RE: [perfmon2] [PATCH] perf_events: improve DS/BTS/PEBS bufferallocation

[Luck, Tony]

> I am not aware of any real technical issues, except that
> it needs to be done for both 32bit and 64bit.

Some good documentation on when you need vmalloc_sync_all(), and
why most places don't need it would help to avoid a surge of
patches spraying calls to it all over the kernel.

-Tony
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