Re: [PATCH v2 0/3] System-wide tunables

[Szabolcs Nagy <szabolcs.nagy@arm.com>]

The 04/18/2024 23:48, DJ Delorie wrote:
> This patch series is the initial implementation of system-wide
> tunables, which I mentioned a few months ago.
> 
> The first part has ldconfig read tunable information from
> /etc/tunables.conf and store it to /etc/ld.so.cache.  Reusing ldconfig
> means no new documentation or training would be required of sysadmins,
> or reprogramming of distro packaging.

a user may want multiple glibcs with different abi
on the same system (32bit, ilp32, lp64, l64p128, ..)
all sharing the same /etc/ld.so.cache (iirc this is
possible now)

tunables can differ across targets, so they need to
be checked not to cause trouble (e.g. doing a hwcap
mask specified by an int instead of arch feature can
do different things across abis)

and i'm not sure it's a good idea that one glibc cannot
be independently updated from others since tunables are
not abi stable, while iirc the /etc/ld.so.chace is
backward compat.