From: Fabiano Rosas <farosas@suse.de>
To: Peter Xu <peterx@redhat.com>, qemu-devel@nongnu.org
Cc: "Dr . David Alan Gilbert" <dave@treblig.org>,
peterx@redhat.com, Alexey Perevalov <a.perevalov@samsung.com>,
Juraj Marcin <jmarcin@redhat.com>
Subject: Re: [PATCH 10/13] migration/postcopy: Cache the tid->vcpu mapping for blocktime
Date: Tue, 03 Jun 2025 13:20:31 -0300 [thread overview]
Message-ID: <87zfeo3igg.fsf@suse.de> (raw)
In-Reply-To: <20250527231248.1279174-11-peterx@redhat.com>
Peter Xu <peterx@redhat.com> writes:
> Looking up the vCPU index for each fault can be expensive when there're
> hundreds of vCPUs. Provide a cache for tid->vcpu instead with a hash
> table, then lookup from there.
>
> When at it, add another counter to record how many non-vCPU faults it gets.
> For example, the main thread can also access a guest page that was missing.
> These kind of faults are not accounted by blocktime so far.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
next prev parent reply other threads:[~2025-06-03 16:21 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-27 23:12 [PATCH 00/13] migration/postcopy: Blocktime tracking overhaul Peter Xu
2025-05-27 23:12 ` [PATCH 01/13] migration: Add option to set postcopy-blocktime Peter Xu
2025-06-02 16:50 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 02/13] migration/postcopy: Push blocktime start/end into page req mutex Peter Xu
2025-06-02 17:46 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 03/13] migration/postcopy: Drop all atomic ops in blocktime feature Peter Xu
2025-06-02 18:00 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 04/13] migration/postcopy: Make all blocktime vars 64bits Peter Xu
2025-06-02 20:42 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 05/13] migration/postcopy: Drop PostcopyBlocktimeContext.start_time Peter Xu
2025-06-03 15:52 ` Fabiano Rosas
2025-06-03 15:55 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 06/13] migration/postcopy: Bring blocktime layer to us level Peter Xu
2025-06-03 15:54 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 07/13] migration/postcopy: Add blocktime fault counts per-vcpu Peter Xu
2025-06-03 15:59 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 08/13] migration/postcopy: Report fault latencies in blocktime Peter Xu
2025-06-02 9:26 ` Markus Armbruster
2025-06-02 16:29 ` Peter Xu
2025-06-03 16:07 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 09/13] migration/postcopy: Initialize blocktime context only until listen Peter Xu
2025-06-03 16:08 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 10/13] migration/postcopy: Cache the tid->vcpu mapping for blocktime Peter Xu
2025-06-03 16:20 ` Fabiano Rosas [this message]
2025-05-27 23:12 ` [PATCH 11/13] migration/postcopy: Cleanup the total blocktime accounting Peter Xu
2025-06-03 16:22 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 12/13] migration/postcopy: Optimize blocktime fault tracking with hashtable Peter Xu
2025-06-03 16:44 ` Fabiano Rosas
2025-05-27 23:12 ` [PATCH 13/13] migration/postcopy: blocktime allows track / report non-vCPU faults Peter Xu
2025-06-03 16:50 ` Fabiano Rosas
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