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From: Johannes Weiner <hannes@cmpxchg.org>
To: Peter Zijlstra <peterz@infradead.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: Thu, 10 May 2018 09:49:21 -0400	[thread overview]
Message-ID: <20180510134921.GC19348@cmpxchg.org> (raw)
In-Reply-To: <20180509095938.GJ12217@hirez.programming.kicks-ass.net>

On Wed, May 09, 2018 at 11:59:38AM +0200, Peter Zijlstra wrote:
> 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.

It's NONE that's excluded. I'll add a comment.

> > +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.

Good spot, I'll reshuffle this accordingly.

> > +	/* 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.

int it is.

Thanks

  reply	other threads:[~2018-05-10 13:47 UTC|newest]

Thread overview: 45+ 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
2018-05-10 13:49     ` Johannes Weiner [this message]
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
2018-05-10 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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