RFC: Check IFUNC_XXX to enable/disable ifunc feature
Carlos O'Donell
carlos@redhat.com
Sun Jun 26 18:57:00 GMT 2016
On 06/26/2016 02:55 PM, Carlos O'Donell wrote:
> On 06/26/2016 10:50 AM, H.J. Lu wrote:
>> Hi,
>>
>> I'd like to check IFUNC_XXX environmental variable to enable/disable
>> the ifunc feature, XXX. That is
>>
>> 1. IFUNC_XXX=1 to enable XXX.
>> 2. IFUNC_XXX=0 to disable XXX.
>>
>> Any comments?
>
> How would it work? Does it just mean that the IFUNC selector bypasses
> the disabled choices?
>
> Also it does not meet Tunables consensus:
> "Tunable namespace should be clearly defined"
> https://sourceware.org/glibc/wiki/TuningLibraryRuntimeBehavior?highlight=%28Tunables%29
>
> Should perhaps be "GLIBC_<VER>_IFUNC_<ARCH>_<PUBLIC_IFUNC_NAME>"?
Or as suggested a single env-var GLIBC_TUNABLES="glbibc_2.24_x86-64_sse3=0;..."
processed by some scripts to enable disable tunables.
--
Cheers,
Carlos.
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