linux-kernel - [PATCH v3 0/2] mm: memcg: improve vmscan tracepoints

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Date:   Thu, 23 Nov 2023 22:39:35 +0300
From:   Dmitry Rokosov <ddrokosov@...utedevices.com>
To:     <rostedt@...dmis.org>, <mhiramat@...nel.org>, <hannes@...xchg.org>,
        <mhocko@...nel.org>, <roman.gushchin@...ux.dev>,
        <shakeelb@...gle.com>, <muchun.song@...ux.dev>, <mhocko@...e.com>,
        <akpm@...ux-foundation.org>
CC:     <kernel@...rdevices.ru>, <rockosov@...il.com>,
        <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        Dmitry Rokosov <ddrokosov@...utedevices.com>
Subject: [PATCH v3 0/2] mm: memcg: improve vmscan tracepoints

The motivation behind this commit is to enhance the traceability and
understanding of memcg events. By integrating the function cgroup_ino()
into the existing memcg tracepoints, this patch series introduces a new
tracepoint template for the begin() and end() events. It utilizes a new
entry field ino to store the cgroup ino, enabling developers to easily
identify the cgroup associated with a specific memcg tracepoint event.

Additionally, this patch series introduces new shrink_memcg tracepoints
to facilitate non-direct memcg reclaim tracing and debugging.

Changes v3 since v2 at [2]:
    - use cgroup_ino() instead of cgroup_name() for memcg tracepoints
      because cgroup_name() acquires a global rw_lock, which can
      potentially slow down the system
    - introduce a stub macro for each shrink_memcg tracepoint to avoid
      using ifdefs within the common vmscan code."

Changes v2 since v1 at [1]:
    - change the position of the "memcg" parameter to ensure backward
      compatibility with userspace tools that use memcg tracepoints
    - add additional CONFIG_MEMCG ifdefs to prevent the use of memcg
      tracepoints when memcg is disabled

Links:
    [1] https://lore.kernel.org/all/20231101102837.25205-1-ddrokosov@salutedevices.com/
    [2] https://lore.kernel.org/all/20231123071945.25811-1-ddrokosov@salutedevices.com/

Dmitry Rokosov (2):
  mm: memcg: print out cgroup ino in the memcg tracepoints
  mm: memcg: introduce new event to trace shrink_memcg

 include/trace/events/vmscan.h | 95 ++++++++++++++++++++++++++++++-----
 mm/vmscan.c                   | 17 +++++--
 2 files changed, 95 insertions(+), 17 deletions(-)

-- 
2.36.0