TRACE_BLOCK_BIO_BOUN

Section: Block IO (9)
Updated: February 2011
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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

: 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>