linux-kernel - Re: [PATCH] perf/core: fast breakpoint modification via _IOC_MODIFY

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Message-ID: <20171108141522.GA6320@krava>
Date:   Wed, 8 Nov 2017 15:15:22 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Milind Chabbi <chabbi.milind@...il.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        linux-man@...r.kernel.org, mpe@...erman.id.au, ak@...ux.intel.com,
        kan.liang@...el.com, hbathini@...ux.vnet.ibm.com,
        sukadev@...ux.vnet.ibm.com, yao.jin@...ux.intel.com
Subject: Re: [PATCH] perf/core: fast breakpoint modification via
 _IOC_MODIFY_BREAKPOINT

On Mon, Nov 06, 2017 at 07:04:40AM -0800, Milind Chabbi wrote:
> Hi Jirka,
> 
> I see the tabs in my sent email, do you have suggestions on how best to
> send this patch so that the tabs are preserved by the email client?
> Can anybody else also check if they received with/without tabs?
> 
> release_bp_slot/reserve_bp_slot majic is not necessary since
> _IOC_MODIFY_BREAKPOINT ioctl modifies an already registered breakpoint
> without affecting the count of breakpoints active.

but AFAICS you allow to change the breakpoint type (bp_type)
and slot counts are based on the breakpoint type

jirka