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Date:   Thu, 23 Nov 2017 22:00:04 +0900
From:   Tetsuo Handa <>
To:, Michal Hocko <>,,
Cc:     Steven Rostedt <>,
        Ingo Molnar <>,
        Alex Deucher <>,
        "David S . Miller" <>,
        Harry Wentland <>,
        Greg Kroah-Hartman <>,
        Tony Cheng <>,
        Andrew Morton <>,
        Vlastimil Babka <>,
        Mel Gorman <>,
        Johannes Weiner <>,
        Pavel Tatashin <>
Subject: Re: [PATCH] Add slowpath enter/exit trace events

On 2017/11/23 19:43, wrote:
> The warning of slow allocation has been removed, this is
> a other way to fetch that information. But you need
> to enable the trace. The exit function also returns
> information about the number of retries, how long
> it was stalled and failure reason if that happened.

However, the fast path (I mean, get_page_from_freelist() at
"/* First allocation attempt */" label) might be slow, for it is
allowed to call node_reclaim() which can take uncontrollable
duration. I think that you need to add hooks like does. ;-)

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