From: Paul Mackerras <paulus@ozlabs.org>
To: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: kvm-ppc@vger.kernel.org,
PowerPC email list <linuxppc-dev@lists.ozlabs.org>,
agraf@suse.com, Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [RFC PATCH 1/2] KVM: PPC: divide the ics lock into smaller ones for each irq
Date: Mon, 20 Jun 2016 15:25:13 +1000 [thread overview]
Message-ID: <20160620052513.GB29366@fergus.ozlabs.ibm.com> (raw)
In-Reply-To: <1463381898.19947.6.camel@TP420>
On Mon, May 16, 2016 at 02:58:18PM +0800, Li Zhong wrote:
> This patch tries to use smaller locks for each irq in the ics, instead
> of a lock at the ics level, to provide better scalability.
This looks like a worth-while thing to do. Do you have any
performance measurements to justify the change? This will increase
the size of struct kvmppc_ics by 4kB, so it would be useful to show
the performance increase that justifies it.
Also, when you resend the patch, please make the patch description
more definite - say "With this patch, we use" rather than "this patch
tries to use", for instance.
Regards,
Paul.
next prev parent reply other threads:[~2016-06-20 5:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-16 6:58 [RFC PATCH 1/2] KVM: PPC: divide the ics lock into smaller ones for each irq Li Zhong
2016-05-16 7:02 ` [RFC PATCH 2/2] KVM: PPC: Don't take lock when check irq's resend flag Li Zhong
2016-06-20 5:27 ` Paul Mackerras
2016-06-21 2:57 ` Li Zhong
2016-06-20 5:25 ` Paul Mackerras [this message]
2016-06-21 2:47 ` [RFC PATCH 1/2] KVM: PPC: divide the ics lock into smaller ones for each irq Li Zhong
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