[SYSTEMTAP/PATCH v2 0/6] RT aware systemtap patch set

[Santosh Shukla <sshukla at mvista dot com>]

Hi,

This is a v2 version of -rt aware systemtap patchset, tested for 3.14.12-rt9 and for 3.10.40-rt38 kernel version.
For v1->v2 related details refer [1]. Patchset based on stap upstream link [2] master branch.

Change summary;

v1->v2 :

- added Locking helper api. tested for -rt and voluntary mode, works fine.
- reverted v1 change of rd/wr lock with rcu to raw_spinlock in this patch, that
  is beacuse for rcu to effectively get in use in stap modules like utrace.c
and task_finder.c, require to make desing change in general. However it would
improve the performance,
- Removed v1's adder_map patch set, as it wasn't troubling -rt mode.

Test script used for testing :
/usr/local/stap/bin/stap -v testsuite/systemtap.examples/network/netdev.stp
/usr/local/stap/bin/stap -v testsuite/systemtap.examples/network/tcpdumplike.stp

Few other test example script used :
cat ../test-indent.stp
probe kernel.function("*@net/socket.c").call
{
                  printf ("%s -> %s\n", thread_indent(1), probefunc())
}
probe kernel.function("*@net/socket.c").return
{
                  printf ("%s <- %s\n", thread_indent(-1), probefunc())
}


Like know feedback, comment on patch set. also Does it make sense to maintain
systemtap -rt version in upstream.. do we care?

[1] http://sourceware-org.1504.n7.nabble.com/SYSTEMTAP-PATCH-0-4-RT-aware-systemtap-patch-set-td282463.html
[2] git://sourceware.org/git/systemtap.git; branch master 


Santosh Shukla (6):
  stp: rt: locking helper api
  stp: rt: replace __stp_tf_map_lock rd/wr lock with stp style raw lock
  stp: rt: replace __stp_tf_vma_lock rd/wr lock with stp style of raw
    lock
  stp: rt: replace utrace->lock with stp style raw lock
  stp: rt: replace utrace_struct lock to stp style raw lock
  stp: rt: replace __stp_tf_task_work_list_lock to stp raw

 runtime/linux/task_finder2.c    |  14 +++---
 runtime/linux/task_finder_map.c |  27 ++++++-----
 runtime/stp_helper_lock.h       |  80 +++++++++++++++++++++++++++++++
 runtime/stp_utrace.c            | 103 ++++++++++++++++++++--------------------
 runtime/task_finder_vma.c       |  33 ++++++-------
 5 files changed, 170 insertions(+), 87 deletions(-)
 create mode 100644 runtime/stp_helper_lock.h

-- 
1.8.3.1