From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Andy Lutomirski <luto@kernel.org>, Mel Gorman <mgorman@suse.de>
Cc: Nadav Amit <nadav.amit@gmail.com>, linux-mm@kvack.org
Subject: Re: Potential race in TLB flush batching?
Date: Fri, 14 Jul 2017 17:00:41 +1000 [thread overview]
Message-ID: <1500015641.2865.81.camel@kernel.crashing.org> (raw)
In-Reply-To: <CALCETrXvkF3rxLijtou3ndSxG9vu62hrqh1ZXkaWgWbL-wd+cg@mail.gmail.com>
On Tue, 2017-07-11 at 15:07 -0700, Andy Lutomirski wrote:
> On Tue, Jul 11, 2017 at 12:18 PM, Mel Gorman <mgorman@suse.de> wrote:
>
> I would change this slightly:
>
> > +void flush_tlb_batched_pending(struct mm_struct *mm)
> > +{
> > +A A A A A A if (mm->tlb_flush_batched) {
> > +A A A A A A A A A A A A A A flush_tlb_mm(mm);
>
> How about making this a new helper arch_tlbbatch_flush_one_mm(mm);
> The idea is that this could be implemented as flush_tlb_mm(mm), but
> the actual semantics needed are weaker.A All that's really needed
> AFAICS is to make sure that any arch_tlbbatch_add_mm() calls on this
> mm that have already happened become effective by the time that
> arch_tlbbatch_flush_one_mm() returns.
Jumping in ... I just discovered that 'new' batching stuff... is it
documented anywhere ?
We already had some form of batching via the mmu_gather, now there's a
different somewhat orthogonal and it's completely unclear what it's
about and why we couldn't use what we already had. Also what
assumptions it makes if I want to port it to my arch....
The page table management code was messy enough without yet another
undocumented batching mechanism that isn't quite the one we already
had...
Ben.
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next prev parent reply other threads:[~2017-07-14 7:00 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-11 0:52 Potential race in TLB flush batching? Nadav Amit
2017-07-11 6:41 ` Mel Gorman
2017-07-11 7:30 ` Nadav Amit
2017-07-11 9:29 ` Mel Gorman
2017-07-11 10:40 ` Nadav Amit
2017-07-11 13:20 ` Mel Gorman
2017-07-11 14:58 ` Andy Lutomirski
2017-07-11 15:53 ` Mel Gorman
2017-07-11 17:23 ` Andy Lutomirski
2017-07-11 19:18 ` Mel Gorman
2017-07-11 20:06 ` Nadav Amit
2017-07-11 21:09 ` Mel Gorman
2017-07-11 20:09 ` Mel Gorman
2017-07-11 21:52 ` Mel Gorman
2017-07-11 22:27 ` Nadav Amit
2017-07-11 22:34 ` Nadav Amit
2017-07-12 8:27 ` Mel Gorman
2017-07-12 23:27 ` Nadav Amit
2017-07-12 23:36 ` Andy Lutomirski
2017-07-12 23:42 ` Nadav Amit
2017-07-13 5:38 ` Andy Lutomirski
2017-07-13 16:05 ` Nadav Amit
2017-07-13 16:06 ` Andy Lutomirski
2017-07-13 6:07 ` Mel Gorman
2017-07-13 16:08 ` Andy Lutomirski
2017-07-13 17:07 ` Mel Gorman
2017-07-13 17:15 ` Andy Lutomirski
2017-07-13 18:23 ` Mel Gorman
2017-07-14 23:16 ` Nadav Amit
2017-07-15 15:55 ` Mel Gorman
2017-07-15 16:41 ` Andy Lutomirski
2017-07-17 7:49 ` Mel Gorman
2017-07-18 21:28 ` Nadav Amit
2017-07-19 7:41 ` Mel Gorman
2017-07-19 19:41 ` Nadav Amit
2017-07-19 19:58 ` Mel Gorman
2017-07-19 20:20 ` Nadav Amit
2017-07-19 21:47 ` Mel Gorman
2017-07-19 22:19 ` Nadav Amit
2017-07-19 22:59 ` Mel Gorman
2017-07-19 23:39 ` Nadav Amit
2017-07-20 7:43 ` Mel Gorman
2017-07-22 1:19 ` Nadav Amit
2017-07-24 9:58 ` Mel Gorman
2017-07-24 19:46 ` Nadav Amit
2017-07-25 7:37 ` Minchan Kim
2017-07-25 8:51 ` Mel Gorman
2017-07-25 9:11 ` Minchan Kim
2017-07-25 10:10 ` Mel Gorman
2017-07-26 5:43 ` Minchan Kim
2017-07-26 9:22 ` Mel Gorman
2017-07-26 19:18 ` Nadav Amit
2017-07-26 23:40 ` Minchan Kim
2017-07-27 0:09 ` Nadav Amit
2017-07-27 0:34 ` Minchan Kim
2017-07-27 0:48 ` Nadav Amit
2017-07-27 1:13 ` Nadav Amit
2017-07-27 7:04 ` Minchan Kim
2017-07-27 7:21 ` Mel Gorman
2017-07-27 16:04 ` Nadav Amit
2017-07-27 17:36 ` Mel Gorman
2017-07-26 23:44 ` Minchan Kim
2017-07-11 22:07 ` Andy Lutomirski
2017-07-11 22:33 ` Mel Gorman
2017-07-14 7:00 ` Benjamin Herrenschmidt [this message]
2017-07-14 8:31 ` Mel Gorman
2017-07-14 9:02 ` Benjamin Herrenschmidt
2017-07-14 9:27 ` Mel Gorman
2017-07-14 22:21 ` Andy Lutomirski
2017-07-11 16:22 ` Nadav Amit
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