From: Nilay Vaish <nilayvaish@gmail.com>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
"H. Peter Anvin" <h.peter.anvin@intel.com>,
Tony Luck <tony.luck@intel.com>, Tejun Heo <tj@kernel.org>,
Borislav Petkov <bp@suse.de>,
Stephane Eranian <eranian@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
David Carrillo-Cisneros <davidcc@google.com>,
Ravi V Shankar <ravi.v.shankar@intel.com>,
Vikas Shivappa <vikas.shivappa@linux.intel.com>,
Sai Prakhya <sai.praneeth.prakhya@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH 05/32] x86/intel_rdt: Implement scheduling support for Intel RDT
Date: Mon, 25 Jul 2016 11:25:10 -0500 [thread overview]
Message-ID: <CACbG308UW7yd3PSBKHz5h2DyVMGn3ciRg+7_HQ3RkytuHHbaLw@mail.gmail.com> (raw)
In-Reply-To: <1468371785-53231-6-git-send-email-fenghua.yu@intel.com>
On 12 July 2016 at 20:02, Fenghua Yu <fenghua.yu@intel.com> wrote:
> diff --git a/arch/x86/include/asm/intel_rdt.h b/arch/x86/include/asm/intel_rdt.h
> index 4f45dc8..afb6da3 100644
> --- a/arch/x86/include/asm/intel_rdt.h
> +++ b/arch/x86/include/asm/intel_rdt.h
> @@ -3,14 +3,42 @@
>
> #ifdef CONFIG_INTEL_RDT
>
> +#include <linux/jump_label.h>
> +
> #define MAX_CBM_LENGTH 32
> #define IA32_L3_CBM_BASE 0xc90
> #define CBM_FROM_INDEX(x) (IA32_L3_CBM_BASE + x)
>
> +extern struct static_key rdt_enable_key;
> +void __intel_rdt_sched_in(void *dummy);
> +
> struct clos_cbm_table {
> unsigned long l3_cbm;
> unsigned int clos_refcnt;
> };
>
> +/*
> + * intel_rdt_sched_in() - Writes the task's CLOSid to IA32_PQR_MSR
> + *
> + * Following considerations are made so that this has minimal impact
> + * on scheduler hot path:
> + * - This will stay as no-op unless we are running on an Intel SKU
> + * which supports L3 cache allocation.
> + * - Caches the per cpu CLOSid values and does the MSR write only
> + * when a task with a different CLOSid is scheduled in.
> + */
> +static inline void intel_rdt_sched_in(void)
> +{
> + /*
> + * Call the schedule in code only when RDT is enabled.
> + */
> + if (static_key_false(&rdt_enable_key))
> + __intel_rdt_sched_in(NULL);
static_key_false() is deprecated. I think this should be
static_branch_unlikely().
> diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
> index 6ad5b48..8379df8 100644
> --- a/arch/x86/kernel/cpu/intel_rdt.c
> +++ b/arch/x86/kernel/cpu/intel_rdt.c
> @@ -44,12 +46,33 @@ static cpumask_t rdt_cpumask;
> */
> static cpumask_t tmp_cpumask;
> static DEFINE_MUTEX(rdt_group_mutex);
> +struct static_key __read_mostly rdt_enable_key = STATIC_KEY_INIT_FALSE;
>
Similarly, this should be DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
Thanks
Nilay
next prev parent reply other threads:[~2016-07-25 16:25 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 1:02 [PATCH 00/32] Enable Intel Resource Allocation in Resource Director Technology Fenghua Yu
2016-07-13 1:02 ` [PATCH 01/32] x86/intel_rdt: Cache Allocation documentation Fenghua Yu
2016-07-13 1:02 ` [PATCH 02/32] x86/intel_rdt: Add support for Cache Allocation detection Fenghua Yu
2016-07-26 19:00 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 03/32] x86/intel_rdt: Add Class of service management Fenghua Yu
2016-07-13 1:02 ` [PATCH 04/32] x86/intel_rdt: Add L3 cache capacity bitmask management Fenghua Yu
2016-07-22 7:12 ` Marcelo Tosatti
2016-07-22 21:43 ` Luck, Tony
2016-07-23 4:31 ` Marcelo Tosatti
2016-07-26 3:18 ` Luck, Tony
2016-07-26 17:10 ` Shivappa Vikas
2016-07-13 1:02 ` [PATCH 05/32] x86/intel_rdt: Implement scheduling support for Intel RDT Fenghua Yu
2016-07-25 16:25 ` Nilay Vaish [this message]
2016-07-25 16:31 ` Nilay Vaish
2016-07-25 18:05 ` Luck, Tony
2016-07-25 22:47 ` David Carrillo-Cisneros
2016-07-13 1:02 ` [PATCH 06/32] x86/intel_rdt: Hot cpu support for Cache Allocation Fenghua Yu
2016-07-13 9:19 ` Thomas Gleixner
2016-07-21 19:46 ` Shivappa Vikas
2016-07-14 0:40 ` David Carrillo-Cisneros
2016-07-14 22:58 ` Yu, Fenghua
2016-07-13 1:02 ` [PATCH 07/32] x86/intel_rdt: Intel haswell Cache Allocation enumeration Fenghua Yu
2016-07-13 1:02 ` [PATCH 08/32] Define CONFIG_INTEL_RDT Fenghua Yu
2016-07-13 10:25 ` Thomas Gleixner
2016-07-13 18:05 ` Yu, Fenghua
2016-07-13 21:09 ` Thomas Gleixner
2016-07-13 21:18 ` Yu, Fenghua
2016-07-13 1:02 ` [PATCH 09/32] x86/intel_rdt: Intel Code Data Prioritization detection Fenghua Yu
2016-07-13 1:02 ` [PATCH 10/32] x86/intel_rdt: Adds support to enable Code Data Prioritization Fenghua Yu
2016-07-26 19:23 ` Nilay Vaish
2016-07-26 20:32 ` Shivappa Vikas
2016-07-13 1:02 ` [PATCH 11/32] x86/intel_rdt: Class of service and capacity bitmask management for CDP Fenghua Yu
2016-07-13 1:02 ` [PATCH 12/32] x86/intel_rdt: Hot cpu update for code data prioritization Fenghua Yu
2016-07-13 1:02 ` [PATCH 13/32] Documentation, x86: Documentation for Intel resource allocation user interface Fenghua Yu
2016-07-13 12:47 ` Thomas Gleixner
2016-07-13 17:13 ` Luck, Tony
2016-07-14 6:53 ` Thomas Gleixner
2016-07-14 17:16 ` Luck, Tony
2016-07-19 12:32 ` Thomas Gleixner
2016-08-04 23:38 ` Yu, Fenghua
2016-07-27 16:20 ` Nilay Vaish
2016-07-27 16:57 ` Luck, Tony
2016-08-03 22:15 ` Marcelo Tosatti
2016-07-13 1:02 ` [PATCH 14/32] x86/cpufeatures: Get max closid and max cbm len and clean feature comments and code Fenghua Yu
2016-07-27 16:49 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 15/32] cacheinfo: Introduce cache id Fenghua Yu
2016-07-27 17:04 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 16/32] Documentation, ABI: Add a document entry for " Fenghua Yu
2016-07-13 1:02 ` [PATCH 17/32] x86, intel_cacheinfo: Enable cache id in x86 Fenghua Yu
2016-07-28 5:41 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 18/32] drivers/base/cacheinfo.c: Export some cacheinfo functions for others to use Fenghua Yu
2016-07-13 1:02 ` [PATCH 19/32] sched.h: Add rg_list and rdtgroup in task_struct Fenghua Yu
2016-07-13 12:56 ` Thomas Gleixner
2016-07-13 17:50 ` Yu, Fenghua
2016-07-28 5:53 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 20/32] magic number for rscctrl file system Fenghua Yu
2016-07-28 5:57 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 21/32] x86/intel_rdt.h: Header for inter_rdt.c Fenghua Yu
2016-07-28 14:07 ` Nilay Vaish
2016-07-13 1:02 ` [PATCH 22/32] x86/intel_rdt_rdtgroup.h: Header for user interface Fenghua Yu
2016-07-13 1:02 ` [PATCH 23/32] x86/intel_rdt.c: Extend RDT to per cache and per resources Fenghua Yu
2016-07-13 13:07 ` Thomas Gleixner
2016-07-13 17:40 ` Yu, Fenghua
2016-07-13 1:02 ` [PATCH 24/32] Task fork and exit for rdtgroup Fenghua Yu
2016-07-13 13:14 ` Thomas Gleixner
2016-07-13 17:32 ` Yu, Fenghua
2016-07-13 21:02 ` Thomas Gleixner
2016-07-13 21:22 ` Yu, Fenghua
2016-07-13 1:02 ` [PATCH 25/32] x86/intel_rdt_rdtgroup.c: User interface for RDT Fenghua Yu
2016-07-14 12:30 ` Thomas Gleixner
2016-07-13 1:02 ` [PATCH 26/32] x86/intel_rdt_rdtgroup.c: Create info directory Fenghua Yu
2016-07-13 1:03 ` [PATCH 27/32] x86/intel_rdt_rdtgroup.c: Implement rscctrl file system commands Fenghua Yu
2016-07-13 1:03 ` [PATCH 28/32] x86/intel_rdt_rdtgroup.c: Read and write cpus Fenghua Yu
2016-07-13 1:03 ` [PATCH 29/32] x86/intel_rdt_rdtgroup.c: Tasks iterator and write Fenghua Yu
2016-07-13 1:03 ` [PATCH 30/32] x86/intel_rdt_rdtgroup.c: Process schemas input from rscctrl interface Fenghua Yu
2016-07-14 0:41 ` David Carrillo-Cisneros
2016-07-14 6:11 ` Thomas Gleixner
2016-07-14 6:16 ` Yu, Fenghua
2016-07-14 6:32 ` Yu, Fenghua
2016-07-13 1:03 ` [PATCH 31/32] MAINTAINERS: Add maintainer for Intel RDT resource allocation Fenghua Yu
2016-07-13 1:03 ` [PATCH 32/32] x86/Makefile: Build intel_rdt_rdtgroup.c Fenghua Yu
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