* [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
@ 2021-01-29 16:32 Florian Weimer
2021-01-29 16:39 ` Paul Zimmermann
2021-01-29 16:39 ` Adhemerval Zanella
0 siblings, 2 replies; 4+ messages in thread
From: Florian Weimer @ 2021-01-29 16:32 UTC (permalink / raw)
To: libc-alpha
---
NEWS | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/NEWS b/NEWS
index d121f7df87..6521a4f5b7 100644
--- a/NEWS
+++ b/NEWS
@@ -16,6 +16,19 @@ Major new features:
* The dynamic linker accepts the --argv0 argument and provides opportunity
to change argv[0] string.
+* The dynamic linker loads optimized implementations of shared objects
+ from subdirectories under the glibc-hwcaps directory on the library
+ search path if the system's capabilities meet the requirements for
+ that subdirectory. Initially supported subdirectories include
+ "power9" and "power10" for the powerpc64le-linux-gnu architecture,
+ "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
+ "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
+ subsdirectory names correspond to the vendor-independent x86-64
+ microarchitecture levels defined in the x86-64 psABI supplement.
+
+* The new --help option of the dynamic linker provides usage and
+ information and library search path diagnostics.
+
* The mallinfo2 function is added to report statistics as per mallinfo,
but with larger field widths to accurately report values that are
larger than fit in an integer.
@@ -63,6 +76,14 @@ Deprecated and removed features, and other changes affecting compatibility:
libraries that use this type in their interfaces. The new definition
improves consistency with compiler behavior in many scenarios.
+* A future version of glibc will stop loading shared objects from the
+ "tls" subdirectories on the library search path, the subdirectory that
+ corresponds to the AT_PLATFORM system name, and also stop employing
+ the legacy AT_HWCAP search mechanism. Applications should switch to
+ the new glibc-hwcaps mechanism instead; if they do not do that, only
+ the baseline version (directly from the search path directory) will be
+ loaded.
+
Changes to build and runtime requirements:
* On Linux, the system administrator needs to configure /dev/pts with
--
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
2021-01-29 16:32 [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps Florian Weimer
@ 2021-01-29 16:39 ` Paul Zimmermann
2021-01-29 16:39 ` Adhemerval Zanella
1 sibling, 0 replies; 4+ messages in thread
From: Paul Zimmermann @ 2021-01-29 16:39 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
Dear Florian,
> +* The dynamic linker loads optimized implementations of shared objects
> + from subdirectories under the glibc-hwcaps directory on the library
> + search path if the system's capabilities meet the requirements for
> + that subdirectory. Initially supported subdirectories include
> + "power9" and "power10" for the powerpc64le-linux-gnu architecture,
> + "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
> + "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
> + subsdirectory names correspond to the vendor-independent x86-64
subsdirectory -> subdirectory
Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
2021-01-29 16:32 [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps Florian Weimer
2021-01-29 16:39 ` Paul Zimmermann
@ 2021-01-29 16:39 ` Adhemerval Zanella
2021-01-29 16:44 ` Florian Weimer
1 sibling, 1 reply; 4+ messages in thread
From: Adhemerval Zanella @ 2021-01-29 16:39 UTC (permalink / raw)
To: Florian Weimer, libc-alpha
Ok for 2.33.
On 29/01/2021 13:32, Florian Weimer wrote:
> ---
> NEWS | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/NEWS b/NEWS
> index d121f7df87..6521a4f5b7 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -16,6 +16,19 @@ Major new features:
> * The dynamic linker accepts the --argv0 argument and provides opportunity
> to change argv[0] string.
>
> +* The dynamic linker loads optimized implementations of shared objects
> + from subdirectories under the glibc-hwcaps directory on the library
> + search path if the system's capabilities meet the requirements for
> + that subdirectory. Initially supported subdirectories include
> + "power9" and "power10" for the powerpc64le-linux-gnu architecture,
> + "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
> + "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
> + subsdirectory names correspond to the vendor-independent x86-64
> + microarchitecture levels defined in the x86-64 psABI supplement.
> +
> +* The new --help option of the dynamic linker provides usage and
> + information and library search path diagnostics.
> +
> * The mallinfo2 function is added to report statistics as per mallinfo,
> but with larger field widths to accurately report values that are
> larger than fit in an integer.
Ok.
> @@ -63,6 +76,14 @@ Deprecated and removed features, and other changes affecting compatibility:
> libraries that use this type in their interfaces. The new definition
> improves consistency with compiler behavior in many scenarios.
>
> +* A future version of glibc will stop loading shared objects from the
> + "tls" subdirectories on the library search path, the subdirectory that
> + corresponds to the AT_PLATFORM system name, and also stop employing
> + the legacy AT_HWCAP search mechanism. Applications should switch to
> + the new glibc-hwcaps mechanism instead; if they do not do that, only
> + the baseline version (directly from the search path directory) will be
> + loaded.
> +
> Changes to build and runtime requirements:
>
> * On Linux, the system administrator needs to configure /dev/pts with
>
Ok.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps
2021-01-29 16:39 ` Adhemerval Zanella
@ 2021-01-29 16:44 ` Florian Weimer
0 siblings, 0 replies; 4+ messages in thread
From: Florian Weimer @ 2021-01-29 16:44 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
* Adhemerval Zanella:
> Ok for 2.33.
Thanks, pushed with Paul's typo fix.
Florian
--
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-01-29 16:32 [PATCH] NEWS: Add entry for glibc-hwcaps and deprecate legacy hwcaps Florian Weimer
2021-01-29 16:39 ` Paul Zimmermann
2021-01-29 16:39 ` Adhemerval Zanella
2021-01-29 16:44 ` Florian Weimer
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