kernel.git/arch/x86/kernel/ds.c, branch linux-2.6.30.y

x86, pebs: correct qualifier passed to ds_write_config() from ds_request_pebs()

2009-03-06T15:13:15Z

ds_write_config() can write the BTS as well as the PEBS part of the DS config. ds_request_pebs() passes the wrong qualifier, which results in the wrong configuration to be written. Reported-by: Stephane Eranian Signed-off-by: Markus Metzger LKML-Reference: <20090305085721.A22550@sedona.ch.intel.com> Signed-off-by: Ingo Molnar

x86, bts: remove bad warning

2009-03-06T15:13:15Z

In case a ptraced task is reaped (while the tracer is still attached), ds_exit_thread() is called before ptrace_exit(). The latter will release the bts_tracer and remove the thread's ds_ctx. The former will WARN() if the context is not NULL. Oleg Nesterov submitted patches that move ptrace_exit() before exit_thread() and thus reverse the order of the above calls. Remove the bad warning. I will add it again when Oleg's changes are in. Signed-off-by: Markus Metzger LKML-Reference: <20090305084954.A22000@sedona.ch.intel.com> Signed-off-by: Ingo Molnar

x86, ds, bts: cleanup/fix DS configuration

2009-01-22T13:35:00Z

Cleanup the cpuid check for DS configuration. This also fixes a Corei7 CPUID enumeration bug. Signed-off-by: Markus Metzger Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

x86, bts: add fork and exit handling

2008-12-20T08:15:46Z

Impact: introduce new ptrace facility Add arch_ptrace_untrace() function that is called when the tracer detaches (either voluntarily or when the tracing task dies); ptrace_disable() is only called on a voluntary detach. Add ptrace_fork() and arch_ptrace_fork(). They are called when a traced task is forked. Clear DS and BTS related fields on fork. Release DS resources and reclaim memory in ptrace_untrace(). This releases resources already when the tracing task dies. We used to do that when the traced task dies. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar

x86, bts: correctly report invalid bts records

2008-12-16T17:28:37Z

Impact: change the reporting of empty BTS records Correctly report a cleared BTS record as invalid. Used to be reported as branch from 0 to 0. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar

x86, bts: remove recursion from get_context

2008-12-16T17:27:25Z

Impact: cleanup Optimistically allocate a DS context. It is extremely unlikely that one already existed. This simplifies the code a lot. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar

x86, bts: fix build error

2008-12-12T07:21:19Z

Impact: build fix arch/x86/kernel/ds.c: In function 'ds_request': arch/x86/kernel/ds.c:236: sorry, unimplemented: inlining failed in call to 'ds_get_context': recursive inlining but the recursion here is scary ... Signed-off-by: Ingo Molnar

x86, bts: provide in-kernel branch-trace interface

2008-12-12T07:08:12Z

Impact: cleanup Move the BTS bits from ptrace.c into ds.c. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar

x86, bts: turn BUG_ON into WARN_ON_ONCE

2008-12-12T07:08:10Z

Impact: make the ds code more debuggable Turn BUG_ON's into WARN_ON_ONCE. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar

x86, bts, ptrace: move BTS buffer allocation from ds.c into ptrace.c

2008-11-25T16:31:12Z

Impact: restructure DS memory allocation to be done by the usage site of DS Require pre-allocated buffers in ds.h. Move the BTS buffer allocation for ptrace into ptrace.c. The pointer to the allocated buffer is stored in the traced task's task_struct together with the handle returned by ds_request_bts(). Removes memory accounting code. Signed-off-by: Markus Metzger Signed-off-by: Ingo Molnar