linux-kernel - Re: [RFC PATCH 3/9] writeback: tracing: pass global_wb

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Date:   Fri, 10 Apr 2020 07:54:09 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        K <prasad@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        rostedt <rostedt@...dmis.org>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ingo Molnar <mingo@...hat.com>, bpf <bpf@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH 3/9] writeback: tracing: pass global_wb_domain as
 tracepoint parameter

----- On Apr 9, 2020, at 6:33 PM, Alexei Starovoitov alexei.starovoitov@...il.com wrote:

> On Thu, Apr 09, 2020 at 03:35:37PM -0400, Mathieu Desnoyers wrote:
>>  		if (pause < min_pause) {
>> -			trace_balance_dirty_pages(wb,
>> +			trace_balance_dirty_pages(&global_wb_domain,
>> +						  wb,
>>  						  sdtc->thresh,
>>  						  sdtc->bg_thresh,
>>  						  sdtc->dirty,
> 
> argh. 13 arguments to single function ?!
> Currently the call site looks like:
>                        trace_balance_dirty_pages(wb,
>                                                  sdtc->thresh,
>                                                  sdtc->bg_thresh,
>                                                  sdtc->dirty,
>                                                  sdtc->wb_thresh,
>                                                  sdtc->wb_dirty,
>                                                  dirty_ratelimit,
>                                                  task_ratelimit,
>                                                  pages_dirtied,
>                                                  period,
>                                                  min(pause, 0L),
>                                                  start_time);
> Just pass sdtc as a pointer instead.
> Then another wb argument will be fine.

Good point! In order to do that I would need to move the declaration
of struct dirty_throttle_control from mm/page-writeback.c to
include/linux/writeback.h so it can be used from the tracepoint.

Seems fair ?

Thanks,

Mathieu


-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com