linux-kernel - Re: powerpc/mm/nohash: do not flush the entire mm when range is a single page

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Message-Id: <3zVGNG3nlpz9sPk@ozlabs.org>
Date:   Mon, 29 Jan 2018 15:13:50 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: powerpc/mm/nohash: do not flush the entire mm when range is a single page

On Tue, 2018-01-23 at 13:22:50 UTC, Christophe Leroy wrote:
> Most of the time, flush_tlb_range() is called on single pages.
> At the time being, flush_tlb_range() inconditionnaly calls
> flush_tlb_mm() which flushes at least the entire PID pages and on
> older CPUs like 4xx or 8xx it flushes the entire TLB table.
> 
> This patch calls flush_tlb_page() instead of flush_tlb_mm() when
> the range is a single page.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/5c8136fa1af7c0e9b4aec89cf2832f

cheers