Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1534134

Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy
Date 2016-12-01 15:20 +0100
Message-ID <sJAno-4Xx-17@gated-at.bofh.it> (permalink)
References (4 earlier) <sJjcR-1U1-9@gated-at.bofh.it> <sJjwe-2hE-9@gated-at.bofh.it> <sJtOV-G5-5@gated-at.bofh.it> <sJtYC-Ja-9@gated-at.bofh.it> <sJuhX-PI-23@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

Let's also CC Marek

On Thu 01-12-16 08:43:40, Vlastimil Babka wrote:
> On 12/01/2016 08:21 AM, Michal Hocko wrote:
> > Forgot to CC Joonsoo. The email thread starts more or less here
> > http://lkml.kernel.org/r/20161130092239.GD18437@dhcp22.suse.cz
> > 
> > On Thu 01-12-16 08:15:07, Michal Hocko wrote:
> > > On Wed 30-11-16 20:19:03, Robin H. Johnson wrote:
> > > [...]
> > > > alloc_contig_range: [83f2a3, 83f2a4) PFNs busy
> > > 
> > > Huh, do I get it right that the request was for a _single_ page? Why do
> > > we need CMA for that?
> 
> Ugh, good point. I assumed that was just the PFNs that it failed to migrate
> away, but it seems that's indeed the whole requested range. Yeah sounds some
> part of the dma-cma chain could be smarter and attempt CMA only for e.g.
> costly orders.

Is there any reason why the DMA api doesn't try the page allocator first
before falling back to the CMA? I simply have a hard time to see why the
CMA should be used (and fragment) for small requests size.
-- 
Michal Hocko
SUSE Labs

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

Thread

PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs busy "Robin H. Johnson" <robbat2@orbis-terrarum.net> - 2016-11-29 23:50 +0100
  Re: PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs  busy Michal Hocko <mhocko@kernel.org> - 2016-11-30 10:30 +0100
    Re: PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs busy Michal Nazarewicz <mina86@mina86.com> - 2016-11-30 14:10 +0100
      Re: PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs  busy Michal Hocko <mhocko@kernel.org> - 2016-11-30 14:30 +0100
        Re: PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs  busy "Robin H. Johnson" <robbat2@gentoo.org> - 2016-11-30 21:00 +0100
          drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy "Robin H. Johnson" <robbat2@gentoo.org> - 2016-11-30 21:20 +0100
            Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Vlastimil Babka <vbabka@suse.cz> - 2016-11-30 22:30 +0100
              Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy "Robin H. Johnson" <robbat2@gentoo.org> - 2016-12-01 07:30 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Vlastimil Babka <vbabka@suse.cz> - 2016-12-01 08:40 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy "Robin H. Johnson" <robbat2@gentoo.org> - 2016-12-01 09:00 +0100
            Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Hocko <mhocko@kernel.org> - 2016-12-01 08:20 +0100
              Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Hocko <mhocko@kernel.org> - 2016-12-01 08:30 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Vlastimil Babka <vbabka@suse.cz> - 2016-12-01 08:50 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Hocko <mhocko@kernel.org> - 2016-12-01 15:20 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Nazarewicz <mina86@mina86.com> - 2016-12-01 17:10 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Hocko <mhocko@kernel.org> - 2016-12-01 17:20 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Michal Nazarewicz <mina86@mina86.com> - 2016-12-01 22:10 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Vlastimil Babka <vbabka@suse.cz> - 2016-12-02 07:40 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy  busy Lucas Stach <l.stach@pengutronix.de> - 2016-12-02 11:30 +0100
                Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy Jerome Glisse <j.glisse@gmail.com> - 2016-12-02 16:20 +0100
          Re: PROBLEM-PERSISTS: dmesg spam: alloc_contig_range: [XX, YY) PFNs busy Michal Nazarewicz <mina86@mina86.com> - 2016-12-01 02:40 +0100

csiph-web