Re: [PATCH] manual: Add stability warning regarding system-wide tunables

"Andreas K. Huettel" <[email protected]> Tue, 21 Jul 2026 12:22:20 +0900

Newsgroups	gmane.comp.lib.glibc.alpha
Organization	Gentoo Linux
Message-ID	<[email protected]>

Am Montag, 20. Juli 2026, 23:20:32 Japanische Normalzeit schrieb Andreas K. Huettel:
> Am Montag, 20. Juli 2026, 22:53:56 Japanische Normalzeit schrieb Florian Weimer:
> > And mention system-wide tunables in NEWS.
> > 
> 
> Works for me. Please push it and I'll rebase and resend the remaining changes.
> Thanks! -a

Did it myself so I could send out the remaining changes. Thanks -A

> 
> Reviewed-by: Andreas K. Hüttel <[email protected]>
> 
> > ---
> >  NEWS                 | 5 +++++
> >  manual/tunables.texi | 8 +++++++-
> >  2 files changed, 12 insertions(+), 1 deletion(-)
> > 
> > diff --git a/NEWS b/NEWS
> > index e30b7a5f76..c161a3f5b0 100644
> > --- a/NEWS
> > +++ b/NEWS
> > @@ -9,6 +9,11 @@ Version 2.44
> >  
> >  Major new features:
> >  
> > +* System-wide tunables can be applied using /etc/tunables.conf and
> > +  running ldconfig.  Specific tunable settings and the
> > +  /etc/tunables.conf file format and path are not part of the stable
> > +  library interfaces and may change between releases.
> > +
> >  * A new tunable, glibc.elf.thp, is added to map read-only segments with
> >    Transparent Huge Pages (THP) if THP isn't disable in kernel.  When
> >    glibc.elf.thp is set to 1, malloc uses the actual kernel THP mode
> > diff --git a/manual/tunables.texi b/manual/tunables.texi
> > index e7dcef1040..b53cfbf4be 100644
> > --- a/manual/tunables.texi
> > +++ b/manual/tunables.texi
> > @@ -92,7 +92,13 @@ In addition to setting the @code{GLIBC_TUNABLES} environment variable,
> >  tunables may be provided globally via the file
> >  @file{/etc/tunables.conf}, which gets stored in glibc's dynamic
> >  library cache @file{/etc/ld.so.cache} and read by every program at
> > -startup.  @file{/etc/tunables.conf} contains one tunable per line:
> > +startup.
> > +
> > +@strong{Portability Note:} Specific tunable settings and the
> > +@file{/etc/tunables.conf} file format and path are not part of the
> > +stable library interfaces and may change between releases.
> > +
> > +The file @file{/etc/tunables.conf} contains one tunable per line:
> >  
> >  @example
> >  glibc.malloc.trim_threshold=128
> > 
> > base-commit: 249639137ed360d1827d9e663261ba26d2b01d81
> > 
> > 
> 
> 
> 


-- 
PD Dr. Andreas K. Hüttel
[email protected]
Gentoo Linux developer 
(council, comrel, toolchain, base-system, perl, libreoffice)
https://wiki.gentoo.org/wiki/User:Dilfridge

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