From: Peter Zijlstra <peterz@infradead.org>
To: Kajol Jain <kjain@linux.ibm.com>
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
maddy@linux.vnet.ibm.com, aneesh.kumar@linux.ibm.com,
vaibhav@linux.ibm.com, atrajeev@linux.vnet.ibm.com,
tglx@linutronix.de
Subject: Re: [RFC 1/4] drivers/nvdimm: Add perf interface to expose nvdimm performance stats
Date: Wed, 12 May 2021 19:27:16 +0200 [thread overview]
Message-ID: <YJwP9ByvAcDPixVN@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210512163824.255370-2-kjain@linux.ibm.com>
On Wed, May 12, 2021 at 10:08:21PM +0530, Kajol Jain wrote:
> +static void nvdimm_pmu_read(struct perf_event *event)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->read)
> + nd_pmu->read(event, nd_pmu->dev);
> +}
> +
> +static void nvdimm_pmu_del(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->del)
> + nd_pmu->del(event, flags, nd_pmu->dev);
> +}
> +
> +static int nvdimm_pmu_add(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + if (flags & PERF_EF_START)
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->add)
> + return nd_pmu->add(event, flags, nd_pmu->dev);
> + return 0;
> +}
What's the value add here? Why can't you directly set driver pointers? I
also don't really believe ->{add,del,read} can be optional and still
have a sane driver.
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WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Kajol Jain <kjain@linux.ibm.com>
Cc: santosh@fossix.org, maddy@linux.vnet.ibm.com,
ira.weiny@intel.com, linux-nvdimm@lists.01.org,
linux-kernel@vger.kernel.org, atrajeev@linux.vnet.ibm.com,
aneesh.kumar@linux.ibm.com, vaibhav@linux.ibm.com,
dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org,
tglx@linutronix.de
Subject: Re: [RFC 1/4] drivers/nvdimm: Add perf interface to expose nvdimm performance stats
Date: Wed, 12 May 2021 19:27:16 +0200 [thread overview]
Message-ID: <YJwP9ByvAcDPixVN@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210512163824.255370-2-kjain@linux.ibm.com>
On Wed, May 12, 2021 at 10:08:21PM +0530, Kajol Jain wrote:
> +static void nvdimm_pmu_read(struct perf_event *event)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->read)
> + nd_pmu->read(event, nd_pmu->dev);
> +}
> +
> +static void nvdimm_pmu_del(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->del)
> + nd_pmu->del(event, flags, nd_pmu->dev);
> +}
> +
> +static int nvdimm_pmu_add(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + if (flags & PERF_EF_START)
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->add)
> + return nd_pmu->add(event, flags, nd_pmu->dev);
> + return 0;
> +}
What's the value add here? Why can't you directly set driver pointers? I
also don't really believe ->{add,del,read} can be optional and still
have a sane driver.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Kajol Jain <kjain@linux.ibm.com>
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
maddy@linux.vnet.ibm.com, santosh@fossix.org,
aneesh.kumar@linux.ibm.com, vaibhav@linux.ibm.com,
dan.j.williams@intel.com, ira.weiny@intel.com,
atrajeev@linux.vnet.ibm.com, tglx@linutronix.de
Subject: Re: [RFC 1/4] drivers/nvdimm: Add perf interface to expose nvdimm performance stats
Date: Wed, 12 May 2021 19:27:16 +0200 [thread overview]
Message-ID: <YJwP9ByvAcDPixVN@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210512163824.255370-2-kjain@linux.ibm.com>
On Wed, May 12, 2021 at 10:08:21PM +0530, Kajol Jain wrote:
> +static void nvdimm_pmu_read(struct perf_event *event)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->read)
> + nd_pmu->read(event, nd_pmu->dev);
> +}
> +
> +static void nvdimm_pmu_del(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->del)
> + nd_pmu->del(event, flags, nd_pmu->dev);
> +}
> +
> +static int nvdimm_pmu_add(struct perf_event *event, int flags)
> +{
> + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu);
> +
> + if (flags & PERF_EF_START)
> + /* jump to arch/platform specific callbacks if any */
> + if (nd_pmu && nd_pmu->add)
> + return nd_pmu->add(event, flags, nd_pmu->dev);
> + return 0;
> +}
What's the value add here? Why can't you directly set driver pointers? I
also don't really believe ->{add,del,read} can be optional and still
have a sane driver.
next prev parent reply other threads:[~2021-05-12 17:27 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 16:38 [RFC 0/4] Add perf interface to expose nvdimm performance stats Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` [RFC 1/4] drivers/nvdimm: " Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 17:27 ` Peter Zijlstra [this message]
2021-05-12 17:27 ` Peter Zijlstra
2021-05-12 17:27 ` Peter Zijlstra
2021-05-13 12:26 ` kajoljain
2021-05-13 12:26 ` kajoljain
2021-05-13 12:26 ` kajoljain
2021-05-14 11:47 ` Peter Zijlstra
2021-05-14 11:47 ` Peter Zijlstra
2021-05-14 11:47 ` Peter Zijlstra
2021-05-17 6:43 ` kajoljain
2021-05-17 6:43 ` kajoljain
2021-05-17 6:43 ` kajoljain
2021-05-16 0:09 ` kernel test robot
2021-05-12 16:38 ` [RFC 2/4] powerpc/papr_scm: Add perf interface support Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` [RFC 3/4] powerpc/papr_scm: Document papr_scm sysfs event format entries Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` [RFC 4/4] powerpc/papr_scm: Add cpu hotplug support for nvdimm pmu device Kajol Jain
2021-05-12 16:38 ` Kajol Jain
2021-05-12 16:38 ` Kajol Jain
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