From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>,
Peter Zijlstra <peterz@infradead.org>, Jan Kara <jack@suse.cz>,
Dave Hansen <dave.hansen@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Tony Luck <tony.luck@intel.com>
Subject: Re: Dirty/Access bits vs. page content
Date: Fri, 25 Apr 2014 12:41:40 +1000 [thread overview]
Message-ID: <1398393700.8437.22.camel@pasglop> (raw)
In-Reply-To: <1398389846.8437.6.camel@pasglop>
On Fri, 2014-04-25 at 11:37 +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2014-04-24 at 16:46 -0700, Linus Torvalds wrote:
> > - we do the TLB shootdown holding the page table lock (but that's not
> > new - ptep_get_and_flush does the same
> >
>
> The flip side is that we do a lot more IPIs for large invalidates,
> since we drop the PTL on every page table page.
Oh I missed that your patch was smart enough to only do that in the
presence of non-anonymous dirty pages. That should take care of the
common case of short lived programs, those should still fit in a
single big batch.
Cheers,
Ben.
next prev parent reply other threads:[~2014-04-25 2:42 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1398032742.19682.11.camel@pasglop>
[not found] ` <CA+55aFz1sK+PF96LYYZY7OB7PBpxZu-uNLWLvPiRz-tJsBqX3w@mail.gmail.com>
[not found] ` <1398054064.19682.32.camel@pasglop>
[not found] ` <1398057630.19682.38.camel@pasglop>
[not found] ` <CA+55aFwWHBtihC3w9E4+j4pz+6w7iTnYhTf4N3ie15BM9thxLQ@mail.gmail.com>
[not found] ` <53558507.9050703@zytor.com>
2014-04-21 22:29 ` Dirty/Access bits vs. page content Linus Torvalds
2014-04-21 22:44 ` Dave Hansen
2014-04-22 0:31 ` Linus Torvalds
2014-04-22 0:44 ` Linus Torvalds
2014-04-22 5:15 ` Tony Luck
2014-04-22 5:15 ` Tony Luck
2014-04-22 14:55 ` Linus Torvalds
2014-04-22 14:55 ` Linus Torvalds
2014-04-22 7:34 ` Peter Zijlstra
2014-04-22 7:34 ` Peter Zijlstra
2014-04-22 7:54 ` Peter Zijlstra
2014-04-22 7:54 ` Peter Zijlstra
2014-04-22 21:36 ` Linus Torvalds
2014-04-22 21:36 ` Linus Torvalds
2014-04-22 21:46 ` Dave Hansen
2014-04-22 21:46 ` Dave Hansen
2014-04-22 22:08 ` Linus Torvalds
2014-04-22 22:08 ` Linus Torvalds
2014-04-22 22:41 ` Dave Hansen
2014-04-22 22:41 ` Dave Hansen
2014-04-23 2:44 ` Linus Torvalds
2014-04-23 2:44 ` Linus Torvalds
2014-04-23 3:08 ` Hugh Dickins
2014-04-23 3:08 ` Hugh Dickins
2014-04-23 3:08 ` Hugh Dickins
2014-04-23 4:23 ` Linus Torvalds
2014-04-23 4:23 ` Linus Torvalds
2014-04-23 6:14 ` Benjamin Herrenschmidt
2014-04-23 6:14 ` Benjamin Herrenschmidt
2014-04-23 18:41 ` Jan Kara
2014-04-23 18:41 ` Jan Kara
2014-04-23 19:33 ` Linus Torvalds
2014-04-24 6:51 ` Peter Zijlstra
2014-04-24 6:51 ` Peter Zijlstra
2014-04-24 18:40 ` Hugh Dickins
2014-04-24 18:40 ` Hugh Dickins
2014-04-24 19:45 ` Linus Torvalds
2014-04-24 19:45 ` Linus Torvalds
2014-04-24 20:02 ` Hugh Dickins
2014-04-24 20:02 ` Hugh Dickins
2014-04-24 23:46 ` Linus Torvalds
2014-04-25 1:37 ` Benjamin Herrenschmidt
2014-04-25 1:37 ` Benjamin Herrenschmidt
2014-04-25 2:41 ` Benjamin Herrenschmidt [this message]
2014-04-25 2:46 ` Linus Torvalds
2014-04-25 2:46 ` Linus Torvalds
2014-04-25 2:50 ` H. Peter Anvin
2014-04-25 2:50 ` H. Peter Anvin
2014-04-25 2:50 ` H. Peter Anvin
2014-04-25 3:03 ` Linus Torvalds
2014-04-25 3:03 ` Linus Torvalds
2014-04-25 12:01 ` Hugh Dickins
2014-04-25 12:01 ` Hugh Dickins
2014-04-25 13:51 ` Peter Zijlstra
2014-04-25 13:51 ` Peter Zijlstra
2014-04-25 19:41 ` Hugh Dickins
2014-04-25 19:41 ` Hugh Dickins
2014-04-26 18:07 ` Peter Zijlstra
2014-04-26 18:07 ` Peter Zijlstra
2014-04-27 7:20 ` Peter Zijlstra
2014-04-27 7:20 ` Peter Zijlstra
2014-04-27 12:20 ` Hugh Dickins
2014-04-27 12:20 ` Hugh Dickins
2014-04-27 19:33 ` Peter Zijlstra
2014-04-27 19:33 ` Peter Zijlstra
2014-04-27 19:47 ` Linus Torvalds
2014-04-27 19:47 ` Linus Torvalds
2014-04-27 20:09 ` Hugh Dickins
2014-04-27 20:09 ` Hugh Dickins
2014-04-28 9:25 ` Peter Zijlstra
2014-04-28 9:25 ` Peter Zijlstra
2014-04-28 10:14 ` Peter Zijlstra
2014-04-28 10:14 ` Peter Zijlstra
2014-04-27 16:21 ` Linus Torvalds
2014-04-27 16:21 ` Linus Torvalds
2014-04-27 23:13 ` Benjamin Herrenschmidt
2014-04-25 16:54 ` Dave Hansen
2014-04-25 16:54 ` Dave Hansen
2014-04-25 16:54 ` Dave Hansen
2014-04-25 18:41 ` Hugh Dickins
2014-04-25 18:41 ` Hugh Dickins
2014-04-25 22:00 ` Dave Hansen
2014-04-25 22:00 ` Dave Hansen
2014-04-25 22:00 ` Dave Hansen
2014-04-26 3:11 ` Hugh Dickins
2014-04-26 3:11 ` Hugh Dickins
2014-04-26 3:48 ` Linus Torvalds
2014-04-26 3:48 ` Linus Torvalds
2014-04-25 17:56 ` Linus Torvalds
2014-04-25 17:56 ` Linus Torvalds
2014-04-25 19:13 ` Hugh Dickins
2014-04-25 19:13 ` Hugh Dickins
2014-04-25 16:30 ` Dave Hansen
2014-04-25 16:30 ` Dave Hansen
2014-04-25 16:30 ` Dave Hansen
2014-04-23 20:11 ` Hugh Dickins
2014-04-23 20:11 ` Hugh Dickins
2014-04-24 8:49 ` Jan Kara
2014-04-24 8:49 ` Jan Kara
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