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Groups > linux.kernel > #1230545 > unrolled thread
| Started by | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| First post | 2015-09-22 19:50 +0200 |
| Last post | 2015-09-22 20:10 +0200 |
| Articles | 2 — 2 participants |
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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
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Date | 2015-09-22 19:50 +0200 |
| Subject | Re: [PATCH 01/11] x86/mm/pat: Don't free PGD entries on memory unmap |
| Message-ID | <qbzRw-3UF-17@gated-at.bofh.it> |
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.
Linus
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| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Date | 2015-09-22 20:10 +0200 |
| Message-ID | <qbAaU-4xo-99@gated-at.bofh.it> |
| In reply to | #1230545 |
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/
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