user/sven/linux.git/include/linux/kprobes.h, branch tmp/leds/core

kprobes: fix module compilation error with CONFIG_KPROBES=n

2009-01-30T02:04:43Z

Define kprobes related data structures even if CONFIG_KPROBES is not set. This fixes compilation errors which occur if CONFIG_KPROBES is not set, in kprobe using modules. [akpm@linux-foundation.org: fix build for non-kprobes-supporting architectures] Reviewed-by: Ananth N Mavinakayanahalli Signed-off-by: Masami Hiramatsu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: support probing module __exit function

2009-01-06T23:59:21Z

Allows kprobes to probe __exit routine. This adds flags member to struct kprobe. When module is freed(kprobes hooks module_notifier to get this event), kprobes which probe the functions in that module are set to "Gone" flag to the flags member. These "Gone" probes are never be enabled. Users can check the GONE flag through debugfs. This also removes mod_refcounted, because we couldn't free a module if kprobe incremented the refcount of that module. [akpm@linux-foundation.org: document some locking] [mhiramat@redhat.com: bugfix: pass aggr_kprobe to arch_remove_kprobe] [mhiramat@redhat.com: bugfix: release old_p's insn_slot before error return] Signed-off-by: Masami Hiramatsu Acked-by: Ananth N Mavinakayanahalli Cc: Anil S Keshavamurthy Signed-off-by: Masami Hiramatsu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: add kprobe_insn_mutex and cleanup arch_remove_kprobe()

2009-01-06T23:59:20Z

Add kprobe_insn_mutex for protecting kprobe_insn_pages hlist, and remove kprobe_mutex from architecture dependent code. This allows us to call arch_remove_kprobe() (and free_insn_slot) while holding kprobe_mutex. Signed-off-by: Masami Hiramatsu Acked-by: Ananth N Mavinakayanahalli Cc: Anil S Keshavamurthy Cc: Russell King Cc: "Luck, Tony" Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ftrace: ignore functions that cannot be kprobe-ed

2008-10-14T08:34:22Z

kprobes already has an extensive list of annotations for functions that should not be instrumented. Add notrace annotations to these functions as well. This is particularly useful for functions called by the NMI path. Signed-off-by: Ingo Molnar

kprobes: improve kretprobe scalability with hashed locking

2008-07-25T17:53:30Z

Currently list of kretprobe instances are stored in kretprobe object (as used_instances,free_instances) and in kretprobe hash table. We have one global kretprobe lock to serialise the access to these lists. This causes only one kretprobe handler to execute at a time. Hence affects system performance, particularly on SMP systems and when return probe is set on lot of functions (like on all systemcalls). Solution proposed here gives fine-grain locks that performs better on SMP system compared to present kretprobe implementation. Solution: 1) Instead of having one global lock to protect kretprobe instances present in kretprobe object and kretprobe hash table. We will have two locks, one lock for protecting kretprobe hash table and another lock for kretporbe object. 2) We hold lock present in kretprobe object while we modify kretprobe instance in kretprobe object and we hold per-hash-list lock while modifying kretprobe instances present in that hash list. To prevent deadlock, we never grab a per-hash-list lock while holding a kretprobe lock. 3) We can remove used_instances from struct kretprobe, as we can track used instances of kretprobe instances using kretprobe hash table. Time duration for kernel compilation ("make -j 8") on a 8-way ppc64 system with return probes set on all systemcalls looks like this. cacheline non-cacheline Un-patched kernel aligned patch aligned patch =============================================================================== real 9m46.784s 9m54.412s 10m2.450s user 40m5.715s 40m7.142s 40m4.273s sys 2m57.754s 2m58.583s 3m17.430s =========================================================== Time duration for kernel compilation ("make -j 8) on the same system, when kernel is not probed. ========================= real 9m26.389s user 40m8.775s sys 2m7.283s ========================= Signed-off-by: Srinivasa DS Signed-off-by: Jim Keniston Acked-by: Ananth N Mavinakayanahalli Cc: Anil S Keshavamurthy Cc: David S. Miller Cc: Masami Hiramatsu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: enable clean usage of get_kprobe

2008-06-23T20:10:57Z

Allow clean use of get_kprobe() outside of core kprobe code. Ftrace makes use of get_kprobe to identify probes installed on mcount call-sites. Signed-off-by: Abhishek Sagar Acked-by: Ananth N Mavinakayanahalli Cc: Masami Hiramatsu Cc: jkenisto@us.ibm.com Cc: Steven Rostedt Signed-off-by: Ingo Molnar

kprobes: add (un)register_jprobes for batch registration

2008-04-28T15:58:32Z

Introduce unregister_/register_jprobes() for jprobe batch registration. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Jim Keniston Cc: Prasanna S Panchamukhi Cc: Shaohua Li Cc: David Miller Cc: "Frank Ch. Eigler" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: add (un)register_kretprobes for batch registration

2008-04-28T15:58:32Z

Introduce unregister_/register_kretprobes() for kretprobe batch registration. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Jim Keniston Cc: Prasanna S Panchamukhi Cc: Shaohua Li Cc: David Miller Cc: "Frank Ch. Eigler" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: add (un)register_kprobes for batch registration

2008-04-28T15:58:32Z

Introduce unregister_/register_kprobes() for kprobe batch registration. This can reduce waiting time for synchronized_sched() when a lot of probes have to be unregistered at once. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Jim Keniston Cc: Prasanna S Panchamukhi Cc: Shaohua Li Cc: David Miller Cc: "Frank Ch. Eigler" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kprobes: prevent probing of preempt_schedule()

2008-04-28T15:58:32Z

Prohibit users from probing preempt_schedule(). One way of prohibiting the user from probing functions is by marking such functions with __kprobes. But this method doesn't work for those functions, which are already marked to different section like preempt_schedule() (belongs to __sched section). So we use blacklist approach to refuse user from probing these functions. In blacklist approach we populate the blacklisted function's starting address and its size in kprobe_blacklist structure. Then we verify the user specified address against start and end of the blacklisted function. So any attempt to register probe on blacklisted functions will be rejected. [akpm@linux-foundation.org: build fix] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Srinivasa DS Signed-off-by: Ananth N Mavinakayanahalli Signed-off-by: Jim Keniston Cc: Dave Hansen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds