linux-kernel - [PATCH v4 00/10] kunit: Add dynamically-extending log

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Date:   Mon, 14 Aug 2023 14:22:59 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <brendan.higgins@...ux.dev>, <davidgow@...gle.com>,
        <rmoar@...gle.com>
CC:     <linux-kselftest@...r.kernel.org>, <kunit-dev@...glegroups.com>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH v4 00/10] kunit: Add dynamically-extending log

This patch chain changes the logging implementation to use string_stream
so that the log will grow dynamically.

The first 8 patches add test code for string_stream, and make some
changes to string_stream needed to be able to use it for the log.

The final patch adds a performance report of string_stream.

CHANGES SINCE V3:

Completely rewritten to use string_stream instead of implementing a
separate extending-buffer implementation for logging.

I have used the performance test from the final patch on my original
fixed-size-fragment implementation from V3 to get a comparison of the
two implementations (run on i3-8145UE CPU @ 2.20GHz):

                        string_stream     V3 fixed-size-buffer
Time elapsed:           7748 us           3251 us
Total string length:    573890            573890
Bytes requested:        823994            728336
Actual bytes allocated: 1061440           728352

I don't think the difference is enough to be worth complicating the
string_stream implementation with my fixed-fragment implementation from
V3 of this patch chain.

Richard Fitzgerald (10):
  kunit: string-stream: Improve testing of string_stream
  kunit: string-stream: Don't create a fragment for empty strings
  kunit: string-stream: Add cases for adding empty strings to a
    string_stream
  kunit: string-stream: Add option to make all lines end with newline
  kunit: string-stream: Add cases for string_stream newline appending
  kunit: string-stream: Pass struct kunit to string_stream_get_string()
  kunit: string-stream: Decouple string_stream from kunit
  kunit: string-stream: Add test for freeing resource-managed
    string_stream
  kunit: Use string_stream for test log
  kunit: string-stream: Test performance of string_stream

 include/kunit/test.h           |  14 +-
 lib/kunit/Makefile             |   5 +-
 lib/kunit/debugfs.c            |  36 ++-
 lib/kunit/kunit-test.c         |  52 +---
 lib/kunit/log-test.c           |  72 ++++++
 lib/kunit/string-stream-test.c | 447 +++++++++++++++++++++++++++++++--
 lib/kunit/string-stream.c      | 129 +++++++---
 lib/kunit/string-stream.h      |  22 +-
 lib/kunit/test.c               |  48 +---
 9 files changed, 656 insertions(+), 169 deletions(-)
 create mode 100644 lib/kunit/log-test.c

-- 
2.30.2