tree 1c8a3d03fcb0e620c8f2244962fb249cff51fec4
parent 4722dc52a891ab6cb2d637ddb87233e0ce277827
author Jens Axboe <jens.axboe@oracle.com> 1211978733 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1211978967 +0200

block: make blktrace use per-cpu buffers for message notes

Currently it uses a single static char array, but that risks
being corrupted when multiple users issue message notes at the
same time. Make the buffers dynamically allocated when the trace
is setup and make them per-cpu instead.

The default max message size of 1k is also very large, the
interface is mainly for small text notes. So shrink it to 128 bytes.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>