On Fri, Mar 05, 2021 at 04:18:36AM +, Matthew Wilcox (Oracle) wrote:
> Our type system does not currently distinguish between tail pages and
> head or single pages. This is a problem because we call compound_head()
> multiple times (and the compiler cannot optimise it out), bloating the
>
On Mon, Mar 15, 2021 at 07:40:14PM +, Matthew Wilcox wrote:
> The reason I didn't go with 'head' is that traditionally 'head' implies
> that there are tail pages. It would be weird to ask 'if (HeadHead(head))'
> That's currently spelled 'if (FolioMulti(folio))'. But it can be changed
> if
On Mon, Mar 15, 2021 at 07:40:14PM +, Matthew Wilcox wrote:
> I would agree that the conversion is both straightforward and noisy.
> There are some minor things that crop up, like noticing that we get
> the accounting wrong for writeback of compound pages. That's not
> entirely unexpected
Michal Hocko writes:
> bikeshedding) because it hasn't really resonated with the udnerlying
> concept. Maybe just me as a non native speaker... page_head would have
> been so much more straightforward but not something I really care
> about.
Yes. page_head explains exactly what it is.
But
On Mon, Mar 15, 2021 at 07:09:04PM +, Christoph Hellwig wrote:
> On Mon, Mar 15, 2021 at 01:38:04PM +0100, Michal Hocko wrote:
> > I tend to agree here as well. The level compoud_head has spread out
> > silently is just too large. There are people coming up with all sorts of
> > optimizations
On Mon, Mar 15, 2021 at 01:38:04PM +0100, Michal Hocko wrote:
> I tend to agree here as well. The level compoud_head has spread out
> silently is just too large. There are people coming up with all sorts of
> optimizations to workaround that, and they are quite right that this is
> somehing worth
On Mon, Mar 15, 2021 at 02:55:01PM +0300, Kirill A. Shutemov wrote:
> I'm with Matthew on this. I would really want to drop the number of places
> where we call compoud_head(). I hope we can get rid of the page flag
> policy hack I made.
I can't see that far ahead too clearly, but I do think that
On Mon 15-03-21 14:55:01, Kirill A. Shutemov wrote:
> On Sat, Mar 13, 2021 at 07:09:01PM -0800, Hugh Dickins wrote:
> > On Sat, 13 Mar 2021, Andrew Morton wrote:
> > > On Fri, 5 Mar 2021 04:18:36 + "Matthew Wilcox (Oracle)"
> > > wrote:
> > >
> > > > Our type system does not currently
On Sat, Mar 13, 2021 at 07:09:01PM -0800, Hugh Dickins wrote:
> On Sat, 13 Mar 2021, Andrew Morton wrote:
> > On Fri, 5 Mar 2021 04:18:36 + "Matthew Wilcox (Oracle)"
> > wrote:
> >
> > > Our type system does not currently distinguish between tail pages and
> > > head or single pages. This
On Sat, 13 Mar 2021, Andrew Morton wrote:
> On Fri, 5 Mar 2021 04:18:36 + "Matthew Wilcox (Oracle)"
> wrote:
>
> > Our type system does not currently distinguish between tail pages and
> > head or single pages. This is a problem because we call compound_head()
> > multiple times (and the
On Sat, Mar 13, 2021 at 12:36:58PM -0800, Andrew Morton wrote:
> On Fri, 5 Mar 2021 04:18:36 + "Matthew Wilcox (Oracle)"
> wrote:
>
> > Our type system does not currently distinguish between tail pages and
> > head or single pages. This is a problem because we call compound_head()
> >
On Fri, 5 Mar 2021 04:18:36 + "Matthew Wilcox (Oracle)"
wrote:
> Our type system does not currently distinguish between tail pages and
> head or single pages. This is a problem because we call compound_head()
> multiple times (and the compiler cannot optimise it out), bloating the
>
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