delta/go-git.git/src/runtime/trace, branch dev.debug

runtime/trace: better output when test fails

2017-04-14T12:21:02+00:00

Change-Id: I108d15eb4cd25904bb76de4ed7548c039c69d1a3
Reviewed-on: https://go-review.googlesource.com/40590
Run-TryBot: David Lazar 
TryBot-Result: Gobot Gobot 
Reviewed-by: Austin Clements

os: use poller for file I/O

2017-02-15T19:31:55+00:00

This changes the os package to use the runtime poller for file I/O
where possible. When a system call blocks on a pollable descriptor,
the goroutine will be blocked on the poller but the thread will be
released to run other goroutines. When using a non-pollable
descriptor, the os package will continue to use thread-blocking system
calls as before.

For example, on GNU/Linux, the runtime poller uses epoll. epoll does
not support ordinary disk files, so they will continue to use blocking
I/O as before. The poller will be used for pipes.

Since this means that the poller is used for many more programs, this
modifies the runtime to only block waiting for the poller if there is
some goroutine that is waiting on the poller. Otherwise, there is no
point, as the poller will never make any goroutine ready. This
preserves the runtime's current simple deadlock detection.

This seems to crash FreeBSD systems, so it is disabled on FreeBSD.
This is issue 19093.

Using the poller on Windows requires opening the file with
FILE_FLAG_OVERLAPPED. We should only do that if we can remove that
flag if the program calls the Fd method. This is issue 19098.

Update #6817.
Update #7903.
Update #15021.
Update #18507.
Update #19093.
Update #19098.

Change-Id: Ia5197dcefa7c6fbcca97d19a6f8621b2abcbb1fe
Reviewed-on: https://go-review.googlesource.com/36800
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot 
Reviewed-by: Russ Cox

net: refactor poller into new internal/poll package

2017-02-13T18:36:28+00:00

This will make it possible to use the poller with the os package.

This is a lot of code movement but the behavior is intended to be
unchanged.

Update #6817.
Update #7903.
Update #15021.
Update #18507.

Change-Id: I1413685928017c32df5654ded73a2643820977ae
Reviewed-on: https://go-review.googlesource.com/36799
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot 
Reviewed-by: David Crawshaw 
Reviewed-by: Russ Cox

cmd/compile/internal/syntax: removed gcCompat code needed to pass orig. tests

2017-02-10T01:22:30+00:00

The gcCompat mode was introduced to match the new parser's node position
setup exactly with the positions used by the original parser. Some of the
gcCompat adjustments were required to satisfy syntax error test cases,
and the rest were required to make toolstash cmp pass.

This change removes the former gcCompat adjustments and instead adjusts
the respective test cases as necessary. In some cases this makes the error
lines consistent with the ones reported by gccgo.

Where it has changed, the position associated with a given syntactic construct
is the position (line/col number) of the left-most token belonging to the
construct.

Change-Id: I5b60c00c5999a895c4d6d6e9b383c6405ccf725c
Reviewed-on: https://go-review.googlesource.com/36695
Run-TryBot: Robert Griesemer 
TryBot-Result: Gobot Gobot 
Reviewed-by: Matthew Dempsky

all: don't call t.Fatal from a goroutine

2016-11-15T15:13:48+00:00

Fixes #17900.

Change-Id: I42cda6ac9cf48ed739d3a015a90b3cb15edf8ddf
Reviewed-on: https://go-review.googlesource.com/33243
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot 
Reviewed-by: Brad Fitzpatrick

runtime/trace: deflake TestTraceSymbolize

2016-10-28T19:32:37+00:00

Waiting 2ms for all the kicked-off goroutines to run and block
seems a little optimistic. No harm done by waiting for 200ms instead.

Fixes #17238.

Change-Id: I827532ea2f5f1f3ed04179f8957dd2c563946ed0
Reviewed-on: https://go-review.googlesource.com/32103
Run-TryBot: Russ Cox 
Reviewed-by: Ian Lance Taylor

runtime/trace, internal/trace: script to collect canned traces

2016-10-28T17:46:49+00:00

This adds support to the runtime/trace test for saving traces
collected by its tests to disk and a script in internal/trace that
uses this to collect canned traces for the trace test suite. This can
be used to add to the test suite when we introduce a new trace format
version.

Change-Id: Id9ac1ff312235bf02f982fdfff8a827f54035758
Reviewed-on: https://go-review.googlesource.com/32290
Run-TryBot: Austin Clements 
TryBot-Result: Gobot Gobot 
Reviewed-by: Dmitry Vyukov

runtime/trace: test detection of broken timestamps

2016-04-24T09:11:37+00:00

On some processors cputicks (used to generate trace timestamps)
produce non-monotonic timestamps. It is important that the parser
distinguishes logically inconsistent traces (e.g. missing, excessive
or misordered events) from broken timestamps. The former is a bug
in tracer, the latter is a machine issue.

Test that (1) parser does not return a logical error in case of
broken timestamps and (2) broken timestamps are eventually detected
and reported.

Change-Id: Ib4b1eb43ce128b268e754400ed8b5e8def04bd78
Reviewed-on: https://go-review.googlesource.com/21608
Reviewed-by: Austin Clements

internal/trace: support parsing of 1.5 traces

2016-04-11T17:56:44+00:00

1. Parse out version from trace header.
2. Restore handling of 1.5 traces.
3. Restore optional symbolization of traces.
4. Add some canned 1.5 traces for regression testing
   (http benchmark trace, runtime/trace stress traces,
    plus one with broken timestamps).

Change-Id: Idb18a001d03ded8e13c2730eeeb37c5836e31256
Reviewed-on: https://go-review.googlesource.com/21803
Run-TryBot: Dmitry Vyukov 
TryBot-Result: Gobot Gobot 
Reviewed-by: Austin Clements

runtime: emit file:line info into traces

2016-04-08T20:52:30+00:00

This makes traces self-contained and simplifies trace workflow
in modern cloud environments where it is simpler to reach
a service via HTTP than to obtain the binary.

Change-Id: I6ff3ca694dc698270f1e29da37d5efaf4e843a0d
Reviewed-on: https://go-review.googlesource.com/21732
Run-TryBot: Dmitry Vyukov 
TryBot-Result: Gobot Gobot 
Reviewed-by: Hyang-Ah Hana Kim