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From 905f778dc295ad5d934fed6fd5f2742c2123dbcd Mon Sep 17 00:00:00 2001
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From: Arnaldo Carvalho de Melo <acme@redhat.com>
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Date: Wed, 10 Jun 2015 19:38:18 -0300
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Subject: [PATCH 2/7] pidstat: Add PF_NO_SETAFFINITY const
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For the stat flag that means that userland is not allowed to meddle with
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cpus_allowed, i.e. with the thread's smp affinity, via
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sched_setaffinity.
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This indeed has the same value as PF_THREAD_BOUND, see the kernel
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sources for an explanation, but basically was in this cset:
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commit 14a40ffccd6163bbcd1d6f32b28a88ffe6149fc6
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Author: Tejun Heo <tj@kernel.org>
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Date: Tue Mar 19 13:45:20 2013 -0700
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sched: replace PF_THREAD_BOUND with PF_NO_SETAFFINITY
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PF_THREAD_BOUND was originally used to mark kernel threads which
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were bound to a specific CPU using kthread_bind() and a task with
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the flag set allows cpus_allowed modifications only to itself.
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Workqueue is currently abusing it to prevent userland from meddling
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with cpus_allowed of workqueue workers.
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---------------------------------------------------------------
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So add the new const but keep the old one, we may have some tool out
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there using it.
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Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Signed-off-by: John Kacur <jkacur@redhat.com>
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---
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procfs/procfs.py | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/procfs/procfs.py b/procfs/procfs.py
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index 0dbf7f5b7da5..4ff7e9804bc9 100755
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--- a/procfs/procfs.py
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+++ b/procfs/procfs.py
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@@ -2,7 +2,7 @@
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# -*- python -*-
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# -*- coding: utf-8 -*-
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#
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-# Copyright (C) 2007 Red Hat, Inc.
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+# Copyright (C) 2007-2015 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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@@ -54,6 +54,7 @@ class pidstat:
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PF_SPREAD_PAGE = 0x01000000
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PF_SPREAD_SLAB = 0x02000000
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PF_THREAD_BOUND = 0x04000000
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+ PF_NO_SETAFFINITY = 0x04000000 # /* Userland is not allowed to meddle with cpus_allowed */
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PF_MEMPOLICY = 0x10000000
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PF_MUTEX_TESTER = 0x20000000
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PF_FREEZER_SKIP = 0x40000000
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--
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1.8.3.1
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