On 2013-05-29 13:32:23 -0400, Johannes Weiner wrote:
> On Wed, May 29, 2013 at 04:53:12PM +0200, Andres Freund wrote:
> > On 2013-02-16 14:53:43 +1030, Rusty Russell wrote:
> > > Andrew Morton writes:
> > > > On Fri, 15 Feb 2013 18:13:04 -0500
> > > > Johannes Weiner wrote:
> > > >> I dunno. The
On Wed, May 29, 2013 at 04:53:12PM +0200, Andres Freund wrote:
> On 2013-02-16 14:53:43 +1030, Rusty Russell wrote:
> > Andrew Morton writes:
> > > On Fri, 15 Feb 2013 18:13:04 -0500
> > > Johannes Weiner wrote:
> > >> I dunno. The byte vector might not be optimal but its worst cases
> > >> seem
On 2013-02-16 14:53:43 +1030, Rusty Russell wrote:
> Andrew Morton writes:
> > On Fri, 15 Feb 2013 18:13:04 -0500
> > Johannes Weiner wrote:
> >> I dunno. The byte vector might not be optimal but its worst cases
> >> seem more attractive, is just as extensible, and dead simple to use.
> >
> > Bu
From: Johannes Weiner
Subject: [patch 1/2] mm: fincore()
Provide a syscall to determine whether a given file's pages are cached
in memory. This is more elegant than mmapping the file for the sole
purpose of using mincore(), and also works on NOMMU.
Who is the user of mincore()/fincore()
Andrew Morton writes:
> The syscall should handle the common usages very well. But it
> shouldn't handle uncommon usages very badly!
If the user is actually dealing with the contents of the file, following
the established mincore is preferred, since it's in the noise anyway.
Which comes back to
On Sat, 16 Feb 2013 14:53:43 +1030 Rusty Russell wrote:
> Andrew Morton writes:
> > On Fri, 15 Feb 2013 18:13:04 -0500
> > Johannes Weiner wrote:
> >> I dunno. The byte vector might not be optimal but its worst cases
> >> seem more attractive, is just as extensible, and dead simple to use.
> >
On Sat, Feb 16, 2013 at 02:53:43PM +1030, Rusty Russell wrote:
> Andrew Morton writes:
> > On Fri, 15 Feb 2013 18:13:04 -0500
> > Johannes Weiner wrote:
> >> I dunno. The byte vector might not be optimal but its worst cases
> >> seem more attractive, is just as extensible, and dead simple to use
Andrew Morton writes:
> On Fri, 15 Feb 2013 18:13:04 -0500
> Johannes Weiner wrote:
>> I dunno. The byte vector might not be optimal but its worst cases
>> seem more attractive, is just as extensible, and dead simple to use.
>
> But I think "which pages from this 4TB file are in core" will not b
On Fri, 15 Feb 2013 18:13:04 -0500
Johannes Weiner wrote:
> On Fri, Feb 15, 2013 at 01:27:38PM -0800, Andrew Morton wrote:
> > On Fri, 15 Feb 2013 01:34:50 -0500
> > Johannes Weiner wrote:
> >
> > > + * The status is returned in a vector of bytes. The least significant
> > > + * bit of each by
On Fri, Feb 15, 2013 at 01:27:38PM -0800, Andrew Morton wrote:
> On Fri, 15 Feb 2013 01:34:50 -0500
> Johannes Weiner wrote:
>
> > + * The status is returned in a vector of bytes. The least significant
> > + * bit of each byte is 1 if the referenced page is in memory, otherwise
> > + * it is zer
On Fri, 15 Feb 2013 17:28:03 -0500
Johannes Weiner wrote:
> > Yes, and there will be immediate calmour to add more goodies to the
> > other seven bits. PageDirty, referenced state, etc. We should think
> > about this now, at the design stage rather than grafting things on
> > later.
>
> I'm in
On Fri, Feb 15, 2013 at 01:14:51PM -0800, Andrew Morton wrote:
> On Fri, 15 Feb 2013 01:34:50 -0500
> Johannes Weiner wrote:
>
> > On Mon, Feb 11, 2013 at 02:12:39PM -0800, Andrew Morton wrote:
> > > Also, having to mmap the file to be able to query pagecache state is a
> > > hack. Whatever happ
On Fri, 15 Feb 2013 01:34:50 -0500
Johannes Weiner wrote:
> + * The status is returned in a vector of bytes. The least significant
> + * bit of each byte is 1 if the referenced page is in memory, otherwise
> + * it is zero.
Also, this is going to be dreadfully inefficient for some obvious cases
On Fri, 15 Feb 2013 01:34:50 -0500
Johannes Weiner wrote:
> On Mon, Feb 11, 2013 at 02:12:39PM -0800, Andrew Morton wrote:
> > Also, having to mmap the file to be able to query pagecache state is a
> > hack. Whatever happened to the fincore() patch?
>
> I don't know, but how about this one:
Th
From: Johannes Weiner
Date: Fri, 15 Feb 2013 01:34:50 -0500
> + nr_pages = DIV_ROUND_UP(len, PAGE_CACHE_SIZE);
A small nit, maybe use PAGE_CACHE_ALIGN() here.
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On Mon, Feb 11, 2013 at 02:12:39PM -0800, Andrew Morton wrote:
> Also, having to mmap the file to be able to query pagecache state is a
> hack. Whatever happened to the fincore() patch?
I don't know, but how about this one:
---
From: Johannes Weiner
Subject: [patch 1/2] mm: fincore
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