trace_block_bio_bounce(9) 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 <[email protected]>

Author.

William Cohen <[email protected]>

Author.

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