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Commit 0800fc3a authored by Sudarshan Rajagopalan's avatar Sudarshan Rajagopalan Committed by Gerrit - the friendly Code Review server
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mm/memory_hotplug: Reduce migration re-try timeout value 



Currently, the timeout value for migration re-tries during
memory offlining is 120 seconds. If migration encounters a
pinned page, it is guaranteed to fail no matter how many
re-tries are attempted, and there is much CPU cycles spent
on the re-tries with this timeout, which would contribute
to power. Hence, reduce the timeout to half, 60 seconds.

Change-Id: Ib300c4c1c3c4f5d10f5d8652d04a783c0f459fc1
Signed-off-by: default avatarSudarshan Rajagopalan <sudaraja@codeaurora.org>
parent 21ef7b06

include/linux/memory_hotplug.h

+3 −0
Original line number Diff line number Diff line
@@ -14,6 +14,9 @@ struct mem_section; 
struct memory_block;

struct resource;



/* Timeout for migration re-tries in seconds */

#define MIGRATE_TIMEOUT_SEC		60



#ifdef CONFIG_MEMORY_HOTPLUG

/*

 * Return page for the valid pfn only if the page is online. All pfn

mm/memory_hotplug.c

+2 −1
Original line number Diff line number Diff line
@@ -1766,7 +1766,8 @@ static int __ref __offline_pages(unsigned long start_pfn, 
/* Must be protected by mem_hotplug_begin() or a device_lock */

int offline_pages(unsigned long start_pfn, unsigned long nr_pages)

{

	return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);

	return __offline_pages(start_pfn, start_pfn + nr_pages,

						MIGRATE_TIMEOUT_SEC * HZ);

}

#endif /* CONFIG_MEMORY_HOTREMOVE */