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From: Florian Weimer <fweimer@redhat.com>
To: Wilco Dijkstra via Libc-alpha <libc-alpha@sourceware.org>
Cc: Wilco Dijkstra <Wilco.Dijkstra@arm.com>,
	 Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Subject: Re: [PATCH] AArch64: Add hp-timing.h
Date: Mon, 28 Jun 2021 12:20:48 +0200	[thread overview]
Message-ID: <87pmw6uw73.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <VE1PR08MB5599E9E405FE180BD3ACE2F283039@VE1PR08MB5599.eurprd08.prod.outlook.com> (Wilco Dijkstra via Libc-alpha's message of "Mon, 28 Jun 2021 10:11:28 +0000")

* Wilco Dijkstra via Libc-alpha:

> Add hp-timing.h using the cntcvt_el0 counter. Return timing in nanoseconds
> so it is fully compatible with generic hp-timing. Don't set HP_TIMING_INLINE
> in the dynamic linker since very old kernels may not handle cntcvt correctly.

Is the MSR called cntcvt_el0 or cntvct_el0?

I'm clearly missing something: If this is broken on some kernels, how is
this disabled?

Thanks,
Florian


  reply	other threads:[~2021-06-28 10:20 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 [this message]
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

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