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From: Richard Henderson <richard.henderson@linaro.org>
To: Daniel Henrique Barboza <danielhb413@gmail.com>, qemu-devel@nongnu.org
Cc: clg@kaod.org, david@gibson.dropbear.id.au, qemu-ppc@nongnu.org,
	gustavo.romero@linaro.org, groug@kaod.org
Subject: Re: [PATCH 08/19] target/ppc/pmu_book3s_helper.c: do an actual cycles calculation
Date: Tue, 10 Aug 2021 14:34:57 -1000	[thread overview]
Message-ID: <d6f2a3d0-371f-f603-38b3-ef2c8203dba7@linaro.org> (raw)
In-Reply-To: <20210809131057.1694145-9-danielhb413@gmail.com>

On 8/9/21 3:10 AM, Daniel Henrique Barboza wrote:
> +/*
> + * Set arbitrarily based on clock-frequency values used in PNV
> + * and SPAPR code.
> + */
> +#define PPC_CPU_FREQ 1000000000
>   
>   static uint64_t get_cycles(uint64_t icount_delta)
>   {
> -    /* Placeholder value */
> -    return icount_delta * 4;
> +    return muldiv64(icount_to_ns(icount_delta), PPC_CPU_FREQ,
> +                    NANOSECONDS_PER_SECOND);

So, unless you're going to do something real, you might as well just return icount_to_ns, 
and skip all of the no-op scaling.


r~


  reply	other threads:[~2021-08-11  0:35 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09 13:10 [PATCH 00/19] PMU-EBB support for PPC64 TCG Daniel Henrique Barboza
2021-08-09 13:10 ` [PATCH 01/19] target/ppc: add exclusive Book3S PMU reg read/write functions Daniel Henrique Barboza
2021-08-10  3:19   ` David Gibson
2021-08-10 13:06     ` Daniel Henrique Barboza
2021-08-09 13:10 ` [PATCH 02/19] target/ppc: add exclusive user read function for PMU regs Daniel Henrique Barboza
2021-08-10  3:21   ` David Gibson
2021-08-09 13:10 ` [PATCH 03/19] target/ppc: add exclusive user write " Daniel Henrique Barboza
2021-08-10  3:29   ` David Gibson
2021-08-11  0:05     ` Richard Henderson
2021-08-09 13:10 ` [PATCH 04/19] target/ppc: PMU Book3s basic insns count for pseries TCG Daniel Henrique Barboza
2021-08-10  3:39   ` David Gibson
2021-08-10 13:24     ` Daniel Henrique Barboza
2021-08-16 17:53     ` Daniel Henrique Barboza
2021-08-17  2:59       ` David Gibson
2021-08-17  9:30         ` Daniel Henrique Barboza
2021-08-18  5:48           ` David Gibson
2021-08-11  0:26   ` Richard Henderson
2021-08-09 13:10 ` [PATCH 05/19] target/ppc/pmu_book3s_helper.c: eliminate code repetition Daniel Henrique Barboza
2021-08-10  3:40   ` David Gibson
2021-08-09 13:10 ` [PATCH 06/19] target/ppc/pmu_book3s_helper: enable PMC1-PMC4 events Daniel Henrique Barboza
2021-08-10  3:42   ` David Gibson
2021-08-10 15:03     ` Daniel Henrique Barboza
2021-08-10 23:08       ` Daniel Henrique Barboza
2021-08-11 23:27         ` Daniel Henrique Barboza
2021-08-12  1:52         ` David Gibson
2021-08-11  3:32       ` David Gibson
2021-08-09 13:10 ` [PATCH 07/19] target/ppc/pmu_book3s_helper.c: icount fine tuning Daniel Henrique Barboza
2021-08-09 13:10 ` [PATCH 08/19] target/ppc/pmu_book3s_helper.c: do an actual cycles calculation Daniel Henrique Barboza
2021-08-11  0:34   ` Richard Henderson [this message]
2021-08-09 13:10 ` [PATCH 09/19] PPC64/TCG: Implement 'rfebb' instruction Daniel Henrique Barboza
2021-08-10  3:50   ` David Gibson
2021-08-10 19:32     ` Daniel Henrique Barboza
2021-08-11  0:42       ` Richard Henderson
2021-08-11  3:36       ` David Gibson
2021-08-11  0:41   ` Richard Henderson
2021-08-09 13:10 ` [PATCH 10/19] target/ppc: PMU Event-Based exception support Daniel Henrique Barboza
2021-08-10  3:55   ` David Gibson
2021-08-11  0:50   ` Richard Henderson
2021-08-09 13:10 ` [PATCH 11/19] target/ppc/excp_helper.c: POWERPC_EXCP_EBB adjustments Daniel Henrique Barboza
2021-08-09 13:10 ` [PATCH 12/19] target/ppc/pmu_book3s_helper.c: enable PMC1 counter negative EBB Daniel Henrique Barboza
2021-08-10  4:01   ` David Gibson
2021-08-10 20:26     ` Daniel Henrique Barboza
2021-08-11  3:40       ` David Gibson
2021-08-11 11:18         ` Daniel Henrique Barboza
2021-08-12  3:39           ` David Gibson
2021-08-12  4:45             ` Richard Henderson
2021-08-12  4:56               ` Richard Henderson
2021-08-12 10:17                 ` Daniel Henrique Barboza
2021-08-12 21:24                   ` Daniel Henrique Barboza
2021-08-13  0:35                     ` Richard Henderson
2021-08-14 19:13                       ` Daniel Henrique Barboza
2021-08-15 19:24                         ` Richard Henderson
2021-08-09 13:10 ` [PATCH 13/19] target/ppc/translate: PMU: handle setting of PMCs while running Daniel Henrique Barboza
2021-08-10  4:06   ` David Gibson
2021-08-10 20:44     ` Daniel Henrique Barboza
2021-08-11  3:46       ` David Gibson
2021-08-09 13:10 ` [PATCH 14/19] target/ppc/pmu_book3s_helper.c: add generic timeout helpers Daniel Henrique Barboza
2021-08-10  4:09   ` David Gibson
2021-08-09 13:10 ` [PATCH 15/19] target/ppc/pmu_book3s_helper: enable counter negative for all PMCs Daniel Henrique Barboza
2021-08-10  4:11   ` David Gibson
2021-08-10 21:02     ` Daniel Henrique Barboza
2021-08-12  1:44       ` David Gibson
2021-08-09 13:10 ` [PATCH 16/19] target/ppc/pmu_book3s_helper: adding 0xFA event Daniel Henrique Barboza
2021-08-10  4:13   ` David Gibson
2021-08-09 13:10 ` [PATCH 17/19] target/ppc/pmu_book3s_helper.c: add PMC14/PMC56 counter freeze bits Daniel Henrique Barboza
2021-08-09 13:10 ` [PATCH 18/19] target/ppc/pmu_book3s_helper.c: add PM_CMPLU_STALL mock events Daniel Henrique Barboza
2021-08-10  4:17   ` David Gibson
2021-08-10 19:48     ` Daniel Henrique Barboza
2021-08-11  3:37       ` David Gibson
2021-08-09 13:10 ` [PATCH 19/19] docs/specs: add PPC64 TCG PMU-EBB documentation Daniel Henrique Barboza

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