Hi Steven,
(2012/08/22 22:51), Steven Rostedt wrote:
On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
Add read path and control path to use trace-agent of virtio-trace.
When we use trace-agent, trace-cmd will be used as follows:
# AGENT_READ_DIR=/tmp/virtio-trace/tracing
\
trace-cmd record -e "sched:*"
Here, AGENT_READ_DIR is the path for a reading directory of virtio-trace,
AGENT_CTL is a control path of trace-agent, and TRACING_DIR is a debugfs path
of a guest.
Signed-off-by: Yoshihiro YUNOMAE
---
trace-cmd.h |1 +
trace-recorde
nonblock option to open() and splice_read().
Signed-off-by: Yoshihiro YUNOMAE
---
trace-recorder.c | 13 -
1 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/trace-recorder.c b/trace-recorder.c
index 3b750e9..6577fe8 100644
--- a/trace-recorder.c
+++ b/trace-recorder.c
Use poll() for avoiding a busy loop to read trace data of a guest from FIFO.
Signed-off-by: Yoshihiro YUNOMAE
---
trace-recorder.c | 42 --
1 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/trace-recorder.c b/trace-recorder.c
index
From: Masami Hiramatsu
Count debugfs/tracing/per_cpu/cpu* to determine the
number of CPUs.
Signed-off-by: Masami Hiramatsu
Signed-off-by: Yoshihiro YUNOMAE
---
trace-record.c | 41 +
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a
From: Masami Hiramatsu
Use TRACE_DIR environment variable for setting
debugfs/tracing directory if defined. This is
for controlling guest(or remote) ftrace.
Signed-off-by: Masami Hiramatsu
Signed-off-by: Yoshihiro YUNOMAE
---
trace-util.c |9 +
1 files changed, 9 insertions
- Support for trace-cmd => done
- Support for 9pfs protocol
- Support for non-blocking mode in QEMU
Thank you,
---
Masami Hiramatsu (2):
trace-cmd: Use tracing directory to count CPUs
trace-cmd: Use TRACE_DIR envrionment variable if defined
Yoshihiro YUNOMAE (3):
trace-cm
g
- write trace data to stdout by using -o option
- controlled by start/stop orders from a Host
Changes in v2:
- Cleanup (change fprintf() to pr_err() and an include guard)
Signed-off-by: Yoshihiro YUNOMAE
---
tools/virtio/virtio-trace/Makefile | 14 +
tools/virtio/virtio-tr
From: Masami Hiramatsu
Use generic steal operation on pipe buffer to allow stealing
ring buffer's read page from pipe buffer.
Note that this could reduce the performance of splice on the
splice_write side operation without affinity setting.
Since the ring buffer's read pages are allocated on the
From: Masami Hiramatsu
Allocate scatterlist according to the current pipe size.
This allows splicing bigger buffer if the pipe size has
been changed by fcntl.
Changes in v2:
- Just a minor fix for avoiding a confliction with previous patch.
Signed-off-by: Masami Hiramatsu
---
drivers/char/v
From: Masami Hiramatsu
Wait if the port is not connected or full on splice
like as write is doing.
Signed-off-by: Masami Hiramatsu
---
drivers/char/virtio_console.c | 39 +++
1 files changed, 27 insertions(+), 12 deletions(-)
diff --git a/drivers/char/vi
From: Masami Hiramatsu
Add a failback memcpy path for unstealable pipe buffer.
If buf->ops->steal() fails, virtio-serial tries to
copy the page contents to an allocated page, instead
of just failing splice().
Signed-off-by: Masami Hiramatsu
---
drivers/char/virtio_console.c | 28 +++
From: Masami Hiramatsu
Enable to use splice_write from pipe to virtio-console port.
This steals pages from pipe and directly send it to host.
Note that this may accelerate only the guest to host path.
Changes in v2:
- Use GFP_KERNEL instead of GFP_ATOMIC in syscall context function.
Signed-of
e: Wait until the port is ready on splice
virtio/console: Add a failback for unstealable pipe buffer
virtio/console: Add splice_write support
Yoshihiro YUNOMAE (1):
tools: Add guest trace agent as a user tool
drivers/char/virtio_console.c | 198 +
Hi Amit,
Sorry for the late reply.
(2012/07/27 18:43), Amit Shah wrote:
On (Fri) 27 Jul 2012 [17:55:11], Yoshihiro YUNOMAE wrote:
Hi Amit,
Thank you for commenting on our work.
(2012/07/26 20:35), Amit Shah wrote:
On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote
Hi Amit,
Thank you for commenting on our work.
(2012/07/26 20:35), Amit Shah wrote:
On (Tue) 24 Jul 2012 [11:36:57], Yoshihiro YUNOMAE wrote:
[...]
Therefore, we propose a new system "virtio-trace", which uses enhanced
virtio-serial and existing ring-buffer of ftrace, for collec
Hi Stefan,
(2012/07/24 22:41), Stefan Hajnoczi wrote:
On Tue, Jul 24, 2012 at 12:19 PM, Yoshihiro YUNOMAE
wrote:
Are you using text formatted ftrace?
No, currently using raw format, but　we'd like to reformat it in text.
Capturing the info necessary to translate numbers into symbols i
Hi Stefan,
Thank you for commenting on our patch set.
(2012/07/24 20:03), Masami Hiramatsu wrote:
(2012/07/24 19:02), Stefan Hajnoczi wrote:
On Tue, Jul 24, 2012 at 3:36 AM, Yoshihiro YUNOMAE
wrote:
The performance of each method is compared as follows:
[1] Native
- only recording
From: Masami Hiramatsu
Allocate scatterlist according to the current pipe size.
This allows splicing bigger buffer if the pipe size has
been changed by fcntl.
Signed-off-by: Masami Hiramatsu
Cc: Amit Shah
Cc: Arnd Bergmann
Cc: Greg Kroah-Hartman
---
drivers/char/virtio_console.c | 23 +++
From: Masami Hiramatsu
Use generic steal operation on pipe buffer to allow stealing
ring buffer's read page from pipe buffer.
Note that this could reduce the performance of splice on the
splice_write side operation without affinity setting.
Since the ring buffer's read pages are allocated on the
g
- write trace data to stdout by using -o option
- controlled by start/stop orders from a Host
Signed-off-by: Yoshihiro YUNOMAE
---
tools/virtio/virtio-trace/Makefile | 14 +
tools/virtio/virtio-trace/README| 118
tools/virtio/virtio-trace/trace-agent-ct
From: Masami Hiramatsu
Wait if the port is not connected or full on splice
like as write is doing.
Signed-off-by: Masami Hiramatsu
Cc: Amit Shah
Cc: Arnd Bergmann
Cc: Greg Kroah-Hartman
---
drivers/char/virtio_console.c | 39 +++
1 files changed, 27 in
From: Masami Hiramatsu
Enable to use splice_write from pipe to virtio-console port.
This steals pages from pipe and directly send it to host.
Note that this may accelerate only the guest to host path.
Signed-off-by: Masami Hiramatsu
Cc: Amit Shah
Cc: Arnd Bergmann
Cc: Greg Kroah-Hartman
---
From: Masami Hiramatsu
Add a failback memcpy path for unstealable pipe buffer.
If buf->ops->steal() fails, virtio-serial tries to
copy the page contents to an allocated page, instead
of just failing splice().
Signed-off-by: Masami Hiramatsu
Cc: Amit Shah
Cc: Arnd Bergmann
Cc: Greg Kroah-Hartm
rtio/console: Add splice_write support
Yoshihiro YUNOMAE (1):
tools: Add guest trace agent as a user tool
drivers/char/virtio_console.c | 198 ++--
kernel/trace/trace.c|8 -
tools/virtio/virtio-trace/Makefile | 14 +
to
uffer like as ftrace and one ring-buffer one CPU will be
implemented near the future.
Signed-off-by: Yoshihiro YUNOMAE
Signed-off-by: Masami Hiramatsu
Signed-off-by: Akihiro Nagai
Cc: Greg Kroah-Hartman
Cc: Ohad Ben-Cohen
Cc: Linus Walleij
Cc: MyungJoo Ham
Cc: Rusty Russell
Cc: Joerg Roedel
(2012/06/05 22:10), Borislav Petkov wrote:
On Tue, Jun 05, 2012 at 10:01:17PM +0900, Yoshihiro YUNOMAE wrote:
This patch adds a ring-buffer driver for IVShmem device, a virtual RAM device in
QEMU. This driver can be used as a ring-buffer for kernel logging or tracing of
a guest OS by recording
uffer like as ftrace and one ring-buffer one CPU will be
implemented near the future.
Signed-off-by: Yoshihiro YUNOMAE
Signed-off-by: Masami Hiramatsu
Signed-off-by: Akihiro Nagai
Cc: Greg Kroah-Hartman
Cc: Ohad Ben-Cohen
Cc: Linus Walleij
Cc: MyungJoo Ham
Cc: Rusty Russell
Cc: Joerg Roedel
:
./ivring_reader -m 2 -f /tmp/log.txt -S 10 -N 2 -s /ivshmem
In this case, two log files are output as /tmp/log.txt.0 and /tmp/log.txt.1
whose sizes are 10MB.
Signed-off-by: Yoshihiro YUNOMAE
Signed-off-by: Masami Hiramatsu
Signed-off-by: Akihiro Nagai
Cc: Borislav Petkov
Cc: Arnaldo Carvalho de
el Tracing &
Tracing Across Host OS and Guest OS
Speakers: Yoshihiro Yunomae and Akihiro Nagai
You can download our slides about IVRing in the schedule page.
***Evaluation***
When a host collects tracing data of a guest, the performance of using IVRing
is compared with
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