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Message-ID: <20230711174050.603820-1-david@redhat.com>
Date: Tue, 11 Jul 2023 19:40:50 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, linux-doc@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Michal Hocko <mhocko@...e.com>,
Oscar Salvador <osalvador@...e.de>,
Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v1] mm/memory_hotplug: document the signal_pending() check in offline_pages()
Let's update the documentation that any signal is sufficient, and
add a comment that not only checking for fatal signals is historical
baggage: changing it now could break existing user space. although
unlikely.
For example, when an app provides a custom SIGALRM handler and triggers
memory offlining, the timeout cmd would no longer stop memory offlining,
because SIGALRM would no longer be considered a fatal signal.
Cc: Michal Hocko <mhocko@...e.com>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Jonathan Corbet <corbet@....net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
Documentation/admin-guide/mm/memory-hotplug.rst | 2 +-
mm/memory_hotplug.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/mm/memory-hotplug.rst b/Documentation/admin-guide/mm/memory-hotplug.rst
index 1b02fe5807cc..bd77841041af 100644
--- a/Documentation/admin-guide/mm/memory-hotplug.rst
+++ b/Documentation/admin-guide/mm/memory-hotplug.rst
@@ -669,7 +669,7 @@ when still encountering permanently unmovable pages within ZONE_MOVABLE
(-> BUG), memory offlining will keep retrying until it eventually succeeds.
When offlining is triggered from user space, the offlining context can be
-terminated by sending a fatal signal. A timeout based offlining can easily be
+terminated by sending a signal. A timeout based offlining can easily be
implemented via::
% timeout $TIMEOUT offline_block | failure_handling
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3f231cf1b410..7cfd13c91568 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1843,6 +1843,11 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages,
do {
pfn = start_pfn;
do {
+ /*
+ * Historically we always checked for any signal and
+ * can't limit it to fatal signals without eventually
+ * breaking user space.
+ */
if (signal_pending(current)) {
ret = -EINTR;
reason = "signal backoff";
--
2.41.0
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