linux-kernel - Re: [PATCH v2] vmscan: add trace events for lru

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Date:   Sat, 23 Sep 2023 08:26:01 -0700
From:   "T.J. Mercier" <tjmercier@...gle.com>
To:     jaewon31.kim@...sung.com
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        "yuzhao@...gle.com" <yuzhao@...gle.com>,
        "kaleshsingh@...gle.com" <kaleshsingh@...gle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-trace-kernel@...r.kernel.org" 
        <linux-trace-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "jaewon31.kim@...il.com" <jaewon31.kim@...il.com>
Subject: Re: [PATCH v2] vmscan: add trace events for lru_gen

On Thu, Sep 21, 2023 at 7:27 PM 김재원 <jaewon31.kim@...sung.com> wrote:
>
> >On Thu, 21 Sep 2023 09:12:30 -0700
> >"T.J. Mercier" <tjmercier@...gle.com> wrote:
> >
> >> > +       TP_fast_assign(
> >> > +               __entry->nid = nid;
> >> > +               __entry->nr_reclaimed = nr_reclaimed;
> >> > +               __entry->nr_dirty = stat->nr_dirty;
> >> > +               __entry->nr_writeback = stat->nr_writeback;
> >> > +               __entry->nr_congested = stat->nr_congested;
> >> > +               __entry->nr_immediate = stat->nr_immediate;
> >> > +               __entry->nr_activate0 = stat->nr_activate[0];
> >> > +               __entry->nr_activate1 = stat->nr_activate[1];
> >> > +               __entry->nr_ref_keep = stat->nr_ref_keep;
> >> > +               __entry->nr_unmap_fail = stat->nr_unmap_fail;
> >> > +               __entry->priority = priority;
> >> > +               __entry->reclaim_flags = trace_reclaim_flags(file);
> >> > +       ),
> >> > +
> >> > +       TP_printk("nid=%d nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate_anon=%d nr_activate_file=%d nr_ref_keep=%ld nr_unmap_fail=%ld priority=%d flags=%s",
> >>
> >> Many of these values are unsigned so I think many of these format
> >> specifiers should be %lu instead of %ld.
>
> Hello T.J.
> Thank you for your comment
> As you expected I got this from the legacy lru trace.
> I've changed as you recommended.
> Actually I changed isolate_mode, too. Please let me know if this is not actually needed.
>
Great, looks good to me.
Reviewed-by: T.J. Mercier <tjmercier@...gle.com>

> --- a/include/trace/events/vmscan.h
> +++ b/include/trace/events/vmscan.h
> @@ -367,7 +367,7 @@ TRACE_EVENT_CONDITION(mm_vmscan_lru_gen_scan,
>          * classzone is previous name of the highest_zoneidx.
>          * Reason not to change it is the ABI requirement of the tracepoint.
>          */
> -       TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s",
> +       TP_printk("isolate_mode=%u classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu lru=%s",
>                 __entry->isolate_mode,
>                 __entry->highest_zoneidx,
>                 __entry->order,
> @@ -525,7 +525,7 @@ TRACE_EVENT(mm_vmscan_lru_gen_evict,
>                 __entry->reclaim_flags = trace_reclaim_flags(file);
>         ),
>
> -       TP_printk("nid=%d nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate_anon=%d nr_activate_file=%d nr_ref_keep=%ld nr_unmap_fail=%ld priority=%d flags=%s",
> +       TP_printk("nid=%d nr_reclaimed=%lu nr_dirty=%lu nr_writeback=%lu nr_congested=%lu nr_immediate=%lu nr_activate_anon=%u nr_activate_file=%u nr_ref_keep=%lu nr_unmap_fail=%lu priority=%d flags=%s",
>                 __entry->nid, __entry->nr_reclaimed,
>                 __entry->nr_dirty, __entry->nr_writeback,
>                 __entry->nr_congested, __entry->nr_immediate,
>
> >
> >Other than this, from the tracing POV:
> >
> >Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
>
>
> Hello Steven
> I've appreciated your Reviewed-by, let me take this on my next v3 patch.
>
> >
> >-- Steve