Kris Van Hees [Mon, 14 Nov 2011 15:17:45 +0000 (10:17 -0500)]
Enable processing the SDT probe point info at boot time (before SMP is actually
enabled), if DTrace SDT support has been enabled (built-in or as module). For
now, provide some verbose info on the probe points getting resolved.
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Kris Van Hees [Fri, 11 Nov 2011 07:34:04 +0000 (02:34 -0500)]
Fix resolving addresses of relocation records for SDT probe points. The
addresses were being calculated based on the wrong starting point (_stext
whereas it ought to be _text), and the base was not taken into account.
Fixed the writing of NOPs in the location of the probe point calls, since
the existing case was causing kernel paging faults. Made the add_nops()
function in alternative.c non-static so it can be used in sdt_register.
Use add_nops() to select the most appropriate NOP sequence for replacing the
probe point call, and write the NOPs using text_poke().
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Kris Van Hees [Thu, 3 Nov 2011 17:59:00 +0000 (13:59 -0400)]
Fixed the allocation of cyclics that was the cuase for some obscure crashes
during the testsuite execution. Problem was that cyclics were being allocated
in chunks, with a new array being allocated as (prev-size + chink-size), and
then the old entries being copied over. However, because the hrtimer struct is
embedded in the cyclic struct, this meant that hrtimer structs were being moved
outside the hrtimer code.
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Kris Van Hees [Thu, 27 Oct 2011 17:15:26 +0000 (13:15 -0400)]
Handle the case where regs (during cyclic processing) is NULL. This indicates
a bug but with this code change we'll survive that case and simply not have
meaningful PC and UPC values as argument to the probe, which is better than a
full scale OOPS due to NULL pointer dereference.
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Kris Van Hees [Thu, 27 Oct 2011 14:39:19 +0000 (10:39 -0400)]
Implementation for tracing stub-based system calls. Due to the need for
specialized code handling (mainly passing in a pt_regs structure as one of
the arguments), some syscalls are called through a stub in assembly code.
We duplicate the stub cdode in dtrace_stubs_x86_64.S, but instead of calling
the actual syscall implementation code call our own syscall-specific handler,
which ensures that entry and return probes are called as enabled, and then
call the underlying implementation directly for handling the syscall.
Also removed debugging output that is no longer relevant (code cleanup).
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Kris Van Hees [Fri, 14 Oct 2011 02:42:27 +0000 (22:42 -0400)]
Stacktrace dumping has been moved to the GPL-licensed dtrace_os.c because it
depends on a symbol that is exported as GPL-only. Functionality in dtrace_isa
that requires stacktrace dumping can now use dtrace_stacktrace().
The GPL-licensed dtrace_os.h C header file is now made available through the
/include/linux hierarchy, and it is included in dtrace.h.
Fixed a bug in dtrace_relocs.c where section names where copied into a memory
area that was 1 byte short, causing various unpleasant forms of behaviour.
Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Nick Alcock [Mon, 3 Oct 2011 16:20:15 +0000 (17:20 +0100)]
Finish GPL/CDDL splitting work.
kernel/dtrace and all that it #includes is now GPLv2, with the aid of a new
systrace_os.h header containing the subset of systrace.h needed by the GPL shim.
Conversely, dtrace/ is entirely CDDL.
dtrace_ioctl.h is now an exported, header in include/linux/, to ease future
sharing by the userspace side. It is probably not copyrightable (as is essential
for interoperability and contains no creative elements), but if it has any license
at all it is GPLv2 like the other headers in that directory (many of which are
include them.)
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Nick Alcock [Fri, 30 Sep 2011 17:55:09 +0000 (18:55 +0100)]
Initial commit of DTrace.
Build via a simple 'make' if you're already running this kernel, or via 'make
KERNELDIR=/path/to/kernel/top/level' otherwise. Installed via 'make install'.
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
projects / users / jedix / linux-maple.git / log