TRACE_BLOCK_SLEEPRQ(9) Block IO TRACE_BLOCK_SLEEPRQ(9)
NAME
trace_block_sleeprq - waiting to get a free request entry in queue for block IO operation
SYNOPSIS
void trace_block_sleeprq(struct request_queue * q, struct bio * bio, int rw);
ARGUMENTS
q
queue for operation
bio
pending block IO operation
rw
low bit indicates a read (0) or a write (1)
DESCRIPTION
In the case where a request struct cannot be provided for queue q the process needs to wait for an request struct to become available. This
tracepoint event is generated each time the process goes to sleep waiting for request struct become available.
AUTHORS
Jason Baron <jbaron@redhat.com>
Author.
William Cohen <wcohen@redhat.com>
Author.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 TRACE_BLOCK_SLEEPRQ(9)
