[PATCH -tip 0/5] kprobes: batch (un)optimization support
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From: Masami Hiramatsu on 10 May 2010 13:50 Hi, Since current kprobes jump optimization calls stop_machine() for each probe, it will almost freeze machine when registering a lot of probes (~1000) at once. For avoiding this issue, this patch series enhances kprobes and text_poke. - Introduces text_poke_smp_batch() which modifies multiple codes with one stop_machine(). - Limits how many probes can be optimized at once. - Introduce delayed unoptimization for batch processing. text_poke_smp_batch() also helps Jason's Jump label to reduce its overhead coming from text_poke_smp(). Currently, this patch allocates working memory static, however, it is possible to allocate dynamically, because its not in a critical section. it will be done by the next step, or next version. Thank you, --- Masami Hiramatsu (5): kprobes: Support delayed unoptimization kprobes/x86: Use text_poke_smp_batch x86: Introduce text_poke_smp_batch() for batch-code modifying kprobes: Limit maximum number of optimization at once [CLEANUP] kprobes: Remove redundant text_mutex lock in optimize arch/x86/include/asm/alternative.h | 7 + arch/x86/include/asm/kprobes.h | 4 arch/x86/kernel/alternative.c | 49 +++- arch/x86/kernel/kprobes.c | 78 ++++++ include/linux/kprobes.h | 4 kernel/kprobes.c | 437 ++++++++++++++++++++++++------------ 6 files changed, 416 insertions(+), 163 deletions(-) -- Masami Hiramatsu e-mail: mhiramat(a)redhat.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |