From: Peter Zijlstra <peterz@infradead.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linuxfoundation.org>,
Tejun Heo <tj@kernel.org>, Balbir Singh <bsingharora@gmail.com>,
Mike Galbraith <efault@gmx.de>, Oliver Yang <yangoliver@me.com>,
Shakeel Butt <shakeelb@google.com>, xxx xxx <x.qendo@gmail.com>,
Taras Kondratiuk <takondra@cisco.com>,
Daniel Walker <danielwa@cisco.com>,
Vinayak Menon <vinmenon@codeaurora.org>,
Ruslan Ruslichenko <rruslich@cisco.com>,
kernel-team@fb.com
Subject: Re: [PATCH 6/7] psi: pressure stall information for CPU, memory, and IO
Date: Wed, 9 May 2018 11:59:38 +0200 [thread overview]
Message-ID: <20180509095938.GJ12217@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180507210135.1823-7-hannes@cmpxchg.org>
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
> new file mode 100644
> index 000000000000..b22b0ffc729d
> --- /dev/null
> +++ b/include/linux/psi_types.h
> @@ -0,0 +1,84 @@
> +#ifndef _LINUX_PSI_TYPES_H
> +#define _LINUX_PSI_TYPES_H
> +
> +#include <linux/types.h>
> +
> +#ifdef CONFIG_PSI
> +
> +/* Tracked task states */
> +enum psi_task_count {
> + NR_RUNNING,
> + NR_IOWAIT,
> + NR_MEMSTALL,
> + NR_PSI_TASK_COUNTS,
> +};
> +
> +/* Task state bitmasks */
> +#define TSK_RUNNING (1 << NR_RUNNING)
> +#define TSK_IOWAIT (1 << NR_IOWAIT)
> +#define TSK_MEMSTALL (1 << NR_MEMSTALL)
> +
> +/* Resources that workloads could be stalled on */
> +enum psi_res {
> + PSI_CPU,
> + PSI_MEM,
> + PSI_IO,
> + NR_PSI_RESOURCES,
> +};
> +
> +/* Pressure states for a group of tasks */
> +enum psi_state {
> + PSI_NONE, /* No stalled tasks */
> + PSI_SOME, /* Stalled tasks & working tasks */
> + PSI_FULL, /* Stalled tasks & no working tasks */
> + NR_PSI_STATES,
> +};
> +
> +struct psi_resource {
> + /* Current pressure state for this resource */
> + enum psi_state state;
> +
> + /* Start of current state (cpu_clock) */
> + u64 state_start;
> +
> + /* Time sampling buckets for pressure states (ns) */
> + u64 times[NR_PSI_STATES - 1];
Fails to explain why no FULL.
> +};
> +
> +struct psi_group_cpu {
> + /* States of the tasks belonging to this group */
> + unsigned int tasks[NR_PSI_TASK_COUNTS];
> +
AFAICT there's a hole here, that would fit the @nonidle member. Which
also avoids the later hole generated by it.
> + /* Per-resource pressure tracking in this group */
> + struct psi_resource res[NR_PSI_RESOURCES];
> +
> + /* There are runnable or D-state tasks */
> + bool nonidle;
Mandatory complaint about using _Bool in composites goes here.
> + /* Start of current non-idle state (cpu_clock) */
> + u64 nonidle_start;
> +
> + /* Time sampling bucket for non-idle state (ns) */
> + u64 nonidle_time;
> +};
> +
> +struct psi_group {
> + struct psi_group_cpu *cpus;
> +
> + struct delayed_work clock_work;
> + unsigned long period_expires;
> +
> + u64 some[NR_PSI_RESOURCES];
> + u64 full[NR_PSI_RESOURCES];
> +
> + unsigned long avg_some[NR_PSI_RESOURCES][3];
> + unsigned long avg_full[NR_PSI_RESOURCES][3];
> +};
next prev parent reply other threads:[~2018-05-09 9:59 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 21:01 [PATCH 0/7] psi: pressure stall information for CPU, memory, and IO Johannes Weiner
2018-05-07 21:01 ` [PATCH 1/7] mm: workingset: don't drop refault information prematurely Johannes Weiner
2018-05-07 21:01 ` [PATCH 2/7] mm: workingset: tell cache transitions from workingset thrashing Johannes Weiner
2018-05-07 21:01 ` [PATCH 3/7] delayacct: track delays from thrashing cache pages Johannes Weiner
2018-05-07 21:01 ` [PATCH 4/7] sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD Johannes Weiner
2018-05-07 21:01 ` [PATCH 5/7] sched: loadavg: make calc_load_n() public Johannes Weiner
2018-05-09 9:49 ` Peter Zijlstra
2018-05-10 13:46 ` Johannes Weiner
2018-05-07 21:01 ` [PATCH 6/7] psi: pressure stall information for CPU, memory, and IO Johannes Weiner
2018-05-08 0:42 ` Randy Dunlap
2018-05-08 14:06 ` Johannes Weiner
2018-05-08 1:35 ` kbuild test robot
2018-05-08 3:04 ` kbuild test robot
2018-05-08 14:05 ` Johannes Weiner
2018-05-09 9:59 ` Peter Zijlstra [this message]
2018-05-10 13:49 ` Johannes Weiner
2018-05-09 10:04 ` Peter Zijlstra
2018-05-10 14:10 ` Johannes Weiner
2018-05-09 10:05 ` Peter Zijlstra
2018-05-10 14:13 ` Johannes Weiner
2018-05-09 10:14 ` Peter Zijlstra
2018-05-10 14:18 ` Johannes Weiner
2018-05-09 10:21 ` Peter Zijlstra
2018-05-10 14:24 ` Johannes Weiner
2018-05-09 10:26 ` Peter Zijlstra
2018-05-09 10:46 ` Peter Zijlstra
2018-05-09 11:38 ` Peter Zijlstra
2018-05-10 13:41 ` Johannes Weiner
2018-05-14 8:33 ` Peter Zijlstra
2018-05-09 10:55 ` Peter Zijlstra
2018-05-09 11:03 ` Vinayak Menon
2018-05-23 13:17 ` Johannes Weiner
2018-05-23 13:19 ` Vinayak Menon
2018-06-07 0:46 ` Suren Baghdasaryan
2018-05-07 21:01 ` [PATCH 7/7] psi: cgroup support Johannes Weiner
2018-05-09 11:07 ` Peter Zijlstra
2018-05-10 14:49 ` Johannes Weiner
2018-05-14 15:39 ` [PATCH 0/7] psi: pressure stall information for CPU, memory, and IO Christopher Lameter
2018-05-14 17:35 ` Bart Van Assche
2018-05-14 18:55 ` Johannes Weiner
2018-05-14 20:15 ` Christopher Lameter
2018-05-26 0:29 ` Suren Baghdasaryan
2018-05-29 18:16 ` Johannes Weiner
2018-05-30 23:32 ` Suren Baghdasaryan
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