On 14/03/18 19:33, Matthew Wilcox wrote:
> I think an implementation of
> pmalloc which used a page_frag-style allocator would be larger than
> 100 lines, but I don't think it would have to be significantly larger
> than that.
I have some doubt about what is the best way to implement it using
vmal
On 14/03/2018 19:33, Matthew Wilcox wrote:
> On Wed, Mar 14, 2018 at 06:11:22PM +0200, Igor Stoppa wrote:
[...]
>> Probably page_frag does well with relatively large allocations, while
>> genalloc seems to be better for small (few allocation units) allocations.
>
> I don't understand why you w
On Wed, Mar 14, 2018 at 06:11:22PM +0200, Igor Stoppa wrote:
> On 14/03/18 15:04, Matthew Wilcox wrote:
> > but the principle it uses
> > seems like a better match to me than the rather complex genalloc.
>
> It uses meta data in a different way than genalloc.
> There is probably a tipping point wh
On 14/03/18 15:04, Matthew Wilcox wrote:
> I don't necessarily think you should use it as-is,
I think I simply cannot use it as-is, because it seems to use linear
memory, while I need virtual. This reason alone would require a rewrite
of several parts.
> but the principle it uses
> seems like
On Wed, Mar 14, 2018 at 02:55:10PM +0200, Igor Stoppa wrote:
> > The page_frag allocator seems like a much better place to
> > start than genalloc. It has a significantly lower overhead and is
> > much more suited to the kind of probably-identical-lifespan that the
> > pmalloc API is going to per
On 14/03/18 13:56, Matthew Wilcox wrote:
> On Wed, Mar 14, 2018 at 01:21:54PM +0200, Igor Stoppa wrote:
[...]
> You misread my proposal. I did not suggest storing the 'start', but the
> 'end'.
Ok, but doesn't that only change the race scenario?
Attempting to free one allocation, while it is
On Wed, Mar 14, 2018 at 01:21:54PM +0200, Igor Stoppa wrote:
> > * @Kees Cook proposed to turn the self testing into modules.
> > My answer was that the functionality is intentionally tested very early
> > in the boot phase, to prevent unexplainable errors, should the feature
> > really fail.
On 13/03/18 23:45, Igor Stoppa wrote:
[...]
Some more thoughts about the open topics:
> Discussion topics that are unclear if they are closed and would need
> comment from those who initiated them, if my answers are accepted or not:
>
> * @Kees Cook proposed to have first self testing for genal
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