Commit Graph

29 Commits

Author SHA1 Message Date
Anthony Liguori 7267c0947d Use glib memory allocation and free functions
qemu_malloc/qemu_free no longer exist after this commit.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-20 23:01:08 -05:00
Jan Kiszka d25f89c9e9 Register Linux dyntick timer as per-thread signal
Derived from kvm-tool patch
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/74309

Ingo Molnar pointed out that sending the timer signal to the whole
process, just blocking it everywhere, is suboptimal with an increasing
number of threads. QEMU is also using this pattern so far.

Linux provides a (non-portable) way to restrict the signal to a single
thread: We can use SIGEV_THREAD_ID unless we are forced to emulate
signalfd via an additional thread. That case could theoretically be
optimized as well, but it doesn't look worth bothering.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 11:26:12 -05:00
Jan Kiszka 691a0c9c9b qemu-timer: Introduce clock reset notifier
QEMU_CLOCK_HOST is based on the system time which may jump backward in
case the admin or NTP adjusts it. RTC emulations and other device models
can suffer in this case as timers will stall for the period the clock
was tuned back.

This adds a detection mechanism that checks on every host clock readout
if the new time is before the last result. If that is the case a
notifier list is informed. Device models interested in this event can
register a notifier with the clock.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 11:26:12 -05:00
Paolo Bonzini 84682834eb qemu-timer: change unix timer to dynticks
A timer that wakes up every millisecond puts a lot of stress on the
iothread.  The large amount of IPIs causes very high context switch
activity, making emulation slow and the UI unusable.  This is by the
way the same reason why the Windows timers were switched to dynticks.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 11:18:57 -05:00
Anthony Liguori 25f3151ece timer: drop HPET and RTC
dynticks will provide equally good timer granularity on all modern Linux
systems.  This is more or less dead code these days.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-06 08:54:55 -05:00
Stefan Weil 2f9cba0c14 qemu-timer: Fix timers for w32
Commit 68c23e5520 removed the
multimedia timer, but this timer is needed for certain
Linux kernels. Otherwise Linux boot stops with this error:

    MP-BIOS bug: 8254 timer not connected to IO-APIC

So the multimedia timer is added again here.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-27 13:30:18 +02:00
Stefan Weil cd0544ee55 qemu-timer: Avoid type casts
The type casts are no longer needed after some small changes
in struct qemu_alarm_timer. This also improves readability
of the code.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-27 13:30:18 +02:00
Stefan Weil 45c7b37fb9 qemu-timer: Add and use new function qemu_timer_expired_ns
This simply moves code which is used three times
into a new function thus improving readability.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-27 13:30:18 +02:00
Paolo Bonzini cb842c90a4 qemu_next_deadline should not consider host-time timers
It is purely for icount-based virtual timers.  And now that we got the
code right, rename the function to clarify the intended scope.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-15 09:27:56 +02:00
Paolo Bonzini 1ece93a91b Revert wrong fixes for -icount in the iothread case
This reverts commits 225d02cd and c9f7383c.  While some parts of
the latter could be saved, I preferred a smooth, complete revert.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-15 09:27:56 +02:00
Paolo Bonzini ab33fcda9f enable vm_clock to "warp" in the iothread+icount case
The previous patch however is not enough, because if the virtual CPU
goes to sleep waiting for a future timer interrupt to wake it up, qemu
deadlocks.  The timer interrupt never comes because time is driven by
icount, but the vCPU doesn't run any insns.

You could say that VCPUs should never go to sleep in icount
mode if there is a pending vm_clock timer; rather time should
just warp to the next vm_clock event with no sleep ever taking place.
Even better, you can sleep for some time related to the
time left until the next event, to avoid that the warps are too visible
externally; for example, you could be sending network packets continously
instead of every 100ms.

This is what this patch implements.  qemu_clock_warp is called: 1)
whenever a vm_clock timer is adjusted, to ensure the warp_timer is
synchronized; 2) at strategic points in the CPU thread, to make sure
the insn counter is synchronized before the CPU starts running.
In any case, the warp_timer is disabled while the CPU is running,
because the insn counter will then be making progress on its own.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-15 09:27:56 +02:00
Paolo Bonzini 6d5ad9bf93 remove qemu_get_clock
These patches are already not doing a great service to out-of-tree
modifications to QEMU.  However, at least we can warn them by getting
rid of the old confusing functions, or otherwise causing compilation
errors.  This patch removes qemu_get_clock; the previous one changed
qemu_new_timer's signature.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21 09:23:23 +01:00
Paolo Bonzini 4a998740b2 add a generic scaling mechanism for timers
This enables rt_clock timers to use nanosecond resolution, just by
using the _ns functions; there is really no reason to forbid that.

Migrated timers are all using vm_clock (of course; but I checked that
anyway) so the timers in the savevm files are already in nanosecond
resolution.  So this patch makes no change to the migration format.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21 09:23:23 +01:00
Paolo Bonzini 7447545544 change all other clock references to use nanosecond resolution accessors
This was done with:

    sed -i 's/qemu_get_clock\>/qemu_get_clock_ns/' \
        $(git grep -l 'qemu_get_clock\>' )
    sed -i 's/qemu_new_timer\>/qemu_new_timer_ns/' \
        $(git grep -l 'qemu_new_timer\>' )

after checking that get_clock and new_timer never occur twice
on the same line.  There were no missed occurrences; however, even
if there had been, they would have been caught by the compiler.

There was exactly one false positive in qemu_run_timers:

     -    current_time = qemu_get_clock (clock);
     +    current_time = qemu_get_clock_ns (clock);

which is of course not in this patch.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21 09:23:23 +01:00
Paolo Bonzini 7bd427d801 change all rt_clock references to use millisecond resolution accessors
This was done with:

    sed -i '/get_clock\>.*rt_clock/s/get_clock\>/get_clock_ms/' \
        $(git grep -l 'get_clock\>.*rt_clock' )
    sed -i '/new_timer\>.*rt_clock/s/new_timer\>/new_timer_ms/' \
        $(git grep -l 'new_timer\>.*rt_clock' )

after checking that get_clock and new_timer never occur twice
on the same line.  There were no missed occurrences; however, even
if there had been, they would have been caught by the compiler.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21 09:23:23 +01:00
Paolo Bonzini 68c23e5520 use win32 timer queues
Multimedia timers are only useful for compatibility with Windows NT 4.0
and earlier.  Plus, the implementation in Wine is extremely heavyweight.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-03-13 14:44:20 +00:00
Paolo Bonzini cfced5b2e6 implement win32 dynticks timer
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-03-13 14:44:20 +00:00
Paolo Bonzini c9f7383c6e do not use qemu_icount_delta in the !use_icount case
The !use_icount code is the same for iothread and non-iothread,
except that the timeout is different.  Since the timeout might as
well be infinite and is only masking bugs, use the higher value.
With this change the !use_icount code is handled equivalently
in qemu_icount_delta and qemu_calculate_timeout, and we rip it
out of the former.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
2011-02-23 10:42:32 +01:00
Stefan Weil f26e5a54f0 qemu-timer: Fix compilation of new timer code for w32, w64
qemu_next_alarm_deadline() is needed by MinGW, too.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-02-07 19:50:29 +00:00
Paolo Bonzini 4c3d45eb69 Unify alarm deadline computation
This patch shows how using the correct formula for
qemu_next_deadline_dyntick can simplify the code of
host_alarm_handler and eliminate useless duplication.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-02-04 06:33:26 -06:00
Paolo Bonzini 6ad0a1ed21 Correct alarm deadline computation
When the QEMU_CLOCK_HOST clock was added, computation of its
deadline was added to qemu_next_deadline, which is correct but
incomplete.

I noticed this by reading the very convoluted rules whereby
qemu_next_deadline_dyntick is computed, which miss QEMU_CLOCK_HOST
when use_icount is true.  This patch inlines qemu_next_deadline
into qemu_next_deadline_dyntick, and then corrects the logic to skip
only QEMU_CLOCK_VIRTUAL when use_icount is true.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-02-04 06:33:26 -06:00
Paolo Bonzini 9c13246ac1 use nanoseconds everywhere for timeout computation
Suggested by Aurelien Jarno.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-02-04 06:33:26 -06:00
Edgar E. Iglesias 225d02cd1a Avoid deadlock whith iothread and icount
When using the iothread together with icount, make sure the
qemu_icount counter makes forward progress when the vcpu is
idle to avoid deadlocks.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-01-23 04:44:51 +01:00
Blue Swirl c57c846a80 qemu-timer: move commonly used timer code to qemu-timer-common
Move timer init functions to a new file, qemu-timer-common.c. Make other
critical timer functions inlined to preserve performance in
qemu-timer.c, also move muldiv64() (used by the inline functions)
to qemu-timer.h.

Adjust block/raw-posix.c and simpletrace.c to use get_clock() directly.
Remove a similar/duplicate definition in qemu-tool.c.

Adjust hw/omap_clk.c to include qemu-timer.h because muldiv64() is used
there.

After this change, tracing can be used also for user code and
simpletrace on Win32.

Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-23 15:24:07 +00:00
Alex Williamson 0be71e324f savevm: Add DeviceState param
When available, we'd like to be able to access the DeviceState
when registering a savevm.  For buses with a get_dev_path()
function, this will allow us to create more unique savevm
id strings.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-07-06 10:36:28 -05:00
Blue Swirl 29e922b61f Compile qemu-timer only once
Arrange various declarations so that also non-CPU code can access
them, adjust users.

Move CPU specific code to cpus.c.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-03-29 19:24:00 +00:00
Juergen Lock 444593493c Add a missing #include for FreeBSD hosts
Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-27 14:38:25 +01:00
Paolo Bonzini ca5a2a4b12 fix race between timer firing vs. alarm_timer->pending = 0
The period for Win32 timers is very short and always the same
independent of dynticks, so it's possible that the timer fires
before qemu_run_all_timers has reset alarm_timer->pending to zero.
Reset alarm_timer->pending before rearming.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-27 14:05:07 +01:00
Paolo Bonzini db1a49726c split out qemu-timer.c
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-17 11:16:15 -05:00