From: Ingo Molnar <mingo@kernel.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: acme@kernel.org, peterz@infradead.org, jolsa@kernel.org,
linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 02/10] x86, perf: Support sysfs files depending on SMT status
Date: Thu, 12 May 2016 10:05:16 +0200 [thread overview]
Message-ID: <20160512080516.GA20497@gmail.com> (raw)
In-Reply-To: <1462489447-31832-3-git-send-email-andi@firstfloor.org>
* Andi Kleen <andi@firstfloor.org> wrote:
> +ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr,
> + char *page)
> +{
> + struct perf_pmu_events_ht_attr *pmu_attr =
> + container_of(attr, struct perf_pmu_events_ht_attr, attr);
> +
> + /*
> + * Report conditional events depending on Hyper-Threading.
> + *
> + * This is overly conservative as usually the HT special
> + * handling is not needed if the other CPU thread is idle.
> + *
> + * Note this does not (cannot) handle the case when thread
> + * siblings are invisible, for example with virtualization
> + * if they are owned by some other guest. The user tool
> + * has to re-read when a thread sibling gets onlined later.
> + */
> +
> + return sprintf(page, "%s",
> + topology_max_smt_threads() > 1 ?
> + pmu_attr->event_str_ht :
> + pmu_attr->event_str_noht);
> +}
> +
> EVENT_ATTR(cpu-cycles, CPU_CYCLES );
> EVENT_ATTR(instructions, INSTRUCTIONS );
> EVENT_ATTR(cache-references, CACHE_REFERENCES );
> diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
> index 8bd764df815d..ad2e870f77d9 100644
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -668,6 +668,14 @@ static struct perf_pmu_events_attr event_attr_##v = { \
> .event_str = str, \
> };
>
> +#define EVENT_ATTR_STR_HT(_name, v, noht, ht) \
> +static struct perf_pmu_events_ht_attr event_attr_##v = { \
> + .attr = __ATTR(_name, 0444, events_ht_sysfs_show, NULL),\
> + .id = 0, \
> + .event_str_noht = noht, \
> + .event_str_ht = ht, \
> +}
> +
> extern struct x86_pmu x86_pmu __read_mostly;
>
> static inline bool x86_pmu_has_lbr_callstack(void)
> @@ -938,6 +946,12 @@ int p6_pmu_init(void);
>
> int knc_pmu_init(void);
>
> +ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
> + char *page);
> +
> +ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr,
> + char *page);
> +
> static inline int is_ht_workaround_enabled(void)
> {
> return !!(x86_pmu.flags & PMU_FL_EXCL_ENABLED);
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 9e1c3ada91c4..b425f2d24b26 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -1304,6 +1304,13 @@ struct perf_pmu_events_attr {
> const char *event_str;
> };
>
> +struct perf_pmu_events_ht_attr {
> + struct device_attribute attr;
> + u64 id;
> + const char *event_str_ht;
> + const char *event_str_noht;
> +};
> +
> ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
> char *page);
>
NAK for the following stylistic reasons:
- structure definition does not follow existing style.
- silly line breaks inserted into random positions that make the code ugly.
Thanks,
Ingo
next prev parent reply other threads:[~2016-05-12 8:05 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-05 23:03 Add top down metrics to perf stat Andi Kleen
2016-05-05 23:03 ` [PATCH 01/10] x86: Add topology_max_smt_threads() Andi Kleen
2016-05-06 10:13 ` Peter Zijlstra
2016-05-06 10:47 ` Thomas Gleixner
2016-05-06 17:24 ` [UPDATED PATCH " Andi Kleen
2016-05-07 8:11 ` Thomas Gleixner
2016-05-12 8:07 ` Ingo Molnar
2016-05-05 23:03 ` [PATCH 02/10] x86, perf: Support sysfs files depending on SMT status Andi Kleen
2016-05-09 9:42 ` Peter Zijlstra
2016-05-09 14:27 ` Andi Kleen
2016-05-09 14:34 ` Peter Zijlstra
2016-05-12 8:05 ` Ingo Molnar [this message]
2016-05-05 23:04 ` [PATCH 03/10] x86, perf: Add Top Down events to Intel Core Andi Kleen
2016-05-11 13:23 ` Jiri Olsa
2016-05-11 13:29 ` Peter Zijlstra
2016-05-12 8:10 ` Ingo Molnar
2016-05-05 23:04 ` [PATCH 04/10] x86, perf: Add Top Down events to Intel Atom Andi Kleen
2016-05-05 23:04 ` [PATCH 05/10] x86, perf: Use new topology_max_smt_threads() in HT leak workaround Andi Kleen
2016-05-05 23:04 ` [PATCH 06/10] perf, tools, stat: Avoid fractional digits for integer scales Andi Kleen
2016-05-07 19:10 ` Jiri Olsa
2016-05-07 19:24 ` Andi Kleen
2016-05-11 13:00 ` Jiri Olsa
2016-05-11 16:43 ` Arnaldo Carvalho de Melo
2016-05-20 6:42 ` [tip:perf/urgent] perf " tip-bot for Andi Kleen
2016-05-05 23:04 ` [PATCH 07/10] perf, tools, stat: Scale values by unit before metrics Andi Kleen
2016-05-07 19:14 ` Jiri Olsa
2016-05-10 20:30 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2016-05-05 23:04 ` [PATCH 08/10] perf, tools, stat: Basic support for TopDown in perf stat Andi Kleen
2016-05-05 23:04 ` [PATCH 09/10] perf, tools, stat: Add computation of TopDown formulas Andi Kleen
2016-05-05 23:04 ` [PATCH 10/10] perf, tools, stat: Add extra output of counter values with -vv Andi Kleen
2016-05-12 8:03 ` Jiri Olsa
2016-05-20 0:05 ` Andi Kleen
2016-05-12 7:47 ` Add top down metrics to perf stat Jiri Olsa
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