Re: [PATCH 2/6] x86: bug: prevent gcc distortions

[Nadav Amit]

Borislav Petkov <bp@xxxxxxxxx> wrote:

> On Fri, May 18, 2018 at 10:13:54AM +0200, Ingo Molnar wrote:
>> Yes, that's my main worry too about all these inlining changes:
>> the very, very marked reduction in the readability of assembly code.
> 
> Same reaction here: the small improvements this brings is simply not
> enough to sacrifice readability so much IMO.

I didnât try too hard to find more affected (micro)benchmarks, but I am
pretty sure there are: pretty much all the paravirt ops are currently not
inlined, which can affect kernel operations that bang on the page-tables.

Notice that this is not an x86-specific issue. Other architectures, with
not-as-good OOOE for instance, might incur higher overheads. So I donât
think that this issue should be ignored.