linux-kernel - Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings of SMT

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Message-ID: <4FBED670.8030002@linux.intel.com>
Date:	Thu, 24 May 2012 17:46:40 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Lutomirski <luto@....edu>,
	Jan Beulich <JBeulich@...e.com>, borislav.petkov@....com,
	arnd@...db.de, akinobu.mita@...il.com, eric.dumazet@...il.com,
	fweisbec@...il.com, rostedt@...dmis.org, hughd@...gle.com,
	jeremy@...p.org, len.brown@...el.com, tony.luck@...el.com,
	yongjie.ren@...el.com, kamezawa.hiroyu@...fujitsu.com,
	seto.hidetoshi@...fujitsu.com, penberg@...nel.org,
	yinghai@...nel.org, tglx@...utronix.de, akpm@...ux-foundation.org,
	ak@...ux.intel.com, avi@...hat.com, dhowells@...hat.com,
	mingo@...hat.com, riel@...hat.com, cpw@....com, steiner@....com,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	hpa@...or.com,
	"asit.k.mallick@...el.com" <asit.k.mallick@...el.com>
Subject: Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings
 of SMT

On
> As my limited knowledge, rewrite cr3 or invlpg will flush all levels TLB
> entries in CPU. So, what's you mean of 'HAVE to flush all'?

neither of these will flush global tlb entries.

(see the "global" bit in the page table format)


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