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2011-08-31writeback: show raw dirtied_when in trace writeback_single_inodeWu Fengguang
Save inode->dirtied_when in the raw trace output for reliable scripting, and to also show in formatted output the relative age in seconds for easy human reading. CC: Jan Kara <jack@suse.cz> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-08-19Merge branch 'for-linus' of git://git.kernel.dk/linux-blockLinus Torvalds
* 'for-linus' of git://git.kernel.dk/linux-block: (23 commits) Revert "cfq: Remove special treatment for metadata rqs." block: fix flush machinery for stacking drivers with differring flush flags block: improve rq_affinity placement blktrace: add FLUSH/FUA support Move some REQ flags to the common bio/request area allow blk_flush_policy to return REQ_FSEQ_DATA independent of *FLUSH xen/blkback: Make description more obvious. cfq-iosched: Add documentation about idling block: Make rq_affinity = 1 work as expected block: swim3: fix unterminated of_device_id table block/genhd.c: remove useless cast in diskstats_show() drivers/cdrom/cdrom.c: relax check on dvd manufacturer value drivers/block/drbd/drbd_nl.c: use bitmap_parse instead of __bitmap_parse bsg-lib: add module.h include cfq-iosched: Reduce linked group count upon group destruction blk-throttle: correctly determine sync bio loop: fix deadlock when sysfs and LOOP_CLR_FD race against each other loop: add BLK_DEV_LOOP_MIN_COUNT=%i to allow distros 0 pre-allocated loop devices loop: add management interface for on-demand device allocation loop: replace linked list of allocated devices with an idr index ...
2011-08-11blktrace: add FLUSH/FUA supportNamhyung Kim
Add FLUSH/FUA support to blktrace. As FLUSH precedes WRITE and/or FUA follows WRITE, use the same 'F' flag for both cases and distinguish them by their (relative) position. The end results look like (other flags might be shown also): - WRITE: W - WRITE_FLUSH: FW - WRITE_FUA: WF - WRITE_FLUSH_FUA: FWF Note that we reuse TC_BARRIER due to lack of bit space of act_mask so that the older versions of blktrace tools will report flush requests as barriers from now on. Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: Namhyung Kim <namhyung@gmail.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-08-01Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (60 commits) ext4: prevent memory leaks from ext4_mb_init_backend() on error path ext4: use EXT4_BAD_INO for buddy cache to avoid colliding with valid inode # ext4: use ext4_msg() instead of printk in mballoc ext4: use ext4_kvzalloc()/ext4_kvmalloc() for s_group_desc and s_group_info ext4: introduce ext4_kvmalloc(), ext4_kzalloc(), and ext4_kvfree() ext4: use the correct error exit path in ext4_init_inode_table() ext4: add missing kfree() on error return path in add_new_gdb() ext4: change umode_t in tracepoint headers to be an explicit __u16 ext4: fix races in ext4_sync_parent() ext4: Fix overflow caused by missing cast in ext4_fallocate() ext4: add action of moving index in ext4_ext_rm_idx for Punch Hole ext4: simplify parameters of reserve_backup_gdb() ext4: simplify parameters of add_new_gdb() ext4: remove lock_buffer in bclean() and setup_new_group_blocks() ext4: simplify journal handling in setup_new_group_blocks() ext4: let setup_new_group_blocks() set multiple bits at a time ext4: fix a typo in ext4_group_extend() ext4: let ext4_group_add_blocks() handle 0 blocks quickly ext4: let ext4_group_add_blocks() return an error code ext4: rename ext4_add_groupblocks() to ext4_group_add_blocks() ... Fix up conflict in fs/ext4/inode.c: commit aacfc19c626e ("fs: simplify the blockdev_direct_IO prototype") had changed the ext4_ind_direct_IO() function for the new simplified calling convention, while commit dae1e52cb126 ("ext4: move ext4_ind_* functions from inode.c to indirect.c") moved the function to another file.
2011-07-30ext4: change umode_t in tracepoint headers to be an explicit __u16Theodore Ts'o
As requested by Al Viro, since umode_t may be changing to a u32 for some architectures. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@ZenIV.linux.org.uk>
2011-07-29Merge branch 'upstream/xen-tracing2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen * 'upstream/xen-tracing2' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: xen/tracing: fix compile errors when tracing is disabled.
2011-07-26Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: jbd: change the field "b_cow_tid" of struct journal_head from type unsigned to tid_t ext3.txt: update the links in the section "useful links" to the latest ones ext3: Fix data corruption in inodes with journalled data ext2: check xattr name_len before acquiring xattr_sem in ext2_xattr_get ext3: Fix compilation with -DDX_DEBUG quota: Remove unused declaration jbd: Use WRITE_SYNC in journal checkpoint. jbd: Fix oops in journal_remove_journal_head() ext3: Return -EINVAL when start is beyond the end of fs in ext3_trim_fs() ext3/ioctl.c: silence sparse warnings about different address spaces ext3/ext4 Documentation: remove bh/nobh since it has been deprecated ext3: Improve truncate error handling ext3: use proper little-endian bitops ext2: include fs.h into ext2_fs.h ext3: Fix oops in ext3_try_to_allocate_with_rsv() jbd: fix a bug of leaking jh->b_jcount jbd: remove dependency on __GFP_NOFAIL ext3: Convert ext3 to new truncate calling convention jbd: Add fixed tracepoints ext3: Add fixed tracepoints Resolve conflicts in fs/ext3/fsync.c due to fsync locking push-down and new fixed tracepoints.
2011-07-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback: (27 commits) mm: properly reflect task dirty limits in dirty_exceeded logic writeback: don't busy retry writeback on new/freeing inodes writeback: scale IO chunk size up to half device bandwidth writeback: trace global_dirty_state writeback: introduce max-pause and pass-good dirty limits writeback: introduce smoothed global dirty limit writeback: consolidate variable names in balance_dirty_pages() writeback: show bdi write bandwidth in debugfs writeback: bdi write bandwidth estimation writeback: account per-bdi accumulated written pages writeback: make writeback_control.nr_to_write straight writeback: skip tmpfs early in balance_dirty_pages_ratelimited_nr() writeback: trace event writeback_queue_io writeback: trace event writeback_single_inode writeback: remove .nonblocking and .encountered_congestion writeback: remove writeback_control.more_io writeback: skip balance_dirty_pages() for in-memory fs writeback: add bdi_dirty_limit() kernel-doc writeback: avoid extra sync work at enqueue time writeback: elevate queue_io() into wb_writeback() ... Fix up trivial conflicts in fs/fs-writeback.c and mm/filemap.c
2011-07-25xen/tracing: fix compile errors when tracing is disabled.Jeremy Fitzhardinge
When CONFIG_FUNCTION_TRACER is disabled, compilation fails as follows: CC arch/x86/xen/setup.o In file included from arch/x86/include/asm/xen/hypercall.h:42, from arch/x86/xen/setup.c:19: include/trace/events/xen.h:31: warning: 'struct multicall_entry' declared inside parameter list include/trace/events/xen.h:31: warning: its scope is only this definition or declaration, which is probably not what you want include/trace/events/xen.h:31: warning: 'struct multicall_entry' declared inside parameter list include/trace/events/xen.h:31: warning: 'struct multicall_entry' declared inside parameter list include/trace/events/xen.h:31: warning: 'struct multicall_entry' declared inside parameter list [...] arch/x86/xen/trace.c:5: error: '__HYPERVISOR_set_trap_table' undeclared here (not in a function) arch/x86/xen/trace.c:5: error: array index in initializer not of integer type arch/x86/xen/trace.c:5: error: (near initialization for 'xen_hypercall_names') arch/x86/xen/trace.c:6: error: '__HYPERVISOR_mmu_update' undeclared here (not in a function) arch/x86/xen/trace.c:6: error: array index in initializer not of integer type arch/x86/xen/trace.c:6: error: (near initialization for 'xen_hypercall_names') Fix this by making sure struct multicall_entry has a declaration in scope at all times, and don't bother compiling xen/trace.c when tracing is disabled. Reported-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-24Merge branch 'upstream/xen-tracing2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen * 'upstream/xen-tracing2' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: xen/trace: use class for multicall trace xen/trace: convert mmu events to use DECLARE_EVENT_CLASS()/DEFINE_EVENT() xen/multicall: move *idx fields to start of mc_buffer xen/multicall: special-case singleton hypercalls xen/multicalls: add unlikely around slowpath in __xen_mc_entry() xen/multicalls: disable MC_DEBUG xen/mmu: tune pgtable alloc/release xen/mmu: use extend_args for more mmuext updates xen/trace: add tlb flush tracepoints xen/trace: add segment desc tracing xen/trace: add xen_pgd_(un)pin tracepoints xen/trace: add ptpage alloc/release tracepoints xen/trace: add mmu tracepoints xen/trace: add multicall tracing xen/trace: set up tracepoint skeleton xen/multicalls: remove debugfs stats trace/xen: add skeleton for Xen trace events
2011-07-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (297 commits) ALSA: asihpi - Replace with snd_ctl_boolean_mono_info() ALSA: asihpi - HPI version 4.08 ALSA: asihpi - Add volume mute controls ALSA: asihpi - Control name updates ALSA: asihpi - Use size_t for sizeof result ALSA: asihpi - Explicitly include mutex.h ALSA: asihpi - Add new node and message defines ALSA: asihpi - Make local function static ALSA: asihpi - Fix minor typos and spelling ALSA: asihpi - Remove unused structures, macros and functions ALSA: asihpi - Remove spurious adapter index check ALSA: asihpi - Revise snd_pcm_debug_name, get rid of DEBUG_NAME macro ALSA: asihpi - DSP code loader API now independent of OS ALSA: asihpi - Remove controlex structs and associated special data transfer code ALSA: asihpi - Increase request and response buffer sizes ALSA: asihpi - Give more meaningful name to hpi request message type ALSA: usb-audio - Add quirk for Roland / BOSS BR-800 ALSA: hda - Remove a superfluous argument of via_auto_init_output() ALSA: hda - Fix indep-HP path (de-)activation for VT1708* codecs ALSA: hda - Add documentation for codec-specific mixer controls ...
2011-07-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (107 commits) vfs: use ERR_CAST for err-ptr tossing in lookup_instantiate_filp isofs: Remove global fs lock jffs2: fix IN_DELETE_SELF on overwriting rename() killing a directory fix IN_DELETE_SELF on overwriting rename() on ramfs et.al. mm/truncate.c: fix build for CONFIG_BLOCK not enabled fs:update the NOTE of the file_operations structure Remove dead code in dget_parent() AFS: Fix silly characters in a comment switch d_add_ci() to d_splice_alias() in "found negative" case as well simplify gfs2_lookup() jfs_lookup(): don't bother with . or .. get rid of useless dget_parent() in btrfs rename() and link() get rid of useless dget_parent() in fs/btrfs/ioctl.c fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers drivers: fix up various ->llseek() implementations fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek Ext4: handle SEEK_HOLE/SEEK_DATA generically Btrfs: implement our own ->llseek fs: add SEEK_HOLE and SEEK_DATA flags reiserfs: make reiserfs default to barrier=flush ... Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_super.c due to the new shrinker callout for the inode cache, that clashed with the xfs code to start the periodic workers later.
2011-07-22Merge branch 'topic/asoc' into for-linusTakashi Iwai
2011-07-20vmscan: add shrink_slab tracepointsDave Chinner
It is impossible to understand what the shrinkers are actually doing without instrumenting the code, so add a some tracepoints to allow insight to be gained. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-18xen/trace: use class for multicall traceJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: convert mmu events to use DECLARE_EVENT_CLASS()/DEFINE_EVENT()Jeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add tlb flush tracepointsJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add segment desc tracingJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add xen_pgd_(un)pin tracepointsJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add ptpage alloc/release tracepointsJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add mmu tracepointsJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18xen/trace: add multicall tracingJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-18trace/xen: add skeleton for Xen trace eventsJeremy Fitzhardinge
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2011-07-11ext4: Add new ext4 trim tracepointsTao Ma
Add ext4_trim_extent and ext4_trim_all_free. Reviewed-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-10ext4: add tracepoint for ext4_journal_startTheodore Ts'o
This will help debug who is responsible for starting a jbd2 transaction. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-10jbd2: remove jbd2_dev_to_name() from jbd2 tracepointsTheodore Ts'o
Using function calls in TP_printk causes perf heartburn, so print the MAJOR/MINOR device numbers instead. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-09writeback: trace global_dirty_stateWu Fengguang
Add trace event balance_dirty_state for showing the global dirty page counts and thresholds at each global_dirty_limits() invocation. This will cover the callers throttle_vm_writeout(), over_bground_thresh() and each balance_dirty_pages() loop. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-07-09writeback: make writeback_control.nr_to_write straightWu Fengguang
Pass struct wb_writeback_work all the way down to writeback_sb_inodes(), and initialize the struct writeback_control there. struct writeback_control is basically designed to control writeback of a single file, but we keep abuse it for writing multiple files in writeback_sb_inodes() and its callers. It immediately clean things up, e.g. suddenly wbc.nr_to_write vs work->nr_pages starts to make sense, and instead of saving and restoring pages_skipped in writeback_sb_inodes it can always start with a clean zero value. It also makes a neat IO pattern change: large dirty files are now written in the full 4MB writeback chunk size, rather than whatever remained quota in wbc->nr_to_write. Acked-by: Jan Kara <jack@suse.cz> Proposed-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-07-05Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-05ASoC: core - Add platform IO tracingLiam Girdwood
Trace platform IO just like CODEC IO. Signed-off-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-06-25jbd: Add fixed tracepointsLukas Czerner
This commit adds fixed tracepoint for jbd. It has been based on fixed tracepoints for jbd2, however there are missing those for collecting statistics, since I think that it will require more intrusive patch so I should have its own commit, if someone decide that it is needed. Also there are new tracepoints in __journal_drop_transaction() and journal_update_superblock(). The list of jbd tracepoints: jbd_checkpoint jbd_start_commit jbd_commit_locking jbd_commit_flushing jbd_commit_logging jbd_drop_transaction jbd_end_commit jbd_do_submit_data jbd_cleanup_journal_tail jbd_update_superblock_end Signed-off-by: Lukas Czerner <lczerner@redhat.com> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz>
2011-06-25ext3: Add fixed tracepointsLukas Czerner
This commit adds fixed tracepoints to the ext3 code. It is based on ext4 tracepoints, however due to the differences of both file systems, there are some tracepoints missing (those for delaloc and for multi-block allocator) and there are some ext3 specific as well (for reservation windows). Here is a list: ext3_free_inode ext3_request_inode ext3_allocate_inode ext3_evict_inode ext3_drop_inode ext3_mark_inode_dirty ext3_write_begin ext3_ordered_write_end ext3_writeback_write_end ext3_journalled_write_end ext3_ordered_writepage ext3_writeback_writepage ext3_journalled_writepage ext3_readpage ext3_releasepage ext3_invalidatepage ext3_discard_blocks ext3_request_blocks ext3_allocate_blocks ext3_free_blocks ext3_sync_file_enter ext3_sync_file_exit ext3_sync_fs ext3_rsv_window_add ext3_discard_reservation ext3_alloc_new_reservation ext3_reserved ext3_forget ext3_read_block_bitmap ext3_direct_IO_enter ext3_direct_IO_exit ext3_unlink_enter ext3_unlink_exit ext3_truncate_enter ext3_truncate_exit ext3_get_blocks_enter ext3_get_blocks_exit ext3_load_inode Signed-off-by: Lukas Czerner <lczerner@redhat.com> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz>
2011-06-21core: add tracepoints for queueing skb to rcvbufSatoru Moriya
This patch adds 2 tracepoints to get a status of a socket receive queue and related parameter. One tracepoint is added to sock_queue_rcv_skb. It records rcvbuf size and its usage. The other tracepoint is added to __sk_mem_schedule and it records limitations of memory for sockets and current usage. By using these tracepoints we're able to know detailed reason why kernel drop the packet. Signed-off-by: Satoru Moriya <satoru.moriya@hds.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-21udp: add tracepoints for queueing skb to rcvbufSatoru Moriya
This patch adds a tracepoint to __udp_queue_rcv_skb to get the return value of ip_queue_rcv_skb. It indicates why kernel drops a packet at this point. ip_queue_rcv_skb returns following values in the packet drop case: rcvbuf is full : -ENOMEM sk_filter returns error : -EINVAL, -EACCESS, -ENOMEM, etc. __sk_mem_schedule returns error: -ENOBUF Signed-off-by: Satoru Moriya <satoru.moriya@hds.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-21Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: jbd2: Fix oops in jbd2_journal_remove_journal_head() jbd2: Remove obsolete parameters in the comments for some jbd2 functions ext4: fixed tracepoints cleanup ext4: use FIEMAP_EXTENT_LAST flag for last extent in fiemap ext4: Fix max file size and logical block counting of extent format file ext4: correct comments for ext4_free_blocks()
2011-06-19Merge branch 'core-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rcu: Move RCU_BOOST #ifdefs to header file rcu: use softirq instead of kthreads except when RCU_BOOST=y rcu: Use softirq to address performance regression rcu: Simplify curing of load woes
2011-06-15vmscan: implement swap token priority agingKOSAKI Motohiro
While testing for memcg aware swap token, I observed a swap token was often grabbed an intermittent running process (eg init, auditd) and they never release a token. Why? Some processes (eg init, auditd, audispd) wake up when a process exiting. And swap token can be get first page-in process when a process exiting makes no swap token owner. Thus such above intermittent running process often get a token. And currently, swap token priority is only decreased at page fault path. Then, if the process sleep immediately after to grab swap token, the swap token priority never be decreased. That's obviously undesirable. This patch implement very poor (and lightweight) priority aging. It only be affect to the above corner case and doesn't change swap tendency workload performance (eg multi process qsbench load) Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-06-15vmscan: implement swap token traceKOSAKI Motohiro
This is useful for observing swap token activity. example output: zsh-1845 [000] 598.962716: update_swap_token_priority: mm=ffff88015eaf7700 old_prio=1 new_prio=0 memtoy-1830 [001] 602.033900: update_swap_token_priority: mm=ffff880037a45880 old_prio=947 new_prio=949 memtoy-1830 [000] 602.041509: update_swap_token_priority: mm=ffff880037a45880 old_prio=949 new_prio=951 memtoy-1830 [000] 602.051959: update_swap_token_priority: mm=ffff880037a45880 old_prio=951 new_prio=953 memtoy-1830 [000] 602.052188: update_swap_token_priority: mm=ffff880037a45880 old_prio=953 new_prio=955 memtoy-1830 [001] 602.427184: put_swap_token: token_mm=ffff880037a45880 zsh-1789 [000] 602.427281: replace_swap_token: old_token_mm= (null) old_prio=0 new_token_mm=ffff88015eaf7018 new_prio=2 zsh-1789 [001] 602.433456: update_swap_token_priority: mm=ffff88015eaf7018 old_prio=2 new_prio=4 zsh-1789 [000] 602.437613: update_swap_token_priority: mm=ffff88015eaf7018 old_prio=4 new_prio=6 zsh-1789 [000] 602.443924: update_swap_token_priority: mm=ffff88015eaf7018 old_prio=6 new_prio=8 zsh-1789 [000] 602.451873: update_swap_token_priority: mm=ffff88015eaf7018 old_prio=8 new_prio=10 zsh-1789 [001] 602.462639: update_swap_token_priority: mm=ffff88015eaf7018 old_prio=10 new_prio=12 Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Rik van Riel<riel@redhat.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-06-14rcu: Use softirq to address performance regressionShaohua Li
Commit a26ac2455ffcf3(rcu: move TREE_RCU from softirq to kthread) introduced performance regression. In an AIM7 test, this commit degraded performance by about 40%. The commit runs rcu callbacks in a kthread instead of softirq. We observed high rate of context switch which is caused by this. Out test system has 64 CPUs and HZ is 1000, so we saw more than 64k context switch per second which is caused by RCU's per-CPU kthread. A trace showed that most of the time the RCU per-CPU kthread doesn't actually handle any callbacks, but instead just does a very small amount of work handling grace periods. This means that RCU's per-CPU kthreads are making the scheduler do quite a bit of work in order to allow a very small amount of RCU-related processing to be done. Alex Shi's analysis determined that this slowdown is due to lock contention within the scheduler. Unfortunately, as Peter Zijlstra points out, the scheduler's real-time semantics require global action, which means that this contention is inherent in real-time scheduling. (Yes, perhaps someone will come up with a workaround -- otherwise, -rt is not going to do well on large SMP systems -- but this patch will work around this issue in the meantime. And "the meantime" might well be forever.) This patch therefore re-introduces softirq processing to RCU, but only for core RCU work. RCU callbacks are still executed in kthread context, so that only a small amount of RCU work runs in softirq context in the common case. This should minimize ksoftirqd execution, allowing us to skip boosting of ksoftirqd for CONFIG_RCU_BOOST=y kernels. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Tested-by: "Alex,Shi" <alex.shi@intel.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2011-06-08writeback: trace event writeback_queue_ioWu Fengguang
Note that it adds a little overheads to account the moved/enqueued inodes from b_dirty to b_io. The "moved" accounting may be later used to limit the number of inodes that can be moved in one shot, in order to keep spinlock hold time under control. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-06-08writeback: trace event writeback_single_inodeWu Fengguang
It is valuable to know how the dirty inodes are iterated and their IO size. "writeback_single_inode: bdi 8:0: ino=134246746 state=I_DIRTY_SYNC|I_SYNC age=414 index=0 to_write=1024 wrote=0" - "state" reflects inode->i_state at the end of writeback_single_inode() - "index" reflects mapping->writeback_index after the ->writepages() call - "to_write" is the wbc->nr_to_write at entrance of writeback_single_inode() - "wrote" is the number of pages actually written v2: add trace event writeback_single_inode_requeue as proposed by Dave. CC: Dave Chinner <david@fromorbit.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-06-08writeback: remove .nonblocking and .encountered_congestionWu Fengguang
Remove two unused struct writeback_control fields: .encountered_congestion (completely unused) .nonblocking (never set, checked/showed in XFS,NFS/btrfs) The .for_background check in nfs_write_inode() is also removed btw, as .for_background implies WB_SYNC_NONE. Reviewed-by: Jan Kara <jack@suse.cz> Proposed-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-06-08writeback: remove writeback_control.more_ioWu Fengguang
When wbc.more_io was first introduced, it indicates whether there are at least one superblock whose s_more_io contains more IO work. Now with the per-bdi writeback, it can be replaced with a simple b_more_io test. Acked-by: Jan Kara <jack@suse.cz> Acked-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
2011-06-06ext4: fixed tracepoints cleanupLukas Czerner
While creating fixed tracepoints for ext3, basically by porting them from ext4, I found a lot of useless retyping, wrong type usage, useless variable passing and other inconsistencies in the ext4 fixed tracepoint code. This patch cleans the fixed tracepoint code for ext4 and also simplify some of them. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-06-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (40 commits) tg3: Fix tg3_skb_error_unmap() net: tracepoint of net_dev_xmit sees freed skb and causes panic drivers/net/can/flexcan.c: add missing clk_put net: dm9000: Get the chip in a known good state before enabling interrupts drivers/net/davinci_emac.c: add missing clk_put af-packet: Add flag to distinguish VID 0 from no-vlan. caif: Fix race when conditionally taking rtnl lock usbnet/cdc_ncm: add missing .reset_resume hook vlan: fix typo in vlan_dev_hard_start_xmit() net/ipv4: Check for mistakenly passed in non-IPv4 address iwl4965: correctly validate temperature value bluetooth l2cap: fix locking in l2cap_global_chan_by_psm ath9k: fix two more bugs in tx power cfg80211: don't drop p2p probe responses Revert "net: fix section mismatches" drivers/net/usb/catc.c: Fix potential deadlock in catc_ctrl_run() sctp: stop pending timers and purge queues when peer restart asoc drivers/net: ks8842 Fix crash on received packet when in PIO mode. ip_options_compile: properly handle unaligned pointer iwlagn: fix incorrect PCI subsystem id for 6150 devices ...
2011-06-02net: tracepoint of net_dev_xmit sees freed skb and causes panicKoki Sanagi
Because there is a possibility that skb is kfree_skb()ed and zero cleared after ndo_start_xmit, we should not see the contents of skb like skb->len and skb->dev->name after ndo_start_xmit. But trace_net_dev_xmit does that and causes panic by NULL pointer dereference. This patch fixes trace_net_dev_xmit not to see the contents of skb directly. If you want to reproduce this panic, 1. Get tracepoint of net_dev_xmit on 2. Create 2 guests on KVM 2. Make 2 guests use virtio_net 4. Execute netperf from one to another for a long time as a network burden 5. host will panic(It takes about 30 minutes) Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-28Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (25 commits) perf: Fix SIGIO handling perf top: Don't stop if no kernel symtab is found perf top: Handle kptr_restrict perf top: Remove unused macro perf events: initialize fd array to -1 instead of 0 perf tools: Make sure kptr_restrict warnings fit 80 col terms perf tools: Fix build on older systems perf symbols: Handle /proc/sys/kernel/kptr_restrict perf: Remove duplicate headers ftrace: Add internal recursive checks tracing: Update btrfs's tracepoints to use u64 interface tracing: Add __print_symbolic_u64 to avoid warnings on 32bit machine ftrace: Set ops->flag to enabled even on static function tracing tracing: Have event with function tracer check error return ftrace: Have ftrace_startup() return failure code jump_label: Check entries limit in __jump_label_update ftrace/recordmcount: Avoid STT_FUNC symbols as base on ARM scripts/tags.sh: Add magic for trace-events for etags too scripts/tags.sh: Fix ctags for DEFINE_EVENT() x86/ftrace: Fix compiler warning in ftrace.c ...
2011-05-26Merge branch 'gpio/next' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds
* 'gpio/next' of git://git.secretlab.ca/git/linux-2.6: gpio/via: rename VIA local config struct basic_mmio_gpio: split into a gpio library and platform device gpio: remove some legacy comments in build files gpio: add trace events for setting direction and value gpio/pca953x: Use handle_simple_irq instead of handle_edge_irq gpiolib: export gpiochip_find gpio: remove redundant Kconfig depends on GPIOLIB basic_mmio_gpio: convert to non-__raw* accessors basic_mmio_gpio: support direction registers basic_mmio_gpio: support different input/output registers basic_mmio_gpio: detect output method at probe time basic_mmio_gpio: request register regions basic_mmio_gpio: allow overriding number of gpio basic_mmio_gpio: convert to platform_{get,set}_drvdata() basic_mmio_gpio: remove runtime width/endianness evaluation
2011-05-25tracing: Update btrfs's tracepoints to use u64 interfaceliubo
To avoid 64->32 truncating WARNING, update btrfs's tracepoints. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Link: http://lkml.kernel.org/r/4DACE6E3.8080200@cn.fujitsu.com Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-05-25tracing: Add __print_symbolic_u64 to avoid warnings on 32bit machineliubo
Filesystem, like Btrfs, has some "ULL" macros, and when these macros are passed to tracepoints'__print_symbolic(), there will be 64->32 truncate WARNINGS during compiling on 32bit box. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Link: http://lkml.kernel.org/r/4DACE6E0.7000507@cn.fujitsu.com Signed-off-by: Steven Rostedt <rostedt@goodmis.org>