---
name: "trace_block_bio_bounce"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/trace_block_bio_bounce"
---

# trace\_block\_bio\_bounce(9)

used bounce buffer when processing block operation

## 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