linux-kernel - [PATCH 0/4] Lockdep: Reduce stack trace memory usage

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Date:   Mon, 22 Jul 2019 11:24:39 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Bart Van Assche <bvanassche@....org>
Subject: [PATCH 0/4] Lockdep: Reduce stack trace memory usage

Hi Peter,

An unfortunate side effect of commit 669de8bda87b ("kernel/workqueue: Use
dynamic lockdep keys for workqueues") is that all stack traces associated
with the lockdep key are leaked when a workqueue is destroyed. Fix this by
storing each unique stack trace once. Please consider this patch series
for Linux kernel v5.4.

Thanks,

Bart.

Bart Van Assche (4):
  locking/lockdep: Make it clear that what lock_class::key points at is
    not modified
  stacktrace: Constify 'entries' arguments
  locking/lockdep: Reduce space occupied by stack traces
  locking/lockdep: Report more stack trace statistics

 include/linux/lockdep.h            |  11 +-
 include/linux/stacktrace.h         |   4 +-
 kernel/locking/lockdep.c           | 159 ++++++++++++++++++++++-------
 kernel/locking/lockdep_internals.h |   9 +-
 kernel/locking/lockdep_proc.c      |   8 +-
 kernel/stacktrace.c                |   4 +-
 6 files changed, 143 insertions(+), 52 deletions(-)

-- 
2.22.0.657.g960e92d24f-goog