Messages in this thread Patch in this message | | | Date | Thu, 17 Mar 2016 13:41:56 +0000 | From | Chris Wilson <> | Subject | Re: [PATCH v2] mm/vmap: Add a notifier for when we run out of vmap address space |
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On Thu, Mar 17, 2016 at 01:34:59PM +0000, Chris Wilson wrote: > vmaps are temporary kernel mappings that may be of long duration. > Reusing a vmap on an object is preferrable for a driver as the cost of > setting up the vmap can otherwise dominate the operation on the object. > However, the vmap address space is rather limited on 32bit systems and > so we add a notification for vmap pressure in order for the driver to > release any cached vmappings. > > The interface is styled after the oom-notifier where the callees are > passed a pointer to an unsigned long counter for them to indicate if they > have freed any space. > > v2: Guard the blocking notifier call with gfpflags_allow_blocking() > > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: David Rientjes <rientjes@google.com> > Cc: Roman Peniaev <r.peniaev@gmail.com> > Cc: Mel Gorman <mgorman@techsingularity.net> > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > --- > include/linux/vmalloc.h | 4 ++++ > mm/vmalloc.c | 27 +++++++++++++++++++++++++++ > 2 files changed, 31 insertions(+) > > diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h > index d1f1d338af20..edd676b8e112 100644 > --- a/include/linux/vmalloc.h > +++ b/include/linux/vmalloc.h > @@ -187,4 +187,8 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) > #define VMALLOC_TOTAL 0UL > #endif > > +struct notitifer_block; Omg. /o\ -Chris
-- Chris Wilson, Intel Open Source Technology Centre
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