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[Qemu-devel] [PATCH v2 00/12] icount and misc MTTCG fixes for 2.9-rc4
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v2 00/12] icount and misc MTTCG fixes for 2.9-rc4 |
Date: |
Wed, 5 Apr 2017 14:24:51 +0100 |
Hi,
Here is my current queue for icount and miscellaneous MTTCG related
fixes. The main difference from the RFC series is I have dropped the
graceful handling of backward time events in the replay log in favour
of updating the global qemu_icount more frequently. The graceful
handling is now replaced with an assertion about the arrow of time.
With these changes I was able to dispenses with additional BQL locking
which I had been applying during cpu_handle_exception.
It doesn't completely solve the problem of keeping the main-loop and
vCPU events stream in sync but it works pretty reliably in my test
case. Given the current release time-line I think this is the best
solution for now. Options for post-2.9 include either replacing the
BQL mediated sequencing with a new lock (pushing replay_lock up the
tree?) or marshalling events through a single thread which can then
keep things in order.
Aside from that other patches have had various r-b and a-b tags
applied from the original posting.
I hope to roll a pull request with these fixes by the end of the week
so we there isn't a rush for next Tuesday's rc4. Expedient comments
and reviews are therefor gratefully received ;-)
Regards,
Alex Bennée (12):
scripts/qemugdb/mtree.py: fix up mtree dump
scripts/qemu-gdb/timers.py: new helper to dump timer state
scripts/replay-dump.py: replay log dumper
target/i386/misc_helper: wrap BQL around another IRQ generator
cpus: remove icount handling from qemu_tcg_cpu_thread_fn
cpus: check cpu->running in cpu_get_icount_raw()
cpus: move icount preparation out of tcg_exec_cpu
cpus: don't credit executed instructions before they have run
cpus: introduce cpu_update_icount helper
cpu-exec: update icount after each TB_EXIT
cpus: call cpu_update_icount on read
replay: assert time only goes forward
cpu-exec.c | 14 +--
cpus.c | 98 ++++++++++++-----
include/qemu/timer.h | 1 +
include/qom/cpu.h | 1 +
replay/replay-internal.c | 4 +
replay/replay.c | 4 +
scripts/qemu-gdb.py | 3 +-
scripts/qemugdb/mtree.py | 12 +-
scripts/qemugdb/timers.py | 54 +++++++++
scripts/replay-dump.py | 272 ++++++++++++++++++++++++++++++++++++++++++++++
target/i386/misc_helper.c | 3 +
11 files changed, 426 insertions(+), 40 deletions(-)
create mode 100644 scripts/qemugdb/timers.py
create mode 100755 scripts/replay-dump.py
--
2.11.0
- [Qemu-devel] [PATCH v2 00/12] icount and misc MTTCG fixes for 2.9-rc4,
Alex Bennée <=
- [Qemu-devel] [PATCH v2 02/12] scripts/qemu-gdb/timers.py: new helper to dump timer state, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 03/12] scripts/replay-dump.py: replay log dumper, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 05/12] cpus: remove icount handling from qemu_tcg_cpu_thread_fn, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 04/12] target/i386/misc_helper: wrap BQL around another IRQ generator, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 06/12] cpus: check cpu->running in cpu_get_icount_raw(), Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 01/12] scripts/qemugdb/mtree.py: fix up mtree dump, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 08/12] cpus: don't credit executed instructions before they have run, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 07/12] cpus: move icount preparation out of tcg_exec_cpu, Alex Bennée, 2017/04/05
- [Qemu-devel] [PATCH v2 09/12] cpus: introduce cpu_update_icount helper, Alex Bennée, 2017/04/05