From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Cloos Subject: 2.6.33 high cpu usage Date: Tue, 02 Mar 2010 13:35:21 -0500 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" To: linux-btrfs@vger.kernel.org Return-path: List-ID: --=-=-= With the ATI bug I was hitting earlier fixed, only my btrfs partition continues to show high cpu usage for some operations. Rsync, git pull, git checkout and svn up are typicall operations which trigger the high cpu usage. As an example, this perf report is from using git checkout to change to a new branch; the change needed to checkout 208 files out of about 1600 total files. du(1) reports that the checkout is about 14 megs; the alternates for that tree have about 60 megs of git packs. As you can see btrfs_find_space_cluster(), find_next_bit() and find_next_zero_bit() use most of the sys cpu. That patterns seems to hold whenever I run perf top during such operations. Box is x86_32, pentium3m. --=-=-= Content-Disposition: inline; filename=mesh.report Content-Description: perf report of git checkout --track ... # Samples: 11372 # # Overhead Command Shared Object Symbol # ........ ....... .................. ...... # 42.75% git [kernel] [k] btrfs_find_space_cluster 34.59% git [kernel] [k] find_next_bit 14.01% git [kernel] [k] find_next_zero_bit 0.76% git libz.so.1.2.3 [.] inflate_fast 0.42% git [kernel] [k] find_extent_buffer 0.34% git [kernel] [k] find_free_extent 0.28% git git [.] blk_SHA1_Block 0.26% git libz.so.1.2.3 [.] adler32 0.26% git [kernel] [k] test_range_bit 0.23% git [kernel] [k] scsi_dispatch_cmd 0.22% git [kernel] [k] div64_u64 0.21% git [kernel] [k] generic_bin_search 0.20% git [kernel] [k] __do_softirq 0.16% git [kernel] [k] get_page_from_freelist 0.16% git [ehci_hcd] [k] 0x00000000003c25 0.15% git [kernel] [k] read_extent_buffer 0.14% git [kernel] [k] btrfs_return_cluster_to_free_space 0.12% git [kernel] [k] btrfs_search_slot 0.12% git [kernel] [k] map_private_extent_buffer 0.11% git [kernel] [k] btrfs_clear_path_blocking 0.11% git [kernel] [k] set_extent_bit 0.11% git [kernel] [k] tree_search_offset 0.11% git [kernel] [k] __copy_from_user_ll 0.11% git git [.] patch_delta 0.08% git [kernel] [k] kmem_cache_alloc 0.08% git [kernel] [k] btrfs_alloc_from_cluster 0.08% git [kernel] [k] memmove 0.07% git [kernel] [k] __queue_work 0.07% git [kernel] [k] __extent_read_full_page 0.07% git [kernel] [k] alloc_extent_buffer 0.07% git [kernel] [k] scsi_request_fn 0.06% git libz.so.1.2.3 [.] inflate_table 0.06% git [kernel] [k] btrfs_unlock_up_safe 0.06% git [kernel] [k] memcpy_extent_buffer 0.06% git [kernel] [k] tree_insert 0.06% git [kernel] [k] __make_request 0.05% git [kernel] [k] block_group_cache_tree_search 0.05% git [kernel] [k] verify_parent_transid 0.05% git [kernel] [k] map_extent_buffer 0.04% git [kernel] [k] btrfs_header_nritems 0.04% git [kernel] [k] btrfs_tree_unlock 0.04% git [kernel] [k] do_page_fault 0.04% git libz.so.1.2.3 [.] .L207 0.04% git libz.so.1.2.3 [.] .L213 0.04% git git [.] cache_name_compare 0.04% git [kernel] [k] __rcu_process_callbacks 0.04% git [kernel] [k] __set_page_dirty_nobuffers 0.04% git [kernel] [k] kmem_cache_alloc_notrace 0.04% git [kernel] [k] bin_search 0.04% git [kernel] [k] unlock_up 0.04% git [kernel] [k] btrfs_reserve_extent 0.04% git [kernel] [k] btrfs_item_offset 0.04% git [kernel] [k] unmap_extent_buffer 0.04% git [kernel] [k] radix_tree_lookup_slot 0.04% git [kernel] [k] __lookup 0.04% git [kernel] [k] rb_erase 0.04% git [kernel] [k] tcp_transmit_skb 0.03% git libc-2.11.so [.] _int_malloc 0.03% git git [.] make_traverse_path 0.03% git [kernel] [k] __wake_up_bit 0.03% git [kernel] [k] handle_IRQ_event 0.03% git [kernel] [k] filemap_fault 0.03% git [kernel] [k] __remove_mapping 0.03% git [kernel] [k] __d_lookup 0.03% git [kernel] [k] btrfs_release_path 0.03% git [kernel] [k] btrfs_lock_root_node 0.03% git [kernel] [k] btrfs_put_block_group 0.03% git [kernel] [k] __btrfs_free_extent 0.03% git [kernel] [k] btrfs_mark_buffer_dirty 0.03% git [kernel] [k] inode_tree_add 0.03% git [kernel] [k] __tree_search 0.03% git [kernel] [k] btrfs_key_blockptr 0.03% git [kernel] [k] try_release_extent_buffer 0.03% git [kernel] [k] btrfs_tree_lock 0.03% git [kernel] [k] spin_unlock 0.03% git [kernel] [k] find_ref_head 0.03% git [kernel] [k] rb_next 0.02% git libc-2.11.so [.] _IO_vfprintf_internal 0.02% git libc-2.11.so [.] _IO_default_xsputn_internal 0.02% git git [.] git_checkattr 0.02% git git [.] df_name_compare 0.02% git git [.] write_index 0.02% git git [.] unpack_callback 0.02% git git [.] twoway_merge 0.02% git [vdso] [.] 0x000000ffffe425 0.02% git [kernel] [k] check_for_new_grace_period 0.02% git [kernel] [k] __rcu_read_unlock 0.02% git [kernel] [k] unlock_page 0.02% git [kernel] [k] add_to_page_cache_locked 0.02% git [kernel] [k] release_pages 0.02% git [kernel] [k] unmap_vmas 0.02% git [kernel] [k] find_vma 0.02% git [kernel] [k] kfree 0.02% git [kernel] [k] fd_install 0.02% git [kernel] [k] pipe_read 0.02% git [kernel] [k] do_lookup 0.02% git [kernel] [k] link_path_walk 0.02% git [kernel] [k] dput 0.02% git [kernel] [k] inode_init_always 0.02% git [kernel] [k] find_inode 0.02% git [kernel] [k] __btrfs_cow_block 0.02% git [kernel] [k] btrfs_reduce_alloc_profile 0.02% git [kernel] [k] lookup_inline_extent_backref 0.02% git [kernel] [k] btree_read_extent_buffer_pages 0.02% git [kernel] [k] btrfs_inode_sequence 0.02% git [kernel] [k] free_extent_buffer 0.02% git [kernel] [k] merge_state 0.02% git [kernel] [k] insert_state 0.02% git [kernel] [k] clear_extent_bit 0.02% git [kernel] [k] write_extent_buffer 0.02% git [kernel] [k] btrfs_clear_lock_blocking 0.02% git [kernel] [k] security_inode_alloc 0.02% git [kernel] [k] chksum_update 0.02% git [kernel] [k] generic_make_request 0.02% git [kernel] [k] get_request 0.02% git [kernel] [k] yenta_interrupt 0.02% git [kernel] [k] acpi_pm_read 0.01% git libz.so.1.2.3 [.] .L212 0.01% git libz.so.1.2.3 [.] .L211 0.01% git libc-2.11.so [.] __GI_getenv 0.01% git libc-2.11.so [.] _itoa_word 0.01% git libc-2.11.so [.] __GI_fflush 0.01% git libc-2.11.so [.] __fopen_internal 0.01% git libc-2.11.so [.] __calloc 0.01% git libc-2.11.so [.] __GI_strlen 0.01% git ld-2.11.so [.] _dl_relocate_object 0.01% git git [.] convert_to_working_tree 0.01% git git [.] checkout_entry 0.01% git git [.] add_name_hash 0.01% git git [.] display 0.01% git git [.] verify_path 0.01% git git [.] ce_write 0.01% git git [.] read_index_from 0.01% git git [.] add_entry 0.01% git git [.] git_inflate 0.01% git [kernel] [k] ptregs_execve 0.01% git [kernel] [k] run_timer_softirq 0.01% git [kernel] [k] mod_timer 0.01% git [kernel] [k] wake_up_bit 0.01% git [kernel] [k] prepare_to_wait 0.01% git [kernel] [k] __rcu_read_lock 0.01% git [kernel] [k] rcu_start_gp 0.01% git [kernel] [k] rcu_process_callbacks 0.01% git [kernel] [k] mempool_alloc 0.01% git [kernel] [k] __alloc_pages_nodemask 0.01% git [kernel] [k] free_hot_cold_page 0.01% git [kernel] [k] activate_page 0.01% git [kernel] [k] mark_page_accessed 0.01% git [kernel] [k] ____pagevec_lru_add 0.01% git [kernel] [k] __lru_cache_add 0.01% git [kernel] [k] lru_add_drain 0.01% git [kernel] [k] put_page 0.01% git [kernel] [k] invalidate_mapping_pages 0.01% git [kernel] [k] page_add_new_anon_rmap 0.01% git [kernel] [k] generic_fillattr 0.01% git [kernel] [k] cp_new_stat64 0.01% git [kernel] [k] path_init 0.01% git [kernel] [k] path_put 0.01% git [kernel] [k] path_to_nameidata 0.01% git [kernel] [k] path_walk 0.01% git [kernel] [k] do_unlinkat 0.01% git [kernel] [k] _d_rehash 0.01% git [kernel] [k] d_alloc 0.01% git [kernel] [k] hash 0.01% git [kernel] [k] iput 0.01% git [kernel] [k] inode_init_once 0.01% git [kernel] [k] clear_inode 0.01% git [kernel] [k] ifind 0.01% git [kernel] [k] bio_alloc_bioset 0.01% git [kernel] [k] locks_remove_posix 0.01% git [kernel] [k] dtSearch 0.01% git [kernel] [k] metapage_get_blocks 0.01% git [kernel] [k] check_block 0.01% git [kernel] [k] btrfs_set_path_blocking 0.01% git [kernel] [k] btrfs_alloc_path 0.01% git [kernel] [k] read_block_for_search 0.01% git [kernel] [k] update_ref_for_cow 0.01% git [kernel] [k] read_node_slot 0.01% git [kernel] [k] btrfs_leaf_free_space 0.01% git [kernel] [k] btrfs_insert_empty_items 0.01% git [kernel] [k] pin_down_bytes 0.01% git [kernel] [k] update_block_group 0.01% git [kernel] [k] run_one_delayed_ref 0.01% git [kernel] [k] btrfs_free_extent 0.01% git [kernel] [k] btrfs_find_block_group 0.01% git [kernel] [k] btrfs_lookup_dir_index_item 0.01% git [kernel] [k] btrfs_lookup_inode 0.01% git [kernel] [k] btrfs_find_tree_block 0.01% git [kernel] [k] btrfs_set_buffer_uptodate 0.01% git [kernel] [k] btrfs_find_create_tree_block 0.01% git [kernel] [k] btrfs_buffer_uptodate 0.01% git [kernel] [k] clean_tree_block 0.01% git [kernel] [k] wait_current_trans 0.01% git [kernel] [k] __btrfs_end_transaction 0.01% git [kernel] [k] start_transaction 0.01% git [kernel] [k] btrfs_set_page_dirty 0.01% git [kernel] [k] init_btrfs_i 0.01% git [kernel] [k] btrfs_merge_bio_hook 0.01% git [kernel] [k] btrfs_get_extent 0.01% git [kernel] [k] btrfs_add_link 0.01% git [kernel] [k] btrfs_delete_inode 0.01% git [kernel] [k] btrfs_clear_bit_hook 0.01% git [kernel] [k] lookup_extent_mapping 0.01% git [kernel] [k] btrfs_file_extent_num_bytes 0.01% git [kernel] [k] btrfs_dir_name_len 0.01% git [kernel] [k] btrfs_dir_data_len 0.01% git [kernel] [k] btrfs_key_generation 0.01% git [kernel] [k] btrfs_timespec_nsec 0.01% git [kernel] [k] btrfs_timespec_sec 0.01% git [kernel] [k] btrfs_inode_mode 0.01% git [kernel] [k] btrfs_inode_nbytes 0.01% git [kernel] [k] btrfs_set_item_size 0.01% git [kernel] [k] btrfs_set_item_offset 0.01% git [kernel] [k] btrfs_set_extent_flags 0.01% git [kernel] [k] btrfs_set_timespec_sec 0.01% git [kernel] [k] btrfs_set_inode_block_group 0.01% git [kernel] [k] extent_io_tree_init 0.01% git [kernel] [k] set_page_extent_mapped 0.01% git [kernel] [k] free_extent_state 0.01% git [kernel] [k] split_state 0.01% git [kernel] [k] spin_unlock 0.01% git [kernel] [k] memset_extent_buffer 0.01% git [kernel] [k] memcmp_extent_buffer 0.01% git [kernel] [k] extent_buffer_uptodate 0.01% git [kernel] [k] set_extent_buffer_uptodate 0.01% git [kernel] [k] __btrfs_map_block 0.01% git [kernel] [k] btrfs_map_bio 0.01% git [kernel] [k] bitmap_clear_bits 0.01% git [kernel] [k] btrfs_find_space_for_alloc 0.01% git [kernel] [k] btrfs_find_ref_cluster 0.01% git [kernel] [k] add_delayed_tree_ref 0.01% git [kernel] [k] cap_d_instantiate 0.01% git [kernel] [k] blk_rq_init 0.01% git [kernel] [k] radix_tree_lookup 0.01% git [kernel] [k] rb_insert_color 0.01% git [kernel] [k] rb_prev 0.01% git [kernel] [k] sha_transform 0.01% git [kernel] [k] strncpy_from_user 0.01% git [kernel] [k] copy_to_user 0.01% git [kernel] [k] tty_write 0.01% git [kernel] [k] __scsi_release_buffers 0.01% git [kernel] [k] scsi_io_completion 0.01% git [kernel] [k] ata_sff_interrupt 0.01% git [kernel] [k] mdio_ctrl_hw 0.01% git [kernel] [k] sock_alloc_send_pskb 0.01% git [kernel] [k] tcp_event_data_recv 0.01% git [kernel] [k] __tcp_select_window 0.01% git [kernel] [k] tcp_v4_send_check 0.01% git [kernel] [k] tcp_v4_rcv 0.01% git [kernel] [k] _cond_resched 0.01% git [kernel] [k] mutex_trylock # # (For a higher level overview, try: perf report --sort comm,dso) # --=-=-= -JimC -- James Cloos OpenPGP: 1024D/ED7DAEA6 --=-=-=--