change here in v2 is that instead of having a common CoMutex
> protect the block-status cache, we’re using RCU now. So to read from
> the cache, or even to invalidate it, no lock is needed, only to update
> it with new data.
>
> Disclaimer: I have no experience with RCU in practice so far, neither in
> qemu nor anywhere else. So I hope I’ve used it correctly...
This I hope as well. :-)
With the missing qatomic_rcu_read() added:
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
prev parent reply other threads:[~2021-07-06 17:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-23 15:01 [PATCH v2 0/6] block: block-status cache for data regions Max Reitz
2021-06-23 15:01 ` [PATCH v2 1/6] block: Drop BDS comment regarding bdrv_append() Max Reitz
2021-06-23 15:01 ` [PATCH v2 2/6] block: block-status cache for data regions Max Reitz
2021-06-24 10:05 ` Vladimir Sementsov-Ogievskiy
2021-06-24 11:11 ` Max Reitz
2021-07-06 17:04 ` Kevin Wolf
2021-07-12 7:45 ` Max Reitz
2021-06-23 15:01 ` [PATCH v2 3/6] block: Clarify that @bytes is no limit on *pnum Max Reitz
2021-06-24 9:15 ` Vladimir Sementsov-Ogievskiy
2021-06-24 10:16 ` Max Reitz
2021-06-24 10:25 ` Vladimir Sementsov-Ogievskiy
2021-06-24 11:12 ` Max Reitz
2021-06-28 19:10 ` Eric Blake
2021-07-12 7:47 ` Max Reitz
2021-06-23 15:01 ` [PATCH v2 4/6] block/file-posix: Do not force-cap *pnum Max Reitz
2021-06-23 15:01 ` [PATCH v2 5/6] block/gluster: " Max Reitz
2021-06-23 15:01 ` [PATCH v2 6/6] block/iscsi: " Max Reitz
2021-07-06 17:06 ` Kevin Wolf [this message]
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