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* make acct_kill() wait for file closing.Al Viro2014-08-07
| | | | | | | Do actual closing of file via schedule_work(). And use __fput_sync() there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* drop ->s_umount around acct_auto_close()Al Viro2014-08-07
| | | | | | | | | | just repeat the frozen check after regaining it, and check that sb is still alive. If several threads hit acct_auto_close() at the same time, acct_auto_close() will survive that just fine. And we really don't want to play with writes and closing the file with ->s_umount held exclusive - it's a deadlock country. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: get rid of acct_lock for acct->countAl Viro2014-08-07
| | | | | | | | | * make acct->count atomic and acct freeing - rcu-delayed. * instead of grabbing acct_lock around the places where we take a reference, do that under rcu_read_lock() with atomic_long_inc_not_zero(). * have the new acct locked before making ns->bacct point to it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: get rid of acct_listAl Viro2014-08-07
| | | | | | | | Put these suckers on per-vfsmount and per-superblock lists instead. Note: right now it's still acct_lock for everything, but that's going to change. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: simplify check_free_space()Al Viro2014-08-07
| | | | | | | | | a) file can't be NULL b) file can't be changed under us c) all writes are serialized by acct->lock; no need to mess with spinlock there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: new lifetime rulesAl Viro2014-08-07
| | | | | | | | | | | | | | | | | | | | Do not reuse bsd_acct_struct after closing the damn thing. Structure lifetime is controlled by refcount now. We also have a mutex in there, held over closing and writing (the file is O_APPEND, so we are not losing any concurrency). As the result, we do not need to bother with get_file()/fput() on log write anymore. Moreover, do_acct_process() only needs acct itself; file and pidns are picked from it. Killed instances are distinguished by having NULL ->ns. Refcount is protected by acct_lock; anybody taking the mutex needs to grab a reference first. The things will get a lot simpler in the next commits - this is just the minimal chunk switching to the new lifetime rules. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: serialize acct_on()Al Viro2014-08-07
| | | | | | brute-force - on a global mutex that isn't nested into anything. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct() should honour the limits from the very beginningAl Viro2014-08-07
| | | | | | We need to check free space on the first write to freshly opened log. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* split the slow path in acct_process() offAl Viro2014-08-07
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* separate namespace-independent parts of filling acct_tAl Viro2014-08-07
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: switch to __kernel_write()Al Viro2014-08-07
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* acct: encode_comp_t(0) is 0, fortunately...Al Viro2014-08-07
| | | | | | | | | | | | | | | | | | | | | | There was an amusing bogosity in ac_rw calculation - it tried to do encode_comp_t(encode_comp_t(0) / 1024). Seeing that comp_t is a 3-bit exponent + 13-bit mantissa... it's a good thing that 0 is represented by all-bits-clear. The history of that one is interesting - it was introduced in 2.1.68pre1, when acct.c had been reworked and moved to separate file. Two months later (2.1.86) somebody has noticed that the sucker won't compile - there was no task_struct::io_usage. At which point the ac_io calculation had changed from encode_comp_t(current->io_usage) to encode_comp_t(0) and the bug in the next line (absolutely real back then, had it ever managed to compile) become a harmless bogosity. Looks like nobody has ever noticed until now. Anyway, let's bury that idiocy now that it got noticed. 17 years is long enough... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge commit 'ccbf62d8a284cf181ac28c8e8407dd077d90dd4b' into for-nextAl Viro2014-08-07
|\ | | | | | | backmerge to avoid kernel/acct.c conflict
| * sched: Make task->start_time nanoseconds basedThomas Gleixner2014-07-23
| | | | | | | | | | | | | | Simplify the timespec to nsec/usec conversions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * sched: Make task->real_start_time nanoseconds basedThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | Simplify the only user of this data by removing the timespec conversion. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * time: Export nsecs_to_jiffies()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | Required for moving drivers to the nanosecond based interfaces. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Provide ktime_get[*]_ns() helpersThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | A lot of code converts either timespecs or ktime_t to nanoseconds. Provide helper functions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Remove ktime_get_monotonic_offset()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | No more users. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * drm: Use ktime_mono_to_real()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | Convert the monotonic timestamp with ktime_mono_to_real() in drm_calc_vbltimestamp_from_scanoutpos(). In get_drm_timestamp we can call either ktime_get() or ktime_get_real() depending on drm_timestamp_monotonic. No point in having two calls into the core for CLOCK_REALTIME. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * input: evdev: Use ktime_mono_to_real()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | Convert the monotonic timestamp with ktime_mono_to_real() in evdev_events(). In evdev_queue_syn_dropped() we can call either ktime_get() or ktime_get_real() depending on the clkid. No point in having two calls for CLOCK_REALTIME. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timerfd: Use ktime_mono_to_real()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | We have a few other use cases of ktime_get_monotonic_offset() which can be optimized with ktime_mono_to_real(). The timerfd code uses the offset only for comparison, so we can use ktime_mono_to_real(0) for this as well. Funny enough text size shrinks with that on ARM and x8664 !? Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Provide ktime_mono_to_any()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | ktime based conversion function to map a monotonic time stamp to a different CLOCK. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping; Use ktime based data for ktime_get_update_offsets_tick()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | No need to juggle with timespecs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Use ktime_t data for ktime_get_update_offsets_now()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | No need to juggle with timespecs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Use ktime_t based data for ktime_get_clocktai()Thomas Gleixner2014-07-23
| | | | | | | | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping; Use ktime_t based data for ktime_get_boottime()Thomas Gleixner2014-07-23
| | | | | | | | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Use ktime_t based data for ktime_get_real()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | Speed up the readout. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Provide ktime_get_with_offset()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | Provide a helper function which lets us implement ktime_t based interfaces for real, boot and tai clocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Use ktime_t based data for ktime_get()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | Speed up ktime_get() by using ktime_t based data. Text size shrinks by 64 bytes on x8664. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Provide internal ktime_t based dataThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | The ktime_t based interfaces are used a lot in performance critical code pathes. Add ktime_t based data so the interfaces don't have to convert from the xtime/timespec based data. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Use timekeeping_update() instead of memcpy()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | We already have a function which does the right thing, that also makes sure that the coming ktime_t based cached values are getting updated. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Cache optimize struct timekeeperThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | | | | | struct timekeeper is quite badly sorted for the hot readout path. Most time access functions need to load two cache lines. Rearrange it so ktime_get() and getnstimeofday() are happy with a single cache line. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeper: Move tk_xtime to core codeThomas Gleixner2014-07-23
| | | | | | | | | | | | | | No users outside of the core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Provide timespec64 based interfacesThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | To convert callers of the core code to timespec64 we need to provide the proper interfaces. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * time: Consolidate the time accessor prototypesThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | Right now we have time related prototypes in 3 different header files. Move it to a single timekeeping header file and move the core internal stuff into a core private header. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Convert timekeeping core to use timespec64sJohn Stultz2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | Convert the core timekeeping logic to use timespec64s. This moves the 2038 issues out of the core logic and into all of the accessor functions. Future changes will need to push the timespec64s out to all timekeeping users, but that can be done interface by interface. Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * time: More core infrastructure for timespec64John Stultz2014-07-23
| | | | | | | | | | | | | | | | Helper and conversion functions for timespec64. Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * time64: Add time64.h header and define struct timespec64John Stultz2014-07-23
| | | | | | | | | | | | | | | | | | | | Define the timespec64 structure and standard helper functions. [ tglx: Make it 32bit only. 64bit really can map timespec to timespec64 ] Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * ktime: Change ktime_set() to take 64bit seconds valueJohn Stultz2014-07-23
| | | | | | | | | | | | | | | | | | | | | | In order to support dates past 2038 on 32bit systems, ktime_set() needs to handle 64bit second values. [ tglx: Removed the BITS_PER_LONG check ] Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * ktime: Sanitize ktime_to_us/ms conversionThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | | | With the plain nanoseconds based ktime_t we can simply use ktime_divns() instead of going through loops and hoops of timespec/timeval conversion. Reported-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * ktime: Kill non-scalar ktime_t implementation for 2038John Stultz2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The non-scalar ktime_t implementation is basically a timespec which has to be changed to support dates past 2038 on 32bit systems. This patch removes the non-scalar ktime_t implementation, forcing the scalar s64 nanosecond version on all architectures. This may have additional performance overhead on some 32bit systems when converting between ktime_t and timespec structures, however the majority of 32bit systems (arm and i386) were already using scalar ktime_t, so no performance regressions will be seen on those platforms. On affected platforms, I'm open to finding optimizations, including avoiding converting to timespecs where possible. [ tglx: We can now cleanup the ktime_t.tv64 mess, but thats a different issue and we can throw a coccinelle script at it ] Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * hrtimer: Cleanup hrtimer accessors to the timekepeing stateJohn Stultz2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Rather then having two similar but totally different implementations that provide timekeeping state to the hrtimer code, try to unify the two implementations to be more simliar. Thus this clarifies ktime_get_update_offsets to ktime_get_update_offsets_now and changes get_xtime... to ktime_get_update_offsets_tick. Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * timekeeping: Simplify arch_gettimeoffset()Thomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | Provide a default stub function instead of having the extra conditional. Cuts binary size on a m68k build by ~100 bytes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * tile: Convert VDSO timekeeping to the precise mechanismThomas Gleixner2014-07-23
| | | | | | | | | | | | | | | | | | The code was only halfarsed converted to the new VSDO update mechanism and still uses the inaccurate base value which lacks the fractional part of xtime_nsec. Fix it up. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * tools: add script to test udelayDavid Riley2014-07-23
| | | | | | | | | | | | | | | | This script makes use of the udelay_test module to exercise udelay() and ensure that it is delaying long enough (as compared to ktime). Signed-off-by: David Riley <davidriley@chromium.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * kernel: time: Add udelay_test module to validate udelayDavid Riley2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Create a module that allows udelay() to be executed to ensure that it is delaying at least as long as requested (with a little bit of error allowed). There are some configurations which don't have reliably udelay due to using a loop delay with cpufreq changes which should use a counter time based delay instead. This test aims to identify those configurations where timing is unreliable. Signed-off-by: David Riley <davidriley@chromium.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
| * Merge branch 'clockevents/3.17' of ↵Thomas Gleixner2014-07-23
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.linaro.org/people/daniel.lezcano/linux into timers/core Pull clockevents from Danel Lezcano: * New timer driver for the Cirrus Logic CLPS711X SoC * New driver for the Mediatek SoC which includes: * A new function for of, acked by Rob Herring * Move the PXA driver to drivers/clocksource, add DT support * Optimization of the exynos_mct driver * DT support for the renesas timers family. * Some Kconfig and driver fixlets
| | * clocksource: exynos_mct: Only use 32-bits where possibleDoug Anderson2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The MCT has a nice 64-bit counter. That means that we _can_ register as a 64-bit clocksource and sched_clock. ...but that doesn't mean we should. The 64-bit counter is read by reading two 32-bit registers. That means reading needs to be something like: - Read upper half - Read lower half - Read upper half and confirm that it hasn't changed. That wouldn't be terrible, but: - THe MCT isn't very fast to access (hundreds of nanoseconds). - The clocksource is queried _all the time_. In total system profiles of real workloads on ChromeOS, we've seen exynos_frc_read() taking 2% or more of CPU time even after optimizing the 3 reads above to 2 (see below). The MCT is clocked at ~24MHz on all known systems. That means that the 32-bit half of the counter rolls over every ~178 seconds. This inspired an optimization in ChromeOS to cache the upper half between calls, moving 3 reads to 2. ...but we can do better! Having a 32-bit timer that flips every 178 seconds is more than sufficient for Linux. Let's just use the lower half of the MCT. Times on 5420 to do 1000000 gettimeofday() calls from userspace: * Original code: 1323852 us * ChromeOS cache upper half: 1173084 us * ChromeOS + ldmia to optimize: 1045674 us * Use lower 32-bit only (this code): 1014429 us As you can see, the time used doesn't increase linearly with the number of reads and we can make 64-bit work almost as fast as 32-bit with a bit of assembly code. But since there's no real gain for 64-bit, let's go with the simplest and fastest implementation. Note: with this change roughly half the time for gettimeofday() is spent in exynos_frc_read(). The rest is timer / system call overhead. Also note: this patch disables the use of the MCT on ARM64 systems until we've sorted out how to make "cycles_t" always 32-bit. Really ARM64 systems should be using arch timers anyway. Signed-off-by: Doug Anderson <dianders@chromium.org> Acked-by Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
| | * clocksource: exynos_mct: Use readl_relaxed/writel_relaxedDoug Anderson2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | Using the __raw functions is discouraged. Update the file to consistently use the proper functions. Signed-off-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
| | * ARM: pxa: Add non device-tree timer link to clocksourceRobert Jarzmik2014-07-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As clocksource pxa_timer was moved to clocksource framework, the pxa_timer initialization needs to be a bit amended, to pass the necessary informations to clocksource, ie : - the timer interrupt (mach specific) - the timer registers base (ditto) - the timer clockrate Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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