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Date: Mon, 11 Jun 2012 12:59:15 +0800 From: "Peter Huang(Peng)" <peter.huangpeng@...wei.com> To: <linux-kernel@...r.kernel.org> Subject: _spin_unlock_irqrestore() has very high sampling rate when using oprofile tool. During TPC-C testing on IA64 platform, we binded LGWR process to 1 cpu, and find that sys% is over 50%. With oprofile we find that _spin_unlock_irqrestore() rated over 31%, and try_to_wake_up() caused this. I don't understand why unlock operation has high sampling rate, is there anybody know about this? Thanks. -sampling result CPU: Itanium 2, speed 1.598e+06 MHz (estimated) Counted CPU_CYCLES events (CPU Cycles) with a unit mask of 0x00 (No unit mask) count 75000 samples % app name symbol name 53204 31.4940 vmlinux _spin_unlock_irqrestore 19788 11.7135 oracle kcrfw_redo_write 12804 7.5793 oracle $_1$kslpstevent$TAG$GLOB 12004 7.1057 vmlinux search_module_extables 8859 5.2441 vmlinux search_extable 8150 4.8244 vmlinux try_atomic_semop 6121 3.6233 vmlinux update_queue 4402 2.6058 scsi_mod /scsi_mod 3698 2.1890 vmlinux ring_buffer_consume 3069 1.8167 vmlinux default_idle 2122 1.2561 oprofile /oprofile -callgraph CPU: Itanium 2, speed 1.598e+06 MHz (estimated) Counted CPU_CYCLES events (CPU Cycles) with a unit mask of 0x00 (No unit mask) count 75000 samples % image name app name symbol name ------------------------------------------------------------------------------- 1 0.0021 vmlinux vmlinux cpufreq_cpu_get 1 0.0021 vmlinux vmlinux sys_pfm_start 1 0.0021 vmlinux vmlinux try_to_del_timer_sync 1 0.0021 vmlinux vmlinux prepare_to_wait 2 0.0041 vmlinux vmlinux set_cpus_allowed_ptr 3 0.0062 vmlinux vmlinux cpu_quiet_msk 3 0.0062 vmlinux vmlinux delayacct_end 3 0.0062 vmlinux vmlinux __wake_up 4 0.0082 vmlinux vmlinux rcu_process_gp_end 4 0.0082 vmlinux vmlinux credit_entropy_bits 6 0.0123 vmlinux vmlinux __queue_work 6 0.0123 vmlinux vmlinux mod_timer 23 0.0472 vmlinux vmlinux dio_bio_end_aio 26 0.0534 vmlinux vmlinux __blockdev_direct_IO 37 0.0760 vmlinux vmlinux dio_bio_submit 38 0.0780 vmlinux vmlinux add_wait_queue_exclusive 44 0.0903 vmlinux vmlinux remove_wait_queue 165 0.3388 vmlinux vmlinux blk_run_queue 529 1.0862 vmlinux vmlinux mix_pool_bytes_extract 697 1.4312 vmlinux vmlinux blk_end_bidi_request 783 1.6077 vmlinux vmlinux aio_complete 46325 95.1193 vmlinux vmlinux try_to_wake_up 53204 31.4940 vmlinux vmlinux _spin_unlock_irqrestore -- 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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