On Mon, 25 Jan 2016, John Stultz wrote: > From: Ruchi Kandoi <[email protected]> > > This allows power/performance management software to set timer > slack for other threads according to its policy for the thread > (such as when the thread is designated foreground vs. background > activity) > > Second argument is similar to PR_SET_TIMERSLACK, if non-zero > then the slack is set to that value otherwise sets it to the > default for the thread. > > Takes PID of the thread as the third argument. > > This interface checks that the calling task has permissions to > to use PTRACE_MODE_ATTACH on the target task, so that we can > ensure arbitrary apps do not change the timer slack for other > apps. > > Additional fixes from Ruchi and Micha Kalfon <[email protected]> > have been folded into this patch to make it easier to reivew. > > Cc: Arjan van de Ven <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Oren Laadan <[email protected]> > Cc: Micha Kalfon <[email protected]> > Cc: Ruchi Kandoi <[email protected]> > Cc: Rom Lemarchand <[email protected]> > Cc: Android Kernel Team <[email protected]> > Signed-off-by: Ruchi Kandoi <[email protected]> > [jstultz: > * Folded in CAP_SYS_NICE check from Ruchi. > * Folded in fix misplaced PR_SET_TIMERSLACK_PID case fix from > Micha. > * Folded in make PR_SET_TIMERSLACK_PID pid namespace aware fix > from Micha. > * Changed PR_SET_TIMERSLACK_PID so it didn't collide with > already upstream prctrl values. > * Reworked commit message. > * Moved from CAP_SYS_NICE to PTRACE_MODE_ATTACH for permissions > checks] > Signed-off-by: John Stultz <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
