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Date:   Thu, 9 Apr 2020 15:33:35 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, akpm@...ux-foundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, rostedt@...dmis.org,
        Alexei Starovoitov <ast@...nel.org>,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Ingo Molnar <mingo@...hat.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC PATCH 3/9] writeback: tracing: pass global_wb_domain as
 tracepoint parameter

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.

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