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Date: Mon, 21 May 2012 09:47:09 +0200 From: Martin Schwidefsky <schwidefsky@...ibm.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Catalin Marinas <catalin.marinas@....com>, Russell King <rmk@....linux.org.uk>, Paul Mundt <lethal@...ux-sh.org>, Andrea Arcangeli <aarcange@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, David Miller <davem@...emloft.net>, Hugh Dickins <hugh.dickins@...cali.co.uk>, Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...nel.dk>, Chris Metcalf <cmetcalf@...era.com> Subject: Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb On Thu, 17 May 2012 18:24:44 +0200 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > On Thu, 2012-05-17 at 17:00 +0100, Catalin Marinas wrote: > > > BTW, looking at your tlb-unify branch, does tlb_remove_table() call > > tlb_flush/tlb_flush_mmu before freeing the tables? I can only see > > tlb_remove_page() doing this. On ARM, even UP, we need the TLB flushing > > after clearing the pmd and before freeing the pte page table (and > > ideally doing it less often than at every pte_free_tlb() call). > > No I don't think it does, so far the only archs using the RCU stuff are > ppc,sparc and s390 and none of those needed that (Xen might join them > soon though). But I will have to look and consider this more carefully. > I 'lost' most of the ppc/sparc/s390 details from memory to say this with > any certainty. s390 needs a TLB flush for the pgd, pud and pmd tables. See git commit cd94154cc6a28dd9dc271042c1a59c08d26da886 for the sad details. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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