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Re: [Qemu-devel] [PATCH 0/6] hypertrace: Lightweight guest-to-QEMU trace
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH 0/6] hypertrace: Lightweight guest-to-QEMU trace channel |
Date: |
Thu, 18 Aug 2016 10:47:20 +0100 |
User-agent: |
Mutt/1.6.2 (2016-07-01) |
On Fri, Aug 05, 2016 at 06:59:23PM +0200, Lluís Vilanova wrote:
> The hypertrace channel allows guest code to emit events in QEMU (the host)
> using
> its tracing infrastructure (see "docs/trace.txt"). This works in both 'system'
> and 'user' modes. That is, hypertrace is to tracing, what hypercalls are to
> system calls.
>
> You can use this to emit an event on both guest and QEMU (host) traces to
> easily
> synchronize or correlate them. You could also modify you guest's tracing
> system
> to emit all events through the hypertrace channel, providing a unified and
> fully
> synchronized trace log. Another use case is timing the performance of guest
> code
> when optimizing TCG (QEMU traces have a timestamp).
>
> See first commit for a full description.
>
> Signed-off-by: Lluís Vilanova <address@hidden>
> ---
CCing Steven Rostedt, Masami Hiramatsu, Luiz Capitulino, and LTTng folks
who have all looked into host/guest tracing solutions.
Here is a mailing list archive link to this email thread:
https://lists.gnu.org/archive/html/qemu-devel/2016-08/msg01081.html
>
> Lluís Vilanova (6):
> hypertrace: Add documentation
> hypertrace: Add tracing event "guest_hypertrace"
> hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event
> hypertrace: [softmmu] Add QEMU-side proxy to "guest_hypertrace" event
> hypertrace: Add guest-side user-level library
> hypertrace: Add guest-side Linux module
>
>
> Makefile | 8 -
> Makefile.objs | 6
> bsd-user/main.c | 16 +
> bsd-user/mmap.c | 2
> bsd-user/syscall.c | 4
> configure | 42 +++
> docs/hypertrace.txt | 141 ++++++++++
> docs/tracing.txt | 3
> hypertrace/Makefile.objs | 20 +
> hypertrace/guest/linux-module/Kbuild.in | 5
> hypertrace/guest/linux-module/Makefile | 24 ++
> .../include/linux/qemu-hypertrace-internal.h | 46 +++
> .../linux-module/include/linux/qemu-hypertrace.h | 71 +++++
> hypertrace/guest/linux-module/qemu-hypertrace.c | 133 +++++++++
> hypertrace/guest/user/Makefile | 28 ++
> hypertrace/guest/user/common.c | 221 +++++++++++++++
> hypertrace/guest/user/qemu-hypertrace.h | 77 +++++
> hypertrace/softmmu.c | 243 +++++++++++++++++
> hypertrace/user.c | 292
> ++++++++++++++++++++
> hypertrace/user.h | 52 ++++
> include/hw/pci/pci.h | 2
> linux-user/main.c | 19 +
> linux-user/mmap.c | 2
> linux-user/syscall.c | 3
> trace/Makefile.objs | 2
> 25 files changed, 1460 insertions(+), 2 deletions(-)
> create mode 100644 docs/hypertrace.txt
> create mode 100644 hypertrace/Makefile.objs
> create mode 100644 hypertrace/guest/linux-module/Kbuild.in
> create mode 100644 hypertrace/guest/linux-module/Makefile
> create mode 100644
> hypertrace/guest/linux-module/include/linux/qemu-hypertrace-internal.h
> create mode 100644
> hypertrace/guest/linux-module/include/linux/qemu-hypertrace.h
> create mode 100644 hypertrace/guest/linux-module/qemu-hypertrace.c
> create mode 100644 hypertrace/guest/user/Makefile
> create mode 100644 hypertrace/guest/user/common.c
> create mode 100644 hypertrace/guest/user/qemu-hypertrace.h
> create mode 100644 hypertrace/softmmu.c
> create mode 100644 hypertrace/user.c
> create mode 100644 hypertrace/user.h
>
>
> To: address@hidden
> Cc: Stefan Hajnoczi <address@hidden>
>
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- Re: [Qemu-devel] [PATCH 2/6] hypertrace: Add tracing event "guest_hypertrace", (continued)
Re: [Qemu-devel] [PATCH 0/6] hypertrace: Lightweight guest-to-QEMU trace channel, Stefan Hajnoczi, 2016/08/18