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

[Eric Dumazet]

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.