centos man page for trace_block_bio_bounce

TRACE_BLOCK_BIO_BOUN(9) 					     Block IO						   TRACE_BLOCK_BIO_BOUN(9)

NAME
       trace_block_bio_bounce - used bounce buffer when processing block operation

SYNOPSIS
       void trace_block_bio_bounce(struct request_queue * q, struct bio * bio);

ARGUMENTS
       q
	   queue holding the block operation

       bio
	   block operation

DESCRIPTION
       A bounce buffer was used to handle the block operation bio in q. This occurs when hardware limitations prevent a direct transfer of data
       between the bio data memory area and the IO device. Use of a bounce buffer requires extra copying of data and decreases performance.

AUTHORS
       Jason Baron <jbaron@redhat.com>
	   Author.

       William Cohen <wcohen@redhat.com>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   TRACE_BLOCK_BIO_BOUN(9)