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 AT redhat.com>
           Author.

       William Cohen <wcohen AT redhat.com>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                    TRACE_BLOCK_SLEEPRQ(9)