Commit 86dd995d authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Linus Torvalds

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: default avatarVitaly 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8604d9e5
...@@ -2161,6 +2161,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. ...@@ -2161,6 +2161,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
[KNL,SH] Allow user to override the default size for [KNL,SH] Allow user to override the default size for
per-device physically contiguous DMA buffers. per-device physically contiguous DMA buffers.
memhp_default_state=online/offline
[KNL] Set the initial state for the memory hotplug
onlining policy. If not specified, the default value is
set according to the
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE kernel config
option.
See Documentation/memory-hotplug.txt.
memmap=exactmap [KNL,X86] Enable setting of an exact memmap=exactmap [KNL,X86] Enable setting of an exact
E820 memory map, as specified by the user. E820 memory map, as specified by the user.
Such memmap=exactmap lines can be constructed based on Such memmap=exactmap lines can be constructed based on
......
...@@ -85,6 +85,17 @@ bool memhp_auto_online = true; ...@@ -85,6 +85,17 @@ bool memhp_auto_online = true;
#endif #endif
EXPORT_SYMBOL_GPL(memhp_auto_online); 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) void get_online_mems(void)
{ {
might_sleep(); might_sleep();
......
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