Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap

From	Andy Lutomirski <luto@amacapital.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap
Date	2015-09-22 20:10 +0200
Message-ID	<qbAaU-4xo-99@gated-at.bofh.it> (permalink)
References	<qbpfr-5Ff-1@gated-at.bofh.it> <qbpfs-5Ff-29@gated-at.bofh.it> <qbzRw-3UF-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Tue, Sep 22, 2015 at 10:41 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@kernel.org> wrote:
>>
>> This complicates PGD management, so don't do this. We can keep the
>> PGD mapped and the PUD table all clear - it's only a single 4K page
>> per 512 GB of memory mapped.
>
> I'm ok with this just from a "it removes code" standpoint.  That said,
> some of the other patches here make me go "hmm". I'll answer them
> separately.
>

If we want to get rid of vmalloc faults, then this patch makes it much
more obvious that it can be done without hurting performance.

>                   Linus



-- 
Andy Lutomirski
AMA Capital Management, LLC
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap Linus Torvalds <torvalds@linux-foundation.org> - 2015-09-22 19:50 +0200
  Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap Andy Lutomirski <luto@amacapital.net> - 2015-09-22 20:10 +0200

csiph-web