tree 4ae7ccee2d980917d778e8f0ec66ee01f892e427
parent 519cf32c1961994c60fc34be04a16b28ba62b663
author Darrick J. Wong <darrick.wong@oracle.com> 1567205393 -0700
committer Darrick J. Wong <darrick.wong@oracle.com> 1572904210 -0800

xfs_scrub: implement deferred description string rendering

A flamegraph analysis of xfs_scrub runtimes showed that we spend 7-10%
of the program's userspace runtime rendering prefix strings in case we
want to show a message about something we're checking, whether or not
that string ever actually gets used.

For a non-verbose run on a clean filesystem, this work is totally
unnecessary.  We could defer the message catalog lookup and snprintf
call until we actually need that message, so build enough of a function
closure mechanism so that we can capture some location information when
its convenient and push that all the way to the edge of the call graph
and only when we need it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>