From: Peter Zijlstra <peterz@infradead.org>
To: Nadav Amit <namit@vmware.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>,
Will Deacon <will.deacon@arm.com>,
"jstancek@redhat.com" <jstancek@redhat.com>,
"minchan@kernel.org" <minchan@kernel.org>,
"mgorman@suse.de" <mgorman@suse.de>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [v2 PATCH] mm: mmu_gather: remove __tlb_reset_range() for force flush
Date: Tue, 14 May 2019 13:43:43 +0200 [thread overview]
Message-ID: <20190514114343.GN2589@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <45c6096e-c3e0-4058-8669-75fbba415e07@email.android.com>
On Tue, May 14, 2019 at 02:01:34AM +0000, Nadav Amit wrote:
> > diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
> > index 99740e1dd273..cc251422d307 100644
> > --- a/mm/mmu_gather.c
> > +++ b/mm/mmu_gather.c
> > @@ -251,8 +251,9 @@ void tlb_finish_mmu(struct mmu_gather *tlb,
> > * forcefully if we detect parallel PTE batching threads.
> > */
> > if (mm_tlb_flush_nested(tlb->mm)) {
> > + tlb->fullmm = 1;
> > __tlb_reset_range(tlb);
> > - __tlb_adjust_range(tlb, start, end - start);
> > + tlb->freed_tables = 1;
> > }
> >
> > tlb_flush_mmu(tlb);
>
>
> I think that this should have set need_flush_all and not fullmm.
Difficult, mmu_gather::need_flush_all is arch specific and not everybody
implements it.
And while mmu_gather::fullmm isn't strictly correct either; we can
(ab)use it here, because at tlb_finish_mmu() time the differences don't
matter anymore.
next prev parent reply other threads:[~2019-05-14 11:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <45c6096e-c3e0-4058-8669-75fbba415e07@email.android.com>
2019-05-14 7:15 ` [v2 PATCH] mm: mmu_gather: remove __tlb_reset_range() for force flush Jan Stancek
2019-05-14 7:21 ` Nadav Amit
2019-05-14 11:49 ` Peter Zijlstra
2019-05-14 11:43 ` Peter Zijlstra [this message]
2019-05-09 23:26 Yang Shi
2019-05-13 16:38 ` Will Deacon
2019-05-13 23:01 ` Yang Shi
2019-05-14 14:54 ` Will Deacon
2019-05-14 17:25 ` Yang Shi
2019-05-16 15:29 ` Jan Stancek
2019-05-20 2:59 ` Yang Shi
2019-05-14 11:52 ` Peter Zijlstra
2019-05-14 12:02 ` Will Deacon
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