Messages in this thread | | | Date | Wed, 6 Aug 2008 10:24:00 +0200 | From | Andreas Herrmann <> | Subject | [PATCH 0/2] x86: fix memory leaks when doing CPU hotplug |
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Following patches fix two memory leaks with CPU hotplug. Some per CPU data is allocated each time a CPU is set online. But this space is never freed.
Usually this memory leak is not a big deal (for normal CPU hotplug usage). But during stress tests with lots of CPU offline/online cycles this really matters.
The entire leak is 40K (10 pages) for each offline/online cycle per CPU. I've verified both fixes performing more than 90000 CPU offline/online cycles.
This is not a regression but I think it's still 2.6.27 material. Please apply.
Regards,
Andreas
BTW, there is still a leak of about 600 bytes per offline/online cycle per CPU -- according to slabinfo this might be sysfs related. The most suspicious entries are:
Name Objects Objsize Space Slabs/Part/Cpu O/S O %Fr %Ef Flg sysfs_dir_cache 266085 80 41.9M 10235/4/0 26 0 0 50 PZFU kmalloc-8 130870 8 10.5M 2568/5/0 51 0 0 9 PZFU
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