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    SubjectRe: [PATCH 1/2] Adds a read-only "procs" file similar to "tasks" that shows only unique tgids
    On Sat, 4 Jul 2009 09:10:58 -0700
    Paul Menage <menage@google.com> wrote:

    > 2009/7/3 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>:
    > > Anyway, above algorithm shows that it's enough to have per-cgroup bitmap
    > > (size can be dinamically changed) rather than big table and ugly sort().
    > > How about adding per-cgroup taskid bitmap ?
    > > clear/set is very easy.
    > >
    >
    > A per-cgroup bitmap of task ids would mean (assuming that it's
    > implemented as a sparse tree like an IDA) that you'd add extra
    > allocations and possible failure points in the fork path - right now
    > the fork overhead imposed by the cgroups framework itself is just
    > linking yourself into your parent's css_set and bumping its refcount.
    > I guess there probably are workloads where doing more work at
    > fork/exit time and less at "tasks" scan time is a win, but that has to
    > be balanced against those where fork/exit performance is more
    > critical, and the fact that it would be adding another way that fork
    > could fail.
    >
    ok.

    But "sorting" at procs file seems not sane ;)

    -Kame

    > Paul
    >



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