Re: [PATCH RFC] x86: enforce inlining for atomics

[Hagen Paul Pfeifer]

On 20 April 2015 at 23:56, Borislav Petkov <bp@xxxxxxxxx> wrote:

> Hmm, that must be config-specific as doing
>
> objdump -D vmlinux | grep -i "atomic_add"
>
> here gives me only "drm_atomic_add_affected_connectors" matches.
>
> It probably gets inlined here always...

Probably, the config is allyesconfig minus trace/kernel adress
sanitizer and gcov related options.

> Other than that, this patch should actually even show some speedup as
> we're getting rid of the stack preparation and function call overhead.
> Have you done any benchmarks with it?

No, but I am sure that a benchmark should show at least theoretically
better perf numbers. But the numbers should be the measurement
uncertainty range. The avoided cache line miss should be the greatest
perf effect.

Hagen
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