Re: [PATCH 07/15] mm: Add ___GFP_NOTRACE

[Steven Rostedt]

On Mon, 2 Mar 2015 11:24:04 -0800
Alexei Starovoitov <ast@xxxxxxxxxxxx> wrote:
 
> well, percentage of tracepoints called from NMI is tiny
> comparing to the rest, so assuming nmi context
> everywhere is very inefficient.
> Like we can use pre-allocated pool of map entries when
> tracepoint is called from NMI, but we shouldn't be using
> it in other cases. Just like ring buffers and other things
> have nmi and non-nmi pools and code paths, it doesn't
> make sense to disallow kmalloc all together.
> btw, calling kmalloc is _faster_ than taking
> objects from cache-cold special nmi only pool.

Please show the numbers and post the tests when stating something like
that.

-- Steve

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