Re: [PATCH v2] fs/select: add vmalloc fallback for select(2)

On Mon, 2016-09-26 at 17:01 -0700, Andrew Morton wrote:

I don't share Eric's concerns about performance here.  If the vmalloc()
is called, we're about to write to that quite large amount of memory
which we just allocated, and the vmalloc() overhead will be relatively
low.

I did not care of the performance of this particular select() system
call really, but other cpus because of more TLB invalidations.

At least CONFIG_DEBUG_PAGEALLOC=y builds should be impacted, but maybe
we do not care.


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