[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support |
Date: |
Fri, 12 Mar 2010 16:04:03 +0000 |
User-agent: |
KMail/1.12.4 (Linux/2.6.32-trunk-amd64; KDE/4.3.4; x86_64; ; ) |
> > > $ cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size
> > > 2097152
> >
> > Is "pmd" x86 specific?
>
> It's linux specific, this is common code, nothing x86 specific. In
> fact on x86 it's not called pmd but Page Directory. I've actually no
> idea what pmd stands for but it's definitely not x86 specific and it's
> just about the linux common code common to all archs. The reason this
> is called hpage_pmd_size is because it's a #define HPAGE_PMD_SIZE in
> the kernel code. So this entirely match the kernel internals
> _common_code_.
Hmm, ok. I'm guessing linux doesn't support anything other than "huge" and
"normal" page sizes now, so it's a question of whether we want it to expose
current implementation details, or say "Align big in-memory things this much
for optimal TLB behavior".
Paul
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, (continued)
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Avi Kivity, 2010/03/11
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/11
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/11
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/11
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/11
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support,
Paul Brook <=
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Paul Brook, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Andrea Arcangeli, 2010/03/12
- Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support, Jamie Lokier, 2010/03/12