linux-kernel - Re: [PATCH v8 2/3] proc: add AVX-512 usage elapsed time to /proc/pid/status

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Date:   Mon, 11 Feb 2019 14:26:27 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Aubrey Li <aubrey.li@...el.com>
cc:     mingo@...hat.com, peterz@...radead.org, hpa@...or.com,
        ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        dave.hansen@...el.com, arjan@...ux.intel.com,
        linux-kernel@...r.kernel.org, Aubrey Li <aubrey.li@...ux.intel.com>
Subject: Re: [PATCH v8 2/3] proc: add AVX-512 usage elapsed time to
 /proc/pid/status

On Fri, 18 Jan 2019, Aubrey Li wrote:

> Subject: proc: add AVX-512 usage elapsed time to /proc/pid/status

Well, no. This should be split into two patches:

 #1 proc/status: Add support for architecture specific output

 #2 x86/proc/status: Add AVX-512 usage time
 
> +/*
> + * Report the amount of time elapsed in millisecond since last AVX512
> + * use in the task.
> + */
> +void avx512_state(struct seq_file *m, struct task_struct *task)
> +{
> +	unsigned long timestamp = task->thread.fpu.avx512_timestamp;
> +	long delta;
> +
> +	if (!timestamp)
> +		delta = -1;
> +	else {

Still lacks curly brackets around the if () clause

> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 0ceb3b6b37e7..dd88c2219f08 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -392,6 +392,10 @@ static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
>  	seq_putc(m, '\n');
>  }

> +void __weak arch_task_state(struct seq_file *m, struct task_struct *task)

Still lacks a function prototype in the appropriate header file and please
rename it to something which makes it clear what this is
about. arch_proc_pid_status() or something like that.

Thanks,

	tglx