[Patch 0/1] Enable user-space breakpoint requests using PID

[K.Prasad]

Hi All,
Please find a patch that enables user-space breakpoints to be
requested using the 'pid' of a process.

The breakpoint request, thus received, is active over all threads of
the process (all task_structs having the same 'tgid') and on any new
threads that get spawned eventually.

Given that the 'pid' of a process is more visible (than its
task_struct), such an interface is expected to be useful to
debuggers/tracers (such as SystemTap).

The patch is based on commit 7818b3d0fc68f5c2a85fed86d9fa37131c5a3068 of
-tip tree. It has been tested with a hack to the -tip kernel code (that
comments out all references to event->filp) due to a bug in the
perf-events code (reported here 2009121717...@in.ibm.com).

Thanks,
K.Prasad

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