linux-kernel - Re: [PATCH] sparc: perf: fix updated event period in response to PERF_EVENT_IOC

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Message-Id: <20190602.221648.1225654208143233174.davem@davemloft.net>
Date:   Sun, 02 Jun 2019 22:16:48 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     92siuyang@...il.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc: perf: fix updated event period in response to
 PERF_EVENT_IOC_PERIOD

From: Young Xiao <92siuyang@...il.com>
Date: Wed, 29 May 2019 10:21:48 +0800

> The PERF_EVENT_IOC_PERIOD ioctl command can be used to change the
> sample period of a running perf_event. Consequently, when calculating
> the next event period, the new period will only be considered after the
> previous one has overflowed.
> 
> This patch changes the calculation of the remaining event ticks so that
> they are offset if the period has changed.
> 
> See commit 3581fe0ef37c ("ARM: 7556/1: perf: fix updated event period in
> response to PERF_EVENT_IOC_PERIOD") for details.
> 
> Signed-off-by: Young Xiao <92siuyang@...il.com>

Applied, thanks.