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From: Marcelo Tosatti <mtosatti@redhat.com>
To: Igor Mammedov <imammedo@redhat.com>
Cc: aarcange@redhat.com, peter.maydell@linaro.org, gleb@redhat.com,
	quintela@redhat.com, jan.kiszka@siemens.com,
	qemu-devel@nongnu.org, aliguori@amazon.com, pbonzini@redhat.com,
	afaerber@suse.de, rth@twiddle.net
Subject: Re: [Qemu-devel] [RFC PATCH] pc: align gpa<->hpa on 1GB boundary by splitting RAM on several regions
Date: Wed, 30 Oct 2013 17:03:46 -0200	[thread overview]
Message-ID: <20131030190346.GA19287@amt.cnet> (raw)
In-Reply-To: <20131030185129.GB18378@amt.cnet>

On Wed, Oct 30, 2013 at 04:51:29PM -0200, Marcelo Tosatti wrote:
> On Wed, Oct 30, 2013 at 05:49:49PM +0100, Igor Mammedov wrote:
> > On Tue, 29 Oct 2013 19:38:44 -0200
> > Marcelo Tosatti <mtosatti@redhat.com> wrote:
> > 
> > > On Tue, Oct 29, 2013 at 07:18:49PM +0100, Igor Mammedov wrote:
> > > > Otherwise 1GB TLBs cannot be cached for the range.
> > > 
> > > This fails to back non-1GB-aligned gpas, but 2MB aligned, with 2MB large
> > > pages.
> > With current command line only one hugetlbfs mount point is possible, so it
> > will back with whatever alignment specified hugetlbfs mount point has.
> > Anything that doesn't fit into page aligned region goes to tail using
> > non hugepage baked phys_mem_set_alloc()=qemu_anon_ram_alloc() allocator.
> 
> The patch you propose allocates the non-1GB aligned tail of RAM with 4k
> pages. As mentioned, this is not acceptable (2MB pages should be used
> whenever 1GB alignment is not possible).

Tail and 3-4GB region.

  reply	other threads:[~2013-10-30 19:04 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-24 21:11 [Qemu-devel] [patch 0/2] align >4GB guest RAM to a 1GB boundary, in case of 1GB-sized hugetlbfs Marcelo Tosatti
2013-10-24 21:11 ` [Qemu-devel] [patch 1/2] exec: add qemu_get_ram_hpagesize Marcelo Tosatti
2013-10-24 21:12 ` [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary Marcelo Tosatti
2013-10-24 21:55   ` Peter Maydell
2013-10-24 22:48     ` Marcelo Tosatti
2013-10-24 23:55   ` Paolo Bonzini
2013-10-25  4:58     ` Marcelo Tosatti
2013-10-25  8:52       ` Paolo Bonzini
2013-10-25 19:50         ` Marcelo Tosatti
2013-10-25 22:53           ` Paolo Bonzini
2013-10-30 11:07             ` Gerd Hoffmann
2013-10-30 11:47               ` Paolo Bonzini
2013-10-25  9:57       ` igor Mammedov
2013-10-25 13:34         ` Marcelo Tosatti
2013-10-27 15:20           ` igor Mammedov
2013-10-28 14:04             ` Marcelo Tosatti
2013-10-28 14:20               ` Marcelo Tosatti
2013-10-29 18:00               ` Igor Mammedov
2013-10-29 21:21                 ` Marcelo Tosatti
2013-10-30  8:48                   ` Gleb Natapov
2013-10-30 18:30                     ` Marcelo Tosatti
2013-10-29 18:18               ` [Qemu-devel] [RFC PATCH] pc: align gpa<->hpa on 1GB boundary by splitting RAM on several regions Igor Mammedov
2013-10-29 21:38                 ` Marcelo Tosatti
2013-10-30 16:49                   ` Igor Mammedov
2013-10-30 18:51                     ` Marcelo Tosatti
2013-10-30 19:03                       ` Marcelo Tosatti [this message]
2013-10-30 19:56                       ` Igor Mammedov
2013-10-30 23:44                         ` Marcelo Tosatti
2013-11-07 15:25                           ` Igor Mammedov
2013-10-30 19:31                     ` Marcelo Tosatti
2013-10-30 20:28                       ` Paolo Bonzini
2013-11-06  1:49   ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v2) Marcelo Tosatti
2013-11-06  1:55     ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v3) Marcelo Tosatti
2013-11-06 11:59       ` Igor Mammedov
2013-11-06 12:07         ` Paolo Bonzini
2013-11-06 12:22           ` Igor Mammedov
2013-11-06 12:24             ` Paolo Bonzini
2013-11-06 21:31       ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v4) Marcelo Tosatti
2013-11-06 21:40         ` Michael S. Tsirkin
2013-11-06 21:53           ` Marcelo Tosatti
2013-11-06 22:15             ` Michael S. Tsirkin
2013-11-06 22:24               ` Marcelo Tosatti
2013-11-07 15:24         ` Igor Mammedov
2013-11-07 21:53           ` Marcelo Tosatti
2013-11-10 20:47             ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v5) Marcelo Tosatti
2013-11-12 12:45               ` Igor Mammedov
2013-11-12 20:32                 ` Marcelo Tosatti
2013-11-12 21:16               ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v6) Marcelo Tosatti
2013-11-13 13:59                 ` Igor Mammedov
2013-11-13 17:13                 ` Paolo Bonzini
     [not found]                   ` <20131113195832.GA29433@amt.cnet>
2013-11-13 20:39                     ` Marcelo Tosatti
2013-11-13 21:49                       ` Paolo Bonzini
2013-11-13 19:08                 ` Michael S. Tsirkin

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