probe::nfsd.read(3stap) [debian man page]

probe::nfsd.read

PROBE::NF(3stap)					   Network File Storage Tapsets 					  PROBE::NF(3stap)

NAME

       probe::nfsd.read - NFS server reading data from a file for client

SYNOPSIS

       nfsd.read

VALUES

       count
	   read bytes

       file
	   argument file, indicates if the file has been opened.

       size
	   read bytes

       vec
	   struct kvec, includes buf address in kernel address and length of each buffer

       fh
	   file handle (the first part is the length of the file handle)

       client_ip
	   the ip address of client

       vlen
	   read blocks

       offset
	   the offset of file

SystemTap Tapset Reference					     May 2013							  PROBE::NF(3stap)

PROBE::IOBLOCK_TRACE(3stap)				  IO Scheduler and block IO Taps			       PROBE::IOBLOCK_TRACE(3stap)

NAME

       probe::ioblock_trace.bounce - Fires whenever a buffer bounce is needed for at least one page of a block IO request.

SYNOPSIS

       ioblock_trace.bounce

VALUES

       None

DESCRIPTION

       name - name of the probe point q - request queue on which this bio was queued.  devname - device for which a buffer bounce was needed.  ino
       - i-node number of the mapped file bytes_done - number of bytes transferred sector - beginning sector for the entire bio flags - see below
       BIO_UPTODATE 0 ok after I/O completion BIO_RW_BLOCK 1 RW_AHEAD set, and read/write would block BIO_EOF 2 out-out-bounds error BIO_SEG_VALID
       3 nr_hw_seg valid BIO_CLONED 4 doesn't own data BIO_BOUNCED 5 bio is a bounce bio BIO_USER_MAPPED 6 contains user pages BIO_EOPNOTSUPP 7
       not supported rw - binary trace for read/write request vcnt - bio vector count which represents number of array element (page, offset,
       length) which makes up this I/O request idx - offset into the bio vector array phys_segments - number of segments in this bio after
       physical address coalescing is performed.  size - total size in bytes bdev - target block device bdev_contains - points to the device
       object which contains the partition (when bio structure represents a partition) p_start_sect - points to the start sector of the partition
       structure of the device

CONTEXT

       The process creating a block IO request.

SystemTap Tapset Reference					     June 2014					       PROBE::IOBLOCK_TRACE(3stap)