Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH 0/3] ACPI / hotplug / mm: Rework mutual exclusion between hibernation and memory hotplug | Date | Thu, 29 Aug 2013 23:12:53 +0200 |
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Hi All,
One thing that bothers me quite a bit about memory hotplug is that lock_hotplug_memory() acquires pm_mutex which is kind of a blunt thing and has a huge potential for deadlocks.
This can be avoided if device_hotplug_lock is held around hibernation, which is not too difficult to make happen and hence the following patch series.
[1/3] ACPI: Acquire device_hotplug_lock before acpi_scan_lock (this is necessary, because hibernation acquires acpi_scan_lock in linux-next).
[2/3] PM / hibernate: Allocate memory bitmaps after freezing user space processes (the reason why is explained in the changelog).
[3/3] Rework mutual exclusion between hibernation and memory hotplug.
On top of linux-pm.git/linux-next.
Thanks, Rafael
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