On Tuesday 28 August 2007 01:10, Fengguang Wu wrote:
> > > There is a nice LWN article on this issue:
> > > ELC: How much memory are applications really using?
> > > http://lwn.net/Articles/230975/
> > >
> > > Another helpful patch could be:
> > > maps: PSS(proportional set size) accounting in smaps
> > > http://lkml.org/lkml/2007/8/19/23
> > Thanks a lot, very useful pages indeed.
> > However they still don't explain how I can avoid counting memory
> > twice for /proc/PID1 and /proc/PID2 when PID2 is a child of PID1,
> > created with CLONE_VM.
> > The example: I allocate 1234k, dirty it, then clone with CLONE_VM.
> > I will seemingly have two processes, each using 1234k, _privately_
> > (i.e., pages are not shown as shared in smaps) -
> > which is technically correct, pages are not shared with other VMs,
> > but they ARE shared by means of these two processes having the same VM!
> > How userspace tools can figure out that these processes have shared VM?
> > IOW: do we need "VMsharecount: N" in addition to "Threads: N"
> > in /proc/PID/status?
> A full solution would require two parameters, i.e. VmUsers/VmMagic.
> But please make sure the new lines won't break important tools like
Should be safe - tools skip lines they do not recognize.
Ok, we have "Threads: N".
I can cook up a patch which adds count of processes
which share VM with us - it's just atomic_read(¤t->mm->mm_users).
What name do you like?
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