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Re: [PATCH] Add Prefer_MAP_32BIT_EXEC for Silvermont
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Florian Weimer <fweimer at redhat dot com>
- Cc: Jeff Law <law at redhat dot com>, Zack Weinberg <zackw at panix dot com>, Andi Kleen <andi at firstfloor dot org>, Adhemerval Zanella <adhemerval dot zanella at linaro dot org>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 14 Dec 2015 09:38:10 -0800
- Subject: Re: [PATCH] Add Prefer_MAP_32BIT_EXEC for Silvermont
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On Mon, Dec 14, 2015 at 9:34 AM, Florian Weimer <fweimer@redhat.com> wrote:
> On 12/14/2015 06:10 PM, H.J. Lu wrote:
>> On Mon, Dec 14, 2015 at 7:15 AM, Florian Weimer <fweimer@redhat.com> wrote:
>>> On 12/12/2015 06:36 PM, H.J. Lu wrote:
>>>
>>>> Here is the updated patch to make it opt-in. OK for master?
>>>
>>> I would still like to see performance numbers for the PIE and vDSO
>>> cases, as requested here:
>>
>> This optimization has no performance impact on PIE nor
>> vDSO.
>
> That's unfortunate. Why don't you need a more complete fix?
>
PIE and vDSO are loaded by kernel, not ld.so, which is beyond
the scope of this patch. For our workloads, this patch is sufficient.
--
H.J.