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2009-09-23rcu: Clean up code based on review feedback from Josh Triplett, part 2Paul E. McKenney
These issues identified during an old-fashioned face-to-face code review extending over many hours. o Add comments for tricky parts of code, and correct comments that have passed their sell-by date. o Get rid of the vestiges of rcu_init_sched(), which is no longer needed now that PREEMPT_RCU is gone. o Move the #include of rcutree_plugin.h to the end of rcutree.c, which means that, rather than having a random collection of forward declarations, the new set of forward declarations document the set of plugins. The new home for this #include also allows __rcu_init_preempt() to move into rcutree_plugin.h. o Fix rcu_preempt_check_callbacks() to be static. Suggested-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12537246443924-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu> Peter Zijlstra <peterz@infradead.org>
2009-09-23rcu: Clean up code based on review feedback from Josh TriplettPaul E. McKenney
These issues identified during an old-fashioned face-to-face code review extended over many hours. o Bury various forms of the "rsp->completed == rsp->gpnum" comparison into an rcu_gp_in_progress() function, which has the beneficial side-effect of forcing consistent use of ACCESS_ONCE(). o Replace hand-coded arithmetic with DIV_ROUND_UP(). o Bury several "!list_empty(&rnp->blocked_tasks[rnp->gpnum & 0x01])" instances into an rcu_preempted_readers() function, as this expression indicates that there are no readers blocked within RCU read-side critical sections blocking the current grace period. (Though there might well be similar readers blocking the next grace period.) o Remove a dangling rcu_restart_cpu() declaration that has been dangling for almost 20 minor releases of the kernel. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12537246442687-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22futex: Fix wakeup race by setting TASK_INTERRUPTIBLE before queue_me()Darren Hart
PI futexes do not use the same plist_node_empty() test for wakeup. It was possible for the waiter (in futex_wait_requeue_pi()) to set TASK_INTERRUPTIBLE after the waker assigned the rtmutex to the waiter. The waiter would then note the plist was not empty and call schedule(). The task would not be found by any subsequeuent futex wakeups, resulting in a userspace hang. By moving the setting of TASK_INTERRUPTIBLE to before the call to queue_me(), the race with the waker is eliminated. Since we no longer call get_user() from within queue_me(), there is no need to delay the setting of TASK_INTERRUPTIBLE until after the call to queue_me(). The FUTEX_LOCK_PI operation is not affected as futex_lock_pi() relies entirely on the rtmutex code to handle schedule() and wakeup. The requeue PI code is affected because the waiter starts as a non-PI waiter and is woken on a PI futex. Remove the crusty old comment about holding spinlocks() across get_user() as we no longer do that. Correct the locking statement with a description of why the test is performed. Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20090922053038.8717.97838.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22futex: Correct futex_q woken state commentaryDarren Hart
Use kernel-doc format to describe struct futex_q. Correct the wakeup definition to eliminate the statement about waking the waiter between the plist_del() and the q->lock_ptr = 0. Note in the comment that PI futexes have a different definition of the woken state. Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20090922053029.8717.62798.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22futex: Make function kernel-doc commentary consistentDarren Hart
Make the existing function kernel-doc consistent throughout futex.c, following Documentation/kernel-doc-nano-howto.txt as closely as possible. When unsure, at least be consistent within futex.c. Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20090922053022.8717.13339.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22futex: Correct queue_me and unqueue_me commentaryDarren Hart
The queue_me/unqueue_me commentary is oddly placed and out of date. Clean it up and correct the inaccurate bits. Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20090922053015.8717.71713.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22futex: Correct futex_wait_requeue_pi() commentaryDarren Hart
Correct various typos and formatting inconsistencies in the commentary of futex_wait_requeue_pi(). Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20090922052958.8717.21932.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-21Merge branch 'core-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rcu: Fix whitespace inconsistencies rcu: Fix thinko, actually initialize full tree rcu: Apply results of code inspection of kernel/rcutree_plugin.h rcu: Add WARN_ON_ONCE() consistency checks covering state transitions rcu: Fix synchronize_rcu() for TREE_PREEMPT_RCU rcu: Simplify rcu_read_unlock_special() quiescent-state accounting rcu: Add debug checks to TREE_PREEMPT_RCU for premature grace periods rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down rcutorture: Occasionally delay readers enough to make RCU force_quiescent_state rcu: Initialize multi-level RCU grace periods holding locks rcu: Need to update rnp->gpnum if preemptable RCU is to be reliable
2009-09-21Merge branch 'sched-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: Simplify sys_sched_rr_get_interval() system call sched: Fix potential NULL derference of doms_cur sched: Fix raciness in runqueue_is_locked() sched: Re-add lost cpu_allowed check to sched_fair.c::select_task_rq_fair() sched: Remove unneeded indentation in sched_fair.c::place_entity()
2009-09-21Merge branch 'tracing-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_file tracing: Export trace_profile_buf symbols tracing/events: use list_for_entry_continue tracing: remove max_tracer_type_len function-graph: use ftrace_graph_funcs directly tracing: Remove markers tracing: Allocate the ftrace event profile buffer dynamically tracing: Factorize the events profile accounting
2009-09-21sched: Simplify sys_sched_rr_get_interval() system callPeter Williams
By removing the need for it to know details of scheduling classes. This allows PlugSched to define orthogonal scheduling classes. Signed-off-by: Peter Williams <pwil3058@bigpond.net.au> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <06d1b89ee15a0eef82d7.1253496713@mudlark.pw.nest> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6: includecheck fix: x86, cpu/common.c includecheck fix: kernel/trace, ring_buffer.c includecheck fix: include/linux, ftrace.h includecheck fix: include/linux, page_cgroup.h includecheck fix: include/linux, aio.h includecheck fix: include/drm, drm_memory.h includecheck fix: include/acpi, acpi_bus.h includecheck fix: drivers/xen, evtchn.c includecheck fix: drivers/video, vgacon.c includecheck fix: drivers/scsi, ibmvscsi.c includecheck fix: drivers/scsi, libfcoe.c includecheck fix: x86, shadow.c includecheck fix: x86, traps.c includecheck fix: um, helper.c includecheck fix: s390, sys_s390.c
2009-09-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (79 commits) USB serial: update the console driver usb-serial: straighten out serial_open usb-serial: add missing tests and debug lines usb-serial: rename subroutines usb-serial: fix termios initialization logic usb-serial: acquire references when a new tty is installed usb-serial: change logic of serial lookups usb-serial: put subroutines in logical order usb-serial: change referencing of port and serial structures tty: Char: mxser, use THRE for ASPP_OQUEUE ioctl tty: Char: mxser, add support for CP112UL uartlite: support shared interrupt lines tty: USB: serial/mct_u232, fix tty refcnt tty: riscom8, fix tty refcnt tty: riscom8, fix shutdown declaration TTY: fix typos tty: Power: fix suspend vt regression tty: vt: use printk_once tty: handle VT specific compat ioctls in vt driver n_tty: move echoctl check and clean up logic ...
2009-09-20Merge branch 'perfcounters-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perfcounters-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (58 commits) perf_counter: Fix perf_copy_attr() pointer arithmetic perf utils: Use a define for the maximum length of a trace event perf: Add timechart help text and add timechart to "perf help" tracing, x86, cpuidle: Move the end point of a C state in the power tracer perf utils: Be consistent about minimum text size in the svghelper perf timechart: Add "perf timechart record" perf: Add the timechart tool perf: Add a SVG helper library file tracing, perf: Convert the power tracer into an event tracer perf: Add a sample_event type to the event_union perf: Allow perf utilities to have "callback" options without arguments perf: Store trace event name/id pairs in perf.data perf: Add a timestamp to fork events sched_clock: Make it NMI safe perf_counter: Fix up swcounter throttling x86, perf_counter, bts: Optimize BTS overflow handling perf sched: Add --input=file option to builtin-sched.c perf trace: Sample timestamp and cpu when using record flag perf tools: Increase MAX_EVENT_LENGTH perf tools: Fix memory leak in read_ftrace_printk() ...
2009-09-20sched: Fix potential NULL derference of doms_curYong Zhang
If CONFIG_CPUMASK_OFFSTACK is enabled but doms_cur alloc failed in arch_init_sched_domains(), doms_cur will move back to fallback_doms. But this time, fallback_doms has not been initialized yet. Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Cc: a.p.zijlstra@chello.nl LKML-Reference: <1252930816-7672-1-git-send-email-yong.zhang0@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20kernel/profile.c: Switch /proc/irq/prof_cpu_mask to seq_fileAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20sched: Fix raciness in runqueue_is_locked()Andrew Morton
runqueue_is_locked() is unavoidably racy due to a poor interface design. It does cpu = get_cpu() ret = some_perpcu_thing(cpu); put_cpu(cpu); return ret; Its return value is unreliable. Fix. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <200909191855.n8JItiko022148@imap1.linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20tracing: Export trace_profile_buf symbolsPeter Zijlstra
ERROR: "trace_profile_buf_nmi" [fs/jbd2/jbd2.ko] undefined! ERROR: "trace_profile_buf" [fs/jbd2/jbd2.ko] undefined! ERROR: "trace_profile_buf_nmi" [fs/ext4/ext4.ko] undefined! ERROR: "trace_profile_buf" [fs/ext4/ext4.ko] undefined! ERROR: "trace_profile_buf_nmi" [arch/x86/kvm/kvm.ko] undefined! ERROR: "trace_profile_buf" [arch/x86/kvm/kvm.ko] undefined! Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1253442878.7542.3.camel@laptop> [ fixed whitespace noise and checkpatch complaint ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20includecheck fix: kernel/trace, ring_buffer.cJaswinder Singh Rajput
fix the following 'make includecheck' warning: kernel/trace/ring_buffer.c: trace.h is included more than once. Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Sam Ravnborg <sam@ravnborg.org> LKML-Reference: <1247068617.4382.107.camel@ht.satnam>
2009-09-19vt: remove power stuff from kernel/powerAlan Cox
In the past someone gratuitiously borrowed chunks of kernel internal vt code and dumped them in kernel/power. They have all sorts of deep relations with the vt code so put them in the vt tree instead Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-19kfifo: Use "const" definitionsAlan Cox
Currently kfifo cannot be used by parts of the kernel that use "const" properly as kfifo itself does not use const for passed data blocks which are indeed const. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-19perf_counter: Fix perf_copy_attr() pointer arithmeticIan Schram
There is still some weird code in per_copy_attr(). Which supposedly checks that all bytes trailing a struct are zero. It doesn't seem to get pointer arithmetic right. Since it increments an iterating pointer by sizeof(unsigned long) rather than 1. Signed-off-by: Ian Schram <ischram@telenet.be> [ v2: clean up the messy PTR_ALIGN logic as well. ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: <stable@kernel.org> # for v2.6.31.x LKML-Reference: <4AB3DEE2.3030600@telenet.be> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19Merge branch 'tip/tracing/core' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent
2009-09-19tracing/events: use list_for_entry_continueLi Zefan
Simplify s_next() and t_next(). Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AB32389.1030005@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-19tracing: remove max_tracer_type_lenLi Zefan
Limit the length of a tracer's name within 100 chars, and then we don't have to play with max_tracer_type_len. Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AB32377.9020601@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-19function-graph: use ftrace_graph_funcs directlyLi Zefan
No need to store ftrace_graph_funcs in file->private. Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AB32364.7020602@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-19sched: Re-add lost cpu_allowed check to sched_fair.c::select_task_rq_fair()Mike Galbraith
While doing some testing, I pinned mplayer, only to find it following X around like a puppy. Looking at commit c88d591, I found a cpu_allowed check that went AWOL. I plugged it back in where it looks like it needs to go, and now when I say "sit, stay!", mplayer obeys again. 'c88d591 sched: Merge select_task_rq_fair() and sched_balance_self()' accidentally dropped the check, causing wake_affine() to pull pinned tasks - put it back. [ v2: use a cheaper version from Peter ] Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19Merge branch 'tracing/core-v3' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/urgent
2009-09-19tracing, perf: Convert the power tracer into an event tracerArjan van de Ven
This patch converts the existing power tracer into an event tracer, so that power events (C states and frequency changes) can be tracked via "perf". This also removes the perl script that was used to demo the tracer; its functionality is being replaced entirely with timechart. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090912130542.6d314860@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19perf: Add a timestamp to fork eventsArjan van de Ven
perf timechart needs to know when a process forked, in order to be able to visualize properly when tasks start. This patch adds a time field to the event structure, and fills it in appropriately. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090912130341.51ad2de2@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19Merge branch 'linus' into perfcounters/coreIngo Molnar
Merge reason: Bring in tracing changes we depend on. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19rcu: Fix whitespace inconsistenciesPaul E. McKenney
Fix a number of whitespace ^Ierrors in the include/linux/rcu* and the kernel/rcu* files. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <20090918172819.GA24405@linux.vnet.ibm.com> [ did more checkpatch fixlets ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19rcu: Fix thinko, actually initialize full treePaul E. McKenney
Commit de078d8 ("rcu: Need to update rnp->gpnum if preemptable RCU is to be reliable") repeatedly and incorrectly initializes the root rcu_node structure's ->gpnum field rather than initializing the ->gpnum field of each node in the tree. Fix this. Also add an additional consistency check to catch this in the future. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <125329262011-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19rcu: Apply results of code inspection of kernel/rcutree_plugin.hPaul E. McKenney
o Drop the calls to cpu_quiet() from the online/offline code. These are unnecessary, since force_quiescent_state() will clean up, and removing them simplifies the code a bit. o Add a warning to check that we don't enqueue the same blocked task twice onto the ->blocked_tasks[] lists. o Rework the phase computation in rcu_preempt_note_context_switch() to be more readable, as suggested by Josh Triplett. o Disable irqs to close a race between the scheduling clock interrupt and rcu_preempt_note_context_switch() WRT the ->rcu_read_unlock_special field. o Add comments to rnp->lock acquisition and release within rcu_read_unlock_special() noting that irqs are already disabled. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <12532926201851-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19rcu: Add WARN_ON_ONCE() consistency checks covering state transitionsPaul E. McKenney
o Verify that qsmask bits stay clear through GP initialization. o Verify that cpu_quiet_msk_finish() is never invoked unless there actually is an RCU grace period in progress. o Verify that all internal-node rcu_node structures have empty blocked_tasks[] lists. o Verify that child rcu_node structure's bits remain clear after acquiring parent's lock. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <12532926191947-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18tracing: Remove markersChristoph Hellwig
Now that the last users of markers have migrated to the event tracer we can kill off the (now orphan) support code. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090917173527.GA1699@lst.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18sched_clock: Make it NMI safePeter Zijlstra
Arjan complained about the suckyness of TSC on modern machines, and asked if we could do something about that for PERF_SAMPLE_TIME. Make cpu_clock() NMI safe by removing the spinlock and using cmpxchg. This also makes it smaller and more robust. Affects architectures that use HAVE_UNSTABLE_SCHED_CLOCK, i.e. IA64 and x86. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18perf_counter: Fix up swcounter throttlingPeter Zijlstra
/me dons the brown paper bag. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18x86, perf_counter, bts: Optimize BTS overflow handlingMarkus Metzger
Draining the BTS buffer on a buffer overflow interrupt takes too long resulting in a kernel lockup when tracing the kernel. Restructure perf_counter sampling into sample creation and sample output. Prepare a single reference sample for BTS sampling and update the from and to address fields when draining the BTS buffer. Drain the entire BTS buffer between a single perf_output_begin() / perf_output_end() pair. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090915130023.A16204@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18headers: taskstats_kern.h trimAlexey Dobriyan
Remove net/genetlink.h inclusion, now sched.c won't be recompiled because of some networking changes. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-18Merge branch 'timers-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (34 commits) time: Prevent 32 bit overflow with set_normalized_timespec() clocksource: Delay clocksource down rating to late boot clocksource: clocksource_select must be called with mutex locked clocksource: Resolve cpu hotplug dead lock with TSC unstable, fix crash timers: Drop a function prototype clocksource: Resolve cpu hotplug dead lock with TSC unstable timer.c: Fix S/390 comments timekeeping: Fix invalid getboottime() value timekeeping: Fix up read_persistent_clock() breakage on sh timekeeping: Increase granularity of read_persistent_clock(), build fix time: Introduce CLOCK_REALTIME_COARSE x86: Do not unregister PIT clocksource on PIT oneshot setup/shutdown clocksource: Avoid clocksource watchdog circular locking dependency clocksource: Protect the watchdog rating changes with clocksource_mutex clocksource: Call clocksource_change_rating() outside of watchdog_lock timekeeping: Introduce read_boot_clock timekeeping: Increase granularity of read_persistent_clock() timekeeping: Update clocksource with stop_machine timekeeping: Add timekeeper read_clock helper functions timekeeping: Move NTP adjusted clock multiplier to struct timekeeper ... Fix trivial conflict due to MIPS lemote -> loongson renaming.
2009-09-18sched: Remove unneeded indentation in sched_fair.c::place_entity()Mike Galbraith
Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1253258365.22787.33.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18tracing: Allocate the ftrace event profile buffer dynamicallyFrederic Weisbecker
Currently the trace event profile buffer is allocated in the stack. But this may be too much for the stack, as the events can have large statically defined field size and can also grow with dynamic arrays. Allocate two per cpu buffer for all profiled events. The first cpu buffer is used to host every non-nmi context traces. It is protected by disabling the interrupts while writing and committing the trace. The second buffer is reserved for nmi. So that there is no race between them and the first buffer. The whole write/commit section is rcu protected because we release these buffers while deactivating the last profiling trace event. v2: Move the buffers from trace_event to be global, as pointed by Steven Rostedt. v3: Fix the syscall events to handle the profiling buffer races by disabling interrupts, now that the buffers are globals. Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ingo Molnar <mingo@elte.hu>
2009-09-18tracing: Factorize the events profile accountingFrederic Weisbecker
Factorize the events enabling accounting in a common tracing core helper. This reduces the size of the profile_enable() and profile_disable() callbacks for each trace events. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ingo Molnar <mingo@elte.hu>
2009-09-17Merge branch 'sched-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (37 commits) sched: Fix SD_POWERSAVING_BALANCE|SD_PREFER_LOCAL vs SD_WAKE_AFFINE sched: Stop buddies from hogging the system sched: Add new wakeup preemption mode: WAKEUP_RUNNING sched: Fix TASK_WAKING & loadaverage breakage sched: Disable wakeup balancing sched: Rename flags to wake_flags sched: Clean up the load_idx selection in select_task_rq_fair sched: Optimize cgroup vs wakeup a bit sched: x86: Name old_perf in a unique way sched: Implement a gentler fair-sleepers feature sched: Add SD_PREFER_LOCAL sched: Add a few SYNC hint knobs to play with sched: Fix sync wakeups again sched: Add WF_FORK sched: Rename sync arguments sched: Rename select_task_rq() argument sched: Feature to disable APERF/MPERF cpu_power x86: sched: Provide arch implementations using aperf/mperf x86: Add generic aperf/mperf code x86: Move APERF/MPERF into a X86_FEATURE ... Fix up trivial conflict in arch/x86/include/asm/processor.h due to nearby addition of amd_get_nb_id() declaration from the EDAC merge.
2009-09-18rcu: Fix synchronize_rcu() for TREE_PREEMPT_RCUPaul E. McKenney
The redirection of synchronize_sched() to synchronize_rcu() was appropriate for TREE_RCU, but not for TREE_PREEMPT_RCU. Fix this by creating an underlying synchronize_sched(). TREE_RCU then redirects synchronize_rcu() to synchronize_sched(), while TREE_PREEMPT_RCU has its own version of synchronize_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <12528585111916-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18rcu: Simplify rcu_read_unlock_special() quiescent-state accountingPaul E. McKenney
The earlier approach required two scheduling-clock ticks to note an preemptable-RCU quiescent state in the situation in which the scheduling-clock interrupt is unlucky enough to always interrupt an RCU read-side critical section. With this change, the quiescent state is instead noted by the outermost rcu_read_unlock() immediately following the first scheduling-clock tick, or, alternatively, by the first subsequent context switch. Therefore, this change also speeds up grace periods. Suggested-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <12528585111945-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18rcu: Add debug checks to TREE_PREEMPT_RCU for premature grace periodsPaul E. McKenney
Check to make sure that there are no blocked tasks for the previous grace period while initializing for the next grace period, verify that rcu_preempt_qs() is given the correct CPU number and is never called for an offline CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu LKML-Reference: <12528585111986-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18rcutorture: Occasionally delay readers enough to make RCU force_quiescent_stateJosh Triplett
rcutorture already delays readers, but never for long enough to make RCU force a quiescent state. Add an occasional delay of 50ms. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josht@linux.vnet.ibm.com Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org LKML-Reference: <12524504772607-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-18rcu: Initialize multi-level RCU grace periods holding locksPaul E. McKenney
Prior implementations initialized the root and any internal nodes without holding locks, then initialized the leaves holding locks. This is a false economy, as the leaf nodes will usually greatly outnumber the root and internal nodes. Acquiring locks on all nodes is conceptually much simpler as well. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josht@linux.vnet.ibm.com Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org LKML-Reference: <12524504773190-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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