linux-kernel - [PATCH 0/2] introduce for_each_process_thread_break() and for_each_process_thread

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Message-ID: <20180912163312.GA18739@redhat.com>
Date:   Wed, 12 Sep 2018 18:33:12 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] introduce for_each_process_thread_break() and
 for_each_process_thread_continue()

Resend.

IMHO this makes sense anyway, but mostly this is preparation for other changes.
show_state_filter() and other "slow" users of for_each_process() can livelock
and even trigger hard lockups.

Peter, you have already reviewed at least 1/2 (heh, two years ago) and iirc
you were mostly agree but pointed out that for_each_xxx() in _continue() could
be SPEND_TOO_MUCH_TIME themselves. I added a note into the changelog.

Oleg.

 include/linux/sched/signal.h | 10 ++++++++++
 kernel/exit.c                | 42 ++++++++++++++++++++++++++++++++++++++++++
 kernel/hung_task.c           | 25 +++++++++----------------
 3 files changed, 61 insertions(+), 16 deletions(-)