linux-kernel - Re: [PATCH 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE

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Message-ID: <alpine.DEB.2.20.1610211710440.16183@macbook-air>
Date:   Fri, 21 Oct 2016 17:16:22 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Wang Nan <wangnan0@...wei.com>
cc:     mtk.manpages@...il.com, pi3orama@....com,
        linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
        lizefan@...wei.com, vincent.weaver@...ne.edu
Subject: Re: [PATCH 1/2] perf_event_open.2: Document
 PERF_EVENT_IOC_PAUSE_OUTPUT

On Fri, 21 Oct 2016, Wang Nan wrote:


> -.SS Using prctl(2)
> +.SS Using prctl

why this change?

> +.BR PERF_EVENT_IOC_PAUSE_OUTPUT " (since Linux 4.7)"
> +.\" commit 86e7972f690c1017fd086cdfe53d8524e68c661c
> +This allows pausing and resuming the event's ring-buffer. A
> +paused ring-buffer does not prevent samples generation, but simply
> +discards them. The discarded samples are considered lost, causes
> +.BR PERF_RECORD_LOST
> +to be generated when possible.

I don't know if it's worth mentioning that the reason to add this is to 
allow reading the ring-buffer without having to worry about data being
overwritten.

There are a few odd wording choices (mostly plural nouns) but otherwise 
looks fine to me.

Reviewed-by: Vince Weaver <vincent.weaver@...ne.edu>