linux-kernel - [PATCH v4 0/5] tracing: Introduce configurable ring sub buffer size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211213095002.62110-1-tz.stoyanov@gmail.com>
Date:   Mon, 13 Dec 2021 11:49:57 +0200
From:   "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@...il.com>
To:     rostedt@...dmis.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/5] tracing: Introduce configurable ring sub buffer size

From: "Tzvetomir Stoyanov (VMware)" <tstoyanov@...are.com>

Currently the size of one sub buffer page is global for all buffers and it
is hard coded to one system page. The patch set introduces configurable
ring buffer sub page size, per ring buffer. A new user space interface is
introduced, which allows to change the sub page size of the ftrace buffer, per
ftrace instance.

[Resend to LKML]

v4 changes:
 - Do not change the sub buffer size of the temp event buffer per CPU,
   trace_buffered_event. That size if fixed to one system page.
v3 changes:
 - Fixed ring buffer readers and writers to work with custom sub buffer page
   size.
v2 changes:
 - Split code refactoring in a separate patch.
 - Changed the logic to work with order of system pages, instead of page
   size.
 - Fix freeing of the allocated pages, to take into account the actual order.
 - Code clean ups.
 - Bug fixes.

Tzvetomir Stoyanov (VMware) (5):
  [RFC] tracing: Refactor ring buffer implementation
  [RFC] tracing: Page size per ring buffer
  [RFC] tracing: Add interface for configuring trace sub buffer size
  [RFC] tracing: Set new size of the ring buffer sub page
  [RFC] tracing: Read and write to ring buffers with custom sub buffer
    size

 include/linux/ring_buffer.h          |  17 +-
 kernel/trace/ring_buffer.c           | 345 ++++++++++++++++++++-------
 kernel/trace/ring_buffer_benchmark.c |  10 +-
 kernel/trace/trace.c                 |  84 +++++--
 kernel/trace/trace.h                 |   1 +
 kernel/trace/trace_events.c          |  50 +++-
 6 files changed, 392 insertions(+), 115 deletions(-)

-- 
2.31.1