• Rafael J. Wysocki's avatar
    freezer: fix vfork problem · ba96a0c8
    Rafael J. Wysocki authored
    Currently try_to_freeze_tasks() has to wait until all of the vforked processes
    exit and for this reason every user can make it fail.  To fix this problem we
    can introduce the additional process flag PF_FREEZER_SKIP to be used by tasks
    that do not want to be counted as freezable by the freezer and want to have
    TIF_FREEZE set nevertheless.  Then, this flag can be set by tasks using
    sys_vfork() before they call wait_for_completion(&vfork) and cleared after
    they have woken up.  After clearing it, the tasks should call try_to_freeze()
    as soon as possible.
    Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
    Cc: Gautham R Shenoy <ego@in.ibm.com>
    Cc: Oleg Nesterov <oleg@tv-sign.ru>
    Cc: Pavel Machek <pavel@ucw.cz>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    ba96a0c8
process.c 4.62 KB