(Added Lennart to the discussion so he can help explaining how systemd will
use the xattrs)
On Fri, Jul 20, 2012 at 11:04:59AM -0700, Tejun Heo wrote:
> Hello, Hugh, Aristeu.
>
> On Fri, Jul 20, 2012 at 01:59:59PM -0400, Aristeu Rozanski wrote:
> > hm, not sure that's what Tejun meant. tmpfs uses
On Tue, Jul 24, 2012 at 11:28:09AM -0700, Tejun Heo wrote:
> On Mon, Jul 23, 2012 at 02:12:52PM -0400, Aristeu Rozanski wrote:
> > > Will "lsattr -R" in the cgroupfs mountpoint do enough to judge how
> > > much memory is being used in this way? I expect not, but I'm
> > > unfamliar with it: you ma
Hello,
On Mon, Jul 23, 2012 at 02:12:52PM -0400, Aristeu Rozanski wrote:
> > Will "lsattr -R" in the cgroupfs mountpoint do enough to judge how
> > much memory is being used in this way? I expect not, but I'm
> > unfamliar with it: you may need to show counts elsewhere.
>
> that's for ext{2,3,4}
On Sun, Jul 22, 2012 at 12:12:07PM -0700, Hugh Dickins wrote:
> Please, do not do this.
>
> It may be fun to implement, but not to review and maintain.
>
> If we're going to start supporting swappable kernel memory, tmpfs
> xattrs is not the right place to start, and libfs xattrs certainly not:
>
On Fri, 20 Jul 2012, Aristeu Rozanski wrote:
> On Wed, Jul 18, 2012 at 06:11:32PM -0700, Hugh Dickins wrote:
> > > But why do we need something completely new? Can't we hijack some
> > > inodes used by tmpfs and use them for xattr storage? ie. Would it be
> > > difficult to use tmpfs as backend s
Hello, Hugh.
On Wed, Jul 18, 2012 at 06:11:32PM -0700, Hugh Dickins wrote:
> So systemd is already doing it as I suggested, but finds that awkward in
> some respects, and wants more help from the kernel in synchronization.
Yeah, pretty much.
> Stuffing an unbounded amount of data into cgroupfs x
Hello, Hugh, Aristeu.
On Fri, Jul 20, 2012 at 01:59:59PM -0400, Aristeu Rozanski wrote:
> hm, not sure that's what Tejun meant. tmpfs uses anonymous memory for the file
> contents, so reuse that infrastructure to allocate space for the extended
> attributes the same way, instead of using kmem.
>
Hugh,
On Wed, Jul 18, 2012 at 06:11:32PM -0700, Hugh Dickins wrote:
> > But why do we need something completely new? Can't we hijack some
> > inodes used by tmpfs and use them for xattr storage? ie. Would it be
> > difficult to use tmpfs as backend storage for on-memory xattr? With
> > that, we
On Wed, 18 Jul 2012, Tejun Heo wrote:
> On Wed, Jul 18, 2012 at 01:02:03PM -0700, Hugh Dickins wrote:
> > > I don't know. I
> > > really hope it used anonymous page cache instead of kmem tho. Hugh,
> > > would something like that be difficult?
> >
> > Yes, it would be difficult.
> >
> > You don
Hello, Hugh.
On Wed, Jul 18, 2012 at 01:02:03PM -0700, Hugh Dickins wrote:
> > I don't know. I
> > really hope it used anonymous page cache instead of kmem tho. Hugh,
> > would something like that be difficult?
>
> Yes, it would be difficult.
>
> You don't use the word "swappable", but I take
On Tue, 17 Jul 2012, Tejun Heo wrote:
> On Mon, Jul 02, 2012 at 10:29:25AM -0400, Aristeu Rozanski wrote:
> > This series are a refreshed version of a patchset submitted by Li Zefan back
> > in march:
> > https://lkml.org/lkml/2012/3/1/13
> >
> > With Li's permission, I refreshed the patches t
Hello,
On Mon, Jul 02, 2012 at 10:29:25AM -0400, Aristeu Rozanski wrote:
> This series are a refreshed version of a patchset submitted by Li Zefan back
> in march:
> https://lkml.org/lkml/2012/3/1/13
>
> With Li's permission, I refreshed the patches to apply over the latest
> upstream
> an
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