linux-kernel - [PATCH 0/5] Fix page_owner's use of free timestamps

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Date:   Fri, 13 Oct 2023 15:03:44 -0400
From:   Audra Mitchell <audra@...hat.com>
To:     linux-mm@...ck.org
Cc:     raquini@...hat.com, akpm@...ux-foundation.org, djakov@...nel.org,
        vbabka@...e.cz, linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] Fix page_owner's use of free timestamps 

While page ower output is used to investigate memory utilization, typically
the allocation pathway, the introduction of timestamps to the page owner 
records caused each record to become unique due to the granularity of the
nanosecond timestamp (for example):

  Page allocated via order 0 ... ts 5206196026 ns, free_ts 5187156703 ns
  Page allocated via order 0 ... ts 5206198540 ns, free_ts 5187162702 ns

Furthermore, the page_owner output only dumps the currently allocated 
records, so having the free timestamps is nonsensical for the typical use 
case.

In addition, the introduction of timestamps was not properly handled in
the page_owner_sort tool causing most use cases to be broken. This series
is meant to remove the free timestamps from the page_owner output and
fix the page_owner_sort tool so proper collation can occur.

Audra Mitchell (5):
  mm/page_owner: Remove free_ts from page_owner output
  tools/mm: Remove references to free_ts from page_owner_sort
  tools/mm: Filter out timestamps for correct collation
  tools/mm: Fix the default case for page_owner_sort
  tools/mm: Update the usage output to be more organized

 mm/page_owner.c            |   4 +-
 tools/mm/page_owner_sort.c | 212 +++++++++++++++++--------------------
 2 files changed, 100 insertions(+), 116 deletions(-)

-- 
2.41.0