[SRU][F:aws][PATCH v2 0/1] Set CONFIG_LOG_BUF_SHIFT=18 on all 64bit arches

[Koichiro Den]

BugLink: https://bugs.launchpad.net/bugs/2085493

SRU Justification:

[Impact]

CONFIG_LOG_BUF_SHIFT has been kept at 14 on arm64 instances. The small
log_buf has led to sporadic test failures (see LP#2085493). Furthermore,
since it can easily fill up before systemd-journald starts, some boot
kernel log messages may be lost. Align the settings with master kernel
for simplicity's sake, including other architectures.

[Fix]

Set CONFIG_LOG_BUF_SHIFT=18, which is sufficient in normal
circumstances.

[Test Plan]

Boot testing suffices.
I have tested with log_buf_len=256K on b:linux-aws-5.4 and confirmed that the
sporadic failures observed in LP#2085493 disappeared.

[Where problems could occur]

Raising the size of the log_buf will increase kernel memory usage
which cannot be reclaimed. On arm64 instance types, the size will
increase from 16 KB to 256 KB. Users who want to keep it at 16 KB
might need to explicitly set log_buf_len= kernel parameter.

[Notes]

v2:
  - fix BugLink in commit message + fix subject


Koichiro Den (1):
  UBUNTU: [Config] aws: CONFIG_LOG_BUF_SHIFT=18 on all 64bit arches

 debian.aws/config/annotations | 1 -
 1 file changed, 1 deletion(-)

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