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Message-ID: <CA+icZUWtEHy3CLadSQBKT5++UOxJuV-uxFf=UdAZLqysfourzw@mail.gmail.com> Date: Fri, 30 Aug 2013 19:11:26 +0200 From: Sedat Dilek <sedat.dilek@...il.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Waiman Long <waiman.long@...com>, Ingo Molnar <mingo@...nel.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Alexander Viro <viro@...iv.linux.org.uk>, Jeff Layton <jlayton@...hat.com>, Miklos Szeredi <mszeredi@...e.cz>, Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Andi Kleen <andi@...stfloor.org>, "Chandramouleeswaran, Aswin" <aswin@...com>, "Norton, Scott J" <scott.norton@...com> Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount On Fri, Aug 30, 2013 at 6:52 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > On Fri, Aug 30, 2013 at 9:37 AM, Sedat Dilek <sedat.dilek@...il.com> wrote: >> >> Where is this a.out file from or how to generate it? > > Oh, that's just the silly threaded test-binary. I don't know what you > called it. > > As to your config options, yesh, you have some expensive stuff. > DEBUG_OBJECTS and DEBUG_MUTEXES in particular tend to cause lots of > horrible performance issues. I didn't check if there might be other > things.. > There is no -f option for record but for report, so I swapped them: $ sudo ~/src/linux-kernel/linux/tools/perf/perf record -e cycles:pp ./scripts/t_lockref_from-linus Total loops: 2240273 [ perf record: Woken up 25 times to write data ] [ perf record: Captured and wrote 6.080 MB perf.data (~265641 samples) ] $ sudo ~/src/linux-kernel/linux/tools/perf/perf report -f Samples: 159K of event 'cycles:pp', Event count (approx.): 76535356682 84,10% t_lockref_from- [kernel.kallsyms] [k] check_poison_obj 5,22% t_lockref_from- [kernel.kallsyms] [k] memset 1,15% t_lockref_from- [kernel.kallsyms] [k] irq_return 0,45% t_lockref_from- [kernel.kallsyms] [k] kmem_cache_alloc 0,44% t_lockref_from- [kernel.kallsyms] [k] kmem_cache_free 0,36% t_lockref_from- [kernel.kallsyms] [k] __ticket_spin_lock 0,35% t_lockref_from- [kernel.kallsyms] [k] cache_free_debugcheck 0,35% t_lockref_from- [kernel.kallsyms] [k] __acct_update_integrals 0,34% t_lockref_from- [kernel.kallsyms] [k] user_exit 0,33% t_lockref_from- [kernel.kallsyms] [k] __d_lookup_rcu 0,26% t_lockref_from- libc-2.15.so [.] __xstat64 0,25% t_lockref_from- [kernel.kallsyms] [k] poison_obj 0,24% t_lockref_from- [kernel.kallsyms] [k] local_clock 0,19% t_lockref_from- [kernel.kallsyms] [k] lockref_get_or_lock 0,19% t_lockref_from- [kernel.kallsyms] [k] link_path_walk 0,19% t_lockref_from- [kernel.kallsyms] [k] rcu_eqs_enter_common.isra.43 0,19% t_lockref_from- [kernel.kallsyms] [k] rcu_eqs_exit_common.isra.41 0,17% t_lockref_from- [kernel.kallsyms] [k] native_read_tsc 0,17% t_lockref_from- [kernel.kallsyms] [k] user_enter 0,16% t_lockref_from- [kernel.kallsyms] [k] sched_clock_cpu 0,16% t_lockref_from- [kernel.kallsyms] [k] path_lookupat 0,14% t_lockref_from- [kernel.kallsyms] [k] vfs_getattr 0,14% t_lockref_from- [kernel.kallsyms] [k] lockref_put_or_lock 0,14% t_lockref_from- [kernel.kallsyms] [k] path_init 0,13% t_lockref_from- [kernel.kallsyms] [k] tracesys 0,13% t_lockref_from- [kernel.kallsyms] [k] native_sched_clock 0,13% t_lockref_from- [kernel.kallsyms] [k] strncpy_from_user 0,12% t_lockref_from- [kernel.kallsyms] [k] cp_new_stat 0,12% t_lockref_from- [kernel.kallsyms] [k] cache_alloc_debugcheck_after.isra.61 0,12% t_lockref_from- [kernel.kallsyms] [k] account_system_time 0,12% t_lockref_from- [kernel.kallsyms] [k] copy_user_generic_unrolled 0,12% t_lockref_from- [kernel.kallsyms] [k] syscall_trace_enter 0,12% t_lockref_from- [kernel.kallsyms] [k] jiffies_to_timeval 0,11% t_lockref_from- [kernel.kallsyms] [k] get_vtime_delta 0,11% t_lockref_from- t_lockref_from-linus [.] __stat 0,10% t_lockref_from- [kernel.kallsyms] [k] check_irq_off 0,10% t_lockref_from- [kernel.kallsyms] [k] common_perm 0,10% t_lockref_from- [kernel.kallsyms] [k] lookup_fast 0,09% t_lockref_from- [kernel.kallsyms] [k] getname_flags 0,09% t_lockref_from- [kernel.kallsyms] [k] syscall_trace_leave 0,08% t_lockref_from- t_lockref_from-linus [.] start_routine 0,08% t_lockref_from- [kernel.kallsyms] [k] vfs_fstatat 0,08% t_lockref_from- [kernel.kallsyms] [k] system_call_after_swapgs 0,08% t_lockref_from- [kernel.kallsyms] [k] user_path_at_empty 0,08% t_lockref_from- [kernel.kallsyms] [k] account_user_time 0,07% t_lockref_from- [kernel.kallsyms] [k] generic_fillattr 0,07% t_lockref_from- [kernel.kallsyms] [k] complete_walk 0,06% t_lockref_from- [kernel.kallsyms] [k] security_inode_getattr 0,06% t_lockref_from- [kernel.kallsyms] [k] _raw_spin_lock 0,06% t_lockref_from- [kernel.kallsyms] [k] rcu_eqs_exit 0,06% t_lockref_from- [kernel.kallsyms] [k] vtime_account_user 0,06% t_lockref_from- [kernel.kallsyms] [k] dput 0,06% t_lockref_from- [kernel.kallsyms] [k] rcu_eqs_enter 0,06% t_lockref_from- [kernel.kallsyms] [k] __virt_addr_valid - Sedat - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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