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2016-06-07qemu-timer: Use DIV_ROUND_UPLaurent Vivier1-1/+1
Replace (((n) + (d) - 1) /(d)) by DIV_ROUND_UP(n,d). This patch is the result of coccinelle script scripts/coccinelle/round.cocci CC: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2016-03-15icount: decouple warp callsPavel Dovgalyuk1-1/+3
qemu_clock_warp function is called to update virtual clock when CPU is sleeping. This function includes replay checkpoint to make execution deterministic in icount mode. Record/replay module flushes async event queue at checkpoints. Some of the events (e.g., block devices operations) include interaction with hardware. E.g., APIC polled by block devices sets one of IRQ flags. Flag to be set depends on currently executed thread (CPU or iothread). Therefore in replay mode we have to process the checkpoints in the same thread as they were recorded. qemu_clock_warp function (and its checkpoint) may be called from different thread. This patch decouples two different execution cases of this function: call when CPU is sleeping from iothread and call from cpu thread to update virtual clock. First task is performed by qemu_start_warp_timer function. It sets warp timer event to the moment of nearest pending virtual timer. Second function (qemu_account_warp_timer) is called from cpu thread before execution of the code. It advances virtual clock by adding the length of period while CPU was sleeping. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20160310115609.4812.44986.stgit@PASHA-ISP> [Update docs. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-02-04all: Clean up includesPeter Maydell1-0/+1
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1454089805-5470-16-git-send-email-peter.maydell@linaro.org
2015-11-06replay: checkpointsPavel Dovgalyuk1-7/+34
This patch introduces checkpoints that synchronize cpu thread and iothread. When checkpoint is met in the code all asynchronous events from the queue are executed. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20150917162444.8676.52916.stgit@PASHA-ISP.def.inno> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
2015-11-06replay: recording and replaying clock ticksPavel Dovgalyuk1-3/+5
Clock ticks are considered as the sources of non-deterministic data for virtual machine. This patch implements saving the clock values when they are acquired (virtual, host clock). When replaying the execution corresponding values are read from log and transfered to the module, which wants to read the values. Such a design required the clock polling to be synchronized. Sometimes it is not true - e.g. when timeouts for timer lists are checked. In this case we use a cached value of the clock, passing it to the client code. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20150917162427.8676.36558.stgit@PASHA-ISP.def.inno> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
2015-07-22qemu-timer: initialize "timers_done_ev" to setPaolo Bonzini1-1/+1
The normal value for the event is to be set. If we do not do this, pause_all_vcpus (through qemu_clock_enable) hangs unless timerlist_run_timers has been run at least once for the timerlist. This can happen with the following patches, that make aio_notify do nothing most of the time. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Tested-by: Richard W.M. Jones <rjones@redhat.com> Message-id: 1437487673-23740-2-git-send-email-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-06-19qemu-timer: Call clock reset notifiers on forward jumpsPaul Donohue1-1/+1
Commit 691a0c9c introduced a mechanism by which QEMU_CLOCK_HOST can notify other parts of the emulator when the host clock has jumped backward. This is used to avoid stalling timers that were scheduled based on the host clock. However, if the host clock jumps forward, then timers that were scheduled based on the host clock may fire rapidly and cause other problems. For example, the mc146818rtc periodic timer will block execution of the VM and consume host CPU while firing every interrupt for the time period that was skipped by the host clock. To correct that problem, this commit fires the reset notification if the host clock jumps forward by more than a hard-coded limit. The limit is currently set to a value of 60 seconds, which should be small enough to prevent excessive timer loops, but large enough to avoid frequent resets in idle VMs. Signed-off-by: Paul Donohue <qemu-git@PaulSD.com> Message-Id: <20150612140845.GD2749@TopQuark.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-26qemu-timer.c: Trim list of included headersPeter Maydell1-6/+2
qemu-timer.c was including a lot more headers than it needed to, presumably for historical reasons. In particular, it included ui/console.h; this now tries to pull in <pixman.h>, which will cause a compilation failure in --disable-tools --disable-system configurations when running "make check" (which builds qemu-timer.c, even though the linux-user binaries themselves don't need it). Fix this build failure by trimming down the set of included headers severely -- we only really need main-loop.h and timer.h. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1421770600-17525-1-git-send-email-peter.maydell@linaro.org
2015-01-26qemu-timer: introduce timer_deinitPaolo Bonzini1-3/+11
In some cases, a timer was set to NULL so that we could check if it is initialized. Use the timer_list field instead, and add a timer_deinit function that NULLs it. It then makes sense that timer_del be a no-op (instead of a crasher) on such a de-initialized timer. It avoids the need to poke at the timerlist field to check if the timers are initialized. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-14qemu-timer: rename timer_init to timer_init_tlPaolo Bonzini1-3/+3
timer_init is not called that often. Free the name for an equivalent of timer_new. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-12-15Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell1-0/+2
- Migration and linuxboot fixes for 2.2 regressions - valgrind/KVM support - small i386 patches - PCI SD host controller support - malloc/free cleanups from Markus (x86/scsi) - IvyBridge model - XSAVES support for KVM - initial patches from record/replay # gpg: Signature made Mon 15 Dec 2014 16:35:08 GMT using RSA key ID 78C7AE83 # gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" # gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" # gpg: WARNING: This key is not certified with sufficiently trusted signatures! # gpg: It is not certain that the signature belongs to the owner. # Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1 # Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83 * remotes/bonzini/tags/for-upstream: (47 commits) sdhci: Support SDHCI devices on PCI sdhci: Define SDHCI PCI ids sdhci: Add "sysbus" to sdhci QOM types and methods sdhci: Remove class "virtual" methods sdhci: Set a default frequency clock serial: only resample THR interrupt on rising edge of IER.THRI serial: update LSR on enabling/disabling FIFOs serial: clean up THRE/TEMT handling serial: reset thri_pending on IER writes with THRI=0 linuxboot: fix loading old kernels kvm/apic: fix 2.2->2.1 migration target-i386: add Ivy Bridge CPU model target-i386: add f16c and rdrand to Haswell and Broadwell target-i386: add VME to all CPUs pc: add 2.3 machine types i386: do not cross the pages boundaries in replay mode cpus: make icount warp behave well with respect to stop/cont timer: introduce new QEMU_CLOCK_VIRTUAL_RT clock cpu-exec: invalidate nocache translation if they are interrupted icount: introduce cpu_get_icount_raw ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-12-15timer: introduce new QEMU_CLOCK_VIRTUAL_RT clockPavel Dovgalyuk1-0/+2
This patch introduces new QEMU_CLOCK_VIRTUAL_RT clock, which should be used for icount warping. In the next patch, it will be used to avoid a huge icount warp when a virtual machine is stopped for a long time. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-11-27qemu-timer: Avoid overflows when converting timeout to struct timespecPeter Maydell1-1/+8
In qemu_poll_ns(), when we convert an int64_t nanosecond timeout into a struct timespec, we may accidentally run into overflow problems if the timeout is very long. This happens because the tv_sec field is a time_t, which is signed, so we might end up setting it to a negative value by mistake. This will result in what was intended to be a near-infinite timeout turning into an instantaneous timeout, and we'll busy loop. Cap the maximum timeout at INT32_MAX seconds (about 68 years) to avoid this problem. This specifically manifested on ARM hosts as an extreme slowdown on guest shutdown (when the guest reprogrammed the PL031 RTC to not generate alarms using a very long timeout) but could happen on other hosts and guests too. Reported-by: Christoffer Dall <christoffer.dall@linaro.org> Cc: qemu-stable@nongnu.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 1416939705-1272-1-git-send-email-peter.maydell@linaro.org
2014-05-09vl.c: remove init_clocks call from mainKirill Batuzov1-0/+3
Clocks are initialized in qemu_init_main_loop. They are not needed before it. Initializing them twice is not only unnecessary but is harmful: it results in memory leak and potentially can lead to a situation where different parts of QEMU use different sets of timers. To avoid it remove init_clocks call from main and add an assertion to qemu_clock_init that corresponding clock has not been initialized yet. Signed-off-by: Kirill Batuzov <batuzovk@ispras.ru> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-07qemu-timer: Add missing 'static' attributeStefan Weil1-1/+1
This fixes a warning from the static code analysis (smatch). Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2013-10-17timer: add timer_mod_anticipate and timer_mod_anticipate_nsPaolo Bonzini1-0/+29
These let a user anticipate the deadline of a timer, atomically with other sites that call the function. This helps avoiding complicated lock hierarchies. Reviewed-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-10-17timer: extract timer_mod_ns_locked and timerlist_rearmPaolo Bonzini1-19/+32
These will be reused in timer_mod_anticipate functions. Reviewed-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-10-17timer: make qemu_clock_enable sync between disable and timer's cbLiu Ping Fan1-1/+22
After disabling the QemuClock, we should make sure that no QemuTimers are still in flight. To implement that with light overhead, we resort to QemuEvent. The caller of disabling will wait on QemuEvent of each timerlist. Note, qemu_clock_enable(foo,false) can _not_ be called from timer's cb. Also, the callers of qemu_clock_enable() should be protected by the BQL. Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-09-18qemu-timer: do not take the lock in timer_pendingPaolo Bonzini1-14/+5
We can deduce the result from expire_time, by making it always -1 if the timer is not in the active_timers list. We need to check against negative times passed to timer_mod_ns; clamping them to zero is not a problem because the only clock that has a zero value at VM startup is QEMU_CLOCK_VIRTUAL, and it is monotonic so it cannot be non-zero. QEMU_CLOCK_HOST, instead, is not monotonic but it cannot go to negative values unless the host time is seriously screwed up and points to the 1960s. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-18qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safeStefan Hajnoczi1-19/+68
Introduce QEMUTimerList->active_timers_lock to protect the linked list of active timers. This allows qemu_timer_mod_ns() to be called from any thread. Note that vm_clock is not thread-safe and its use of qemu_clock_has_timers() works fine today but is also not thread-safe. The purpose of this patch is to eventually let device models set or cancel timers from a vcpu thread without holding the global mutex. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-18qemu-timer: drop outdated signal safety commentsStefan Hajnoczi1-4/+0
host_alarm_handler() is invoked from the signal processing thread (currently the iothread). Previously we did processing in a real signal handler with signalfd and therefore needed signal-safe timer code. Today host_alarm_handler() just marks the alarm timer as expired/pending and notifies the main loop using qemu_notify_event(). Therefore these outdated comments about signal safety can be dropped. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Remove legacy interfaceAlex Bligh1-32/+3
Remove the legacy interface from include/qemu/timers.h. Ensure struct QEMUClock is not exposed at all. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Remove main_loop_timerlistAlex Bligh1-36/+27
Now we have timerlistgroups implemented and main_loop_tlg, we no longer need the concept of a default timer list associated with each clock. Remove it and simplify initialisation of clocks and timer lists. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Rearrange timer.h & make legacy functions call non-legacyAlex Bligh1-37/+63
Rearrange timer.h so it is in order by function type. Make legacy functions call non-legacy functions rather than vice-versa. Convert cpus.c to use new API. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Remove legacy qemu_clock_deadline & qemu_timerlist_deadlineAlex Bligh1-20/+0
Remove qemu_clock_deadline and qemu_timerlist_deadline now we are using the ns functions throughout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Remove alarm timersAlex Bligh1-499/+1
Remove alarm timers from qemu-timers.c now we use g_poll / ppoll instead. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Use all timerlists in icount warp calculationsAlex Bligh1-0/+16
Notify all timerlists derived from vm_clock in icount warp calculations. When calculating timer delay based on vm_clock deadline, use all timerlists. For compatibility, maintain an apparent bug where when using icount, if no vm_clock timer was set, qemu_clock_deadline would return INT32_MAX and always set an icount clock expiry about 2 seconds ahead. NB: thread safety - when different timerlists sit on different threads, this will need some locking. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: On timer modification, qemu_notify or aio_notifyAlex Bligh1-3/+10
On qemu_mod_timer_ns, ensure qemu_notify or aio_notify is called to end the appropriate poll(), irrespective of use_icount value. On qemu_clock_enable, ensure qemu_notify or aio_notify is called for all QEMUTimerLists attached to the QEMUClock. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Add a notify callback to QEMUTimerListAlex Bligh1-7/+24
Add a notify pointer to QEMUTimerList so it knows what to notify on a timer change. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Add QEMUTimerListGroup and helper functionsAlex Bligh1-0/+42
Add QEMUTimerListGroup and helper functions, to represent a QEMUTimerList associated with each clock. Add a default QEMUTimerListGroup representing the default timer lists which are not associated with any other object (e.g. an AioContext as added by future patches). Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Split QEMUClock into QEMUClock and QEMUTimerListAlex Bligh1-56/+151
Split QEMUClock into QEMUClock and QEMUTimerList so that we can have more than one QEMUTimerList associated with the same clock. Introduce a main_loop_timerlist concept and make existing qemu_clock_* calls that actually should operate on a QEMUTimerList call the relevant QEMUTimerList implementations, using the clock's default timerlist. This vastly reduces the invasiveness of this change and means the API stays constant for existing users. Introduce a list of QEMUTimerLists associated with each clock so that reenabling the clock can cause all the notifiers to be called. Note the code to do the notifications is added in a later patch. Switch QEMUClockType to an enum. Remove global variables vm_clock, host_clock and rt_clock and add compatibility defines. Do not fix qemu_next_alarm_deadline as it's going to be deleted. Add qemu_clock_use_for_deadline to indicate whether a particular clock should be used for deadline calculations. When use_icount is true, vm_clock should not be used for deadline calculations as it does not contain a nanosecond count. Instead, icount timeouts come from the execution thread doing aio_notify or qemu_notify as appropriate. This function is used in the next patch. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Make qemu_run_timers and qemu_run_all_timers return progressAlex Bligh1-6/+12
Make qemu_run_timers and qemu_run_all_timers return progress so that aio_poll etc. can determine whether a timer has been run. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Add prctl(PR_SET_TIMERSLACK, 1, ...) to reduce timer slackAlex Bligh1-0/+7
Where supported, called prctl(PR_SET_TIMERSLACK, 1, ...) to set one nanosecond timer slack to increase precision of timer calls. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: add ppoll support with qemu_poll_nsAlex Bligh1-0/+24
Add qemu_poll_ns which works like g_poll but takes a nanosecond timeout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Consistent treatment of disabled clocks for deadlinesAlex Bligh1-1/+1
Make treatment of disabled clocks consistent in deadline calculation Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: add qemu-timer.c utility functionsAlex Bligh1-0/+50
Add utility functions to qemu-timer.c for nanosecond timing. Add qemu_clock_deadline_ns to calculate deadlines to nanosecond accuracy. Add utility function qemu_soonest_timeout to calculate soonest deadline. Add qemu_timeout_ns_to_ms to convert a timeout in nanoseconds back to milliseconds for when ppoll is not used. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Rename qemu_new_clock and expose clock typesAlex Bligh1-8/+4
Rename qemu_new_clock to qemu_clock_new. Expose clock types. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Rename qemu_timer_* functionsAlex Bligh1-10/+10
Rename four functions in preparation for new API. Rename qemu_timer_expired to timer_expired Rename qemu_timer_expire_time_ns to timer_expire_time_ns Rename qemu_timer_pending to timer_pending Rename qemu_timer_expired_ns to timer_expired_ns Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-04-12qemu-timer: move timeBeginPeriod/timeEndPeriod to os-win32Paolo Bonzini1-18/+6
These are needed for any of the Win32 alarm timer implementations. They are not tied to mmtimer exclusively. Jacob tested this patch with both mmtimer and Win32 timers. Cc: qemu-stable@nongnu.org Tested-by: Jacob Kroon <jacob.kroon@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Weil <sw@weilnetz.de>
2012-12-19softmmu: move include files to include/sysemu/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini1-2/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19monitor: move include files to include/monitor/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19ui: move files to ui/ and include/ui/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19net: do not include net.h everywherePaolo Bonzini1-1/+0
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-11-10qemu-timer: Fix compilation for non-POSIX hostsStefan Weil1-0/+2
A compiler warning is caused by the unused local function reinit_timers on non-POSIX hosts. Include that function only for POSIX hosts. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2012-11-04build: pthread_atfork() needs include of pthread.hAnthony Liguori1-0/+3
Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-11-02qemu-timer: reinitialize timers after forkPaolo Bonzini1-0/+14
Timers are not inherited by the child of a fork(2), so just use pthread_atfork to reinstate them after daemonize. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-10-31Merge remote-tracking branch 'origin/master' into threadpoolPaolo Bonzini1-2/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-30qemu-timer: make initialization functions idempotentPaolo Bonzini1-3/+9
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-28qemu-timer: Check for usable fields for SIGEV_THREAD_IDRichard Henderson1-2/+2
Older glibc (RHEL 5.x, Debian 5.x) does not have the _sigev_un._tid member in its structure definition, while the accompanying kernel headers do define SIGEV_THREAD_ID. We need configure to check for both before using it. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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