linux-kernel - Re: [PATCH] mm, vmscan, tracing: Use pointer to reclaim

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Message-Id: <20180322141022.f02476e1f76338ab9cecf62e@linux-foundation.org>
Date:   Thu, 22 Mar 2018 14:10:22 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>, Mel Gorman <mgorman@...e.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexei Starovoitov <ast@...com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: [PATCH] mm, vmscan, tracing: Use pointer to reclaim_stat struct
 in trace event

On Thu, 22 Mar 2018 12:10:03 -0400 Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> The trace event trace_mm_vmscan_lru_shrink_inactive() currently has 12
> parameters! Seven of them are from the reclaim_stat structure. This
> structure is currently local to mm/vmscan.c. By moving it to the global
> vmstat.h header, we can also reference it from the vmscan tracepoints. In
> moving it, it brings down the overhead of passing so many arguments to the
> trace event. In the future, we may limit the number of arguments that a
> trace event may pass (ideally just 6, but more realistically it may be 8).

Unfortunately this is not a good time.  Andrey's "mm/vmscan: replace
mm_vmscan_lru_shrink_inactive with shrink_page_list tracepoint" mucks
with this code quite a lot and that patch's series is undergoing review
at present, with a few issues yet unresolved.

I'll park your patch for now and if Andrey's series doesn't converge
soon I'll merge this and will ask Andrey to redo things.