linux-kernel - Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations

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Message-ID: <93b02f65-25cd-13b0-f5ef-6b286b328aad@redhat.com>
Date:	Thu, 18 Aug 2016 09:04:47 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Punit Agrawal <punit.agrawal@....com>
Cc:	kvm@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>, kvmarm@...ts.cs.columbia.edu,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations



On 17/08/2016 19:20, Punit Agrawal wrote:
> > > Having the ability to monitor the usage of guest TLB invalidations in
> > > the host can be useful to diagnose performance issues on such systems.
> >
> > Are there hardware performance counters for these operations?
> 
> That would have been ideal! There are PMU events defined for TLB
> accesses and refills but unhelpfully none of them track maintenance
> operations.

I guess the patches do make sense then. :)

Paolo