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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-05-20 03:13:06 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 05:12:14 +0300
commit86dd995d63241039e0ad9123f9b424013c611510 (patch)
treed3bee4d667fab9a57ff2a6d499fdb2916524ca05 /mm/memory_hotplug.c
parent8604d9e534a3e662600e288bcfd1a5acd2763d28 (diff)
downloadlinux-86dd995d63241039e0ad9123f9b424013c611510.tar.xz
memory_hotplug: introduce memhp_default_state= command line parameter
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE specifies the default value for the memory hotplug onlining policy. Add a command line parameter to make it possible to override the default. It may come handy for debug and testing purposes. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Dan Williams <dan.j.williams@intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Vrabel <david.vrabel@citrix.com> Cc: David Rientjes <rientjes@google.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Lennart Poettering <lennart@poettering.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index fcafbfcff044..caf2a14c37ad 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -85,6 +85,17 @@ bool memhp_auto_online = true;
#endif
EXPORT_SYMBOL_GPL(memhp_auto_online);
+static int __init setup_memhp_default_state(char *str)
+{
+ if (!strcmp(str, "online"))
+ memhp_auto_online = true;
+ else if (!strcmp(str, "offline"))
+ memhp_auto_online = false;
+
+ return 1;
+}
+__setup("memhp_default_state=", setup_memhp_default_state);
+
void get_online_mems(void)
{
might_sleep();