linux-kernel - Re: [RESEND][PATCH] mm: vmstats: tlb flush counters

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Message-ID: <51E9609D.4030201@sr71.net>
Date:	Fri, 19 Jul 2013 08:51:57 -0700
From:	Dave Hansen <dave@...1.net>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RESEND][PATCH] mm: vmstats: tlb flush counters

On 07/19/2013 01:28 AM, Ingo Molnar wrote:
> UP is slowly going extinct, but in any case these counters ought to inform 
> us about TLB flushes even on UP systems:
> 
>>>> > > > +		NR_TLB_LOCAL_FLUSH_ALL,
>>>> > > > +		NR_TLB_LOCAL_FLUSH_ONE,
>>>> > > > +		NR_TLB_LOCAL_FLUSH_ONE_KERNEL,
> While these ought to be compiled out on UP kernels:
> 
>>>> > > > +		NR_TLB_REMOTE_FLUSH,	/* cpu tried to flush others' tlbs */
>>>> > > > +		NR_TLB_REMOTE_FLUSH_RECEIVED,/* cpu received ipi for flush */
> Right?

Yeah, it's useful on UP too.  But I realized that my changes were
confined to the SMP code.  The UP code is almost all in one of the
headers, and I didn't touch it.  So I've got some work there to fix it up.

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