On Mon, Mar 25, 2019 at 12:34:59PM -0700, Chenbo Feng wrote:
[snip]
> > > > Also what is the benefit of having st_blocks from stat? AFAIK, that is
> > > > the
> > > > same as the buffer's size which does not change for the lifetime of the
> > > > buffer. In your patch you're doing this when 'struc
On Sun, Mar 24, 2019 at 1:45 PM Joel Fernandes wrote:
>
> Hi Sandeep,
>
> On Sun, Mar 24, 2019 at 10:56:33AM -0700, Sandeep Patil wrote:
> > On Fri, Mar 22, 2019 at 11:02:55AM -0400, Joel Fernandes wrote:
> > > On Thu, Mar 21, 2019 at 07:51:33PM -0700, Chenbo Feng wrote:
> > > > From: Greg Hackman
In the original userspace implementation Greg wrote, he was iterating
the directory entries in proc//map_files, doing readlink() on
each to find out whether the entry was a dmabuf. This turned out to be
very slow so we reworked it to parse proc//maps instead.
On Mon, Mar 25, 2019 at 12:35 PM Chen
Hi Sandeep,
On Sun, Mar 24, 2019 at 10:56:33AM -0700, Sandeep Patil wrote:
> On Fri, Mar 22, 2019 at 11:02:55AM -0400, Joel Fernandes wrote:
> > On Thu, Mar 21, 2019 at 07:51:33PM -0700, Chenbo Feng wrote:
> > > From: Greg Hackmann
> > >
> > > By traversing /proc/*/fd and /proc/*/map_files, proc
On Thu, Mar 21, 2019 at 07:51:33PM -0700, Chenbo Feng wrote:
> From: Greg Hackmann
>
> By traversing /proc/*/fd and /proc/*/map_files, processes with CAP_ADMIN
> can get a lot of fine-grained data about how shmem buffers are shared
> among processes. stat(2) on each entry gives the caller a uniq
On Fri, Mar 22, 2019 at 11:02:55AM -0400, Joel Fernandes wrote:
> On Thu, Mar 21, 2019 at 07:51:33PM -0700, Chenbo Feng wrote:
> > From: Greg Hackmann
> >
> > By traversing /proc/*/fd and /proc/*/map_files, processes with CAP_ADMIN
> > can get a lot of fine-grained data about how shmem buffers ar
From: Greg Hackmann
By traversing /proc/*/fd and /proc/*/map_files, processes with CAP_ADMIN
can get a lot of fine-grained data about how shmem buffers are shared
among processes. stat(2) on each entry gives the caller a unique
ID (st_ino), the buffer's size (st_size), and even the number of pag
