From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Igor Druzhinin <igor.druzhinin@citrix.com>
Cc: xen-devel@lists.xenproject.org, wl@xen.org, jbeulich@suse.com,
andrew.cooper3@citrix.com
Subject: Re: [Xen-devel] [PATCH 1/2] x86/time: drop vtsc_{kern, user}count debug counters
Date: Mon, 16 Dec 2019 10:47:44 +0100 [thread overview]
Message-ID: <20191216094744.GL11756@Air-de-Roger> (raw)
In-Reply-To: <1576277282-6590-2-git-send-email-igor.druzhinin@citrix.com>
On Fri, Dec 13, 2019 at 10:48:01PM +0000, Igor Druzhinin wrote:
> They either need to be transformed to atomics to work correctly
> (currently they left unprotected for HVM domains) or dropped entirely
^ are used
> as taking a per-domain spinlock is too expensive for high-vCPU count
> domains even for debug build given this lock is taken too often.
>
> Choose the latter as they are not extremely important anyway.
>
> Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
I don't find those counters specially useful TBH, but I'm not sure whether
others find them useful. The change LGTM, so:
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Thanks, Roger.
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next prev parent reply other threads:[~2019-12-16 9:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 22:48 [Xen-devel] [PATCH 0/2] vTSC performance improvements Igor Druzhinin
2019-12-13 22:48 ` [Xen-devel] [PATCH 1/2] x86/time: drop vtsc_{kern, user}count debug counters Igor Druzhinin
2019-12-16 9:47 ` Roger Pau Monné [this message]
2019-12-16 14:24 ` Andrew Cooper
2019-12-13 22:48 ` [Xen-devel] [PATCH 2/2] x86/time: update vtsc_last with cmpxchg and drop vtsc_lock Igor Druzhinin
2019-12-16 10:00 ` Roger Pau Monné
2019-12-16 11:21 ` Jan Beulich
2019-12-16 12:30 ` Roger Pau Monné
2019-12-16 12:45 ` Jan Beulich
2019-12-16 12:55 ` Roger Pau Monné
2019-12-16 12:53 ` Igor Druzhinin
2019-12-16 12:57 ` Roger Pau Monné
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