public inbox for libc-alpha@sourceware.org
 help / color / mirror / Atom feed
From: Florian Weimer <fweimer@redhat.com>
To: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Cc: Szabolcs Nagy via Libc-alpha <libc-alpha@sourceware.org>,
	 Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
	 Siddhesh Poyarekar <siddhesh@redhat.com>
Subject: Re: [PATCH] AArch64: Add hp-timing.h
Date: Tue, 06 Jul 2021 13:33:57 +0200	[thread overview]
Message-ID: <87sg0rhe1m.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <VE1PR08MB5599C5458C811FA4CE866C8A83009@VE1PR08MB5599.eurprd08.prod.outlook.com> (Wilco Dijkstra's message of "Thu, 1 Jul 2021 10:21:45 +0000")

* Wilco Dijkstra:

> Hi Florian,
>
>> This commit would not be entirely accurate.  We install and ship the
>> benchtests, so they need to use a stable ISA (and kernel ABI).
>>
>> If the benchtests are like the testsuite and are not intended to be
>> installed and distributed, we probably need to make downstream changes.
>
> Is this something distro specific? I don't see it in the GLIBC install
> directory after "make install" or anywhere on my system.

Looks like it.

> In any case, there is no ABI change here - cntvct_el0 is always
> allowed in userspace.

Good to know.  It's just that the performance could be problematic,
right?

I'm still puzzled why we can't leave the decision to the vDSO.  Generic
hp-timing support should do that.

Thanks,
Florian


      parent reply	other threads:[~2021-07-06 11:34 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 10:11 Wilco Dijkstra
2021-06-28 10:20 ` Florian Weimer
2021-06-28 10:53   ` Wilco Dijkstra
2021-06-28 11:06     ` Florian Weimer
2021-06-28 11:35       ` Wilco Dijkstra
2021-06-28 11:39         ` Florian Weimer
2021-06-28 11:49       ` Szabolcs Nagy
2021-06-28 11:55         ` Adhemerval Zanella
2021-06-28 12:10         ` Wilco Dijkstra
2021-06-28 13:15           ` Adhemerval Zanella
2021-06-28 14:24           ` Wilco Dijkstra
2021-06-28 14:46             ` Adhemerval Zanella
2021-06-28 19:16               ` Wilco Dijkstra
2021-06-30  8:46 ` Szabolcs Nagy
2021-06-30  8:55   ` Florian Weimer
2021-06-30  9:33     ` Siddhesh Poyarekar
2021-07-01 10:21     ` Wilco Dijkstra
2021-07-01 13:48       ` Szabolcs Nagy
2021-07-01 15:33         ` Wilco Dijkstra
2021-07-06 11:33       ` Florian Weimer [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87sg0rhe1m.fsf@oldenburg.str.redhat.com \
    --to=fweimer@redhat.com \
    --cc=Szabolcs.Nagy@arm.com \
    --cc=Wilco.Dijkstra@arm.com \
    --cc=libc-alpha@sourceware.org \
    --cc=siddhesh@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).