Prepare the futex-based implementation of lock2 to maintain a list of
waiting Ms. Beyond storing an muintptr in the mutex's key field, we now
must never overwrite that field (even for a moment) without taking its
current value into account.
The semaphore-based implementation of lock2 already has that behavior.
Reuse that structure.
For #66999
Change-Id: I23b6f6bacb276fe33c6aed5c0571161a7e71fe6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/585636
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Move the nextwaitm field into a small struct, in preparation for
additional metadata to track how long Ms need to wait for locks.
For #66999
Change-Id: Ib40e43c15cde22f7e35922641107973d99439ecd
Reviewed-on: https://go-review.googlesource.com/c/go/+/585635
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
For #46477.
Change-Id: Ia3558f9d2bf43fdd9e3618bd9f800d268e13b367
Reviewed-on: https://go-review.googlesource.com/c/go/+/586956
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
This is a continuation of CL 570036.
Amend FindProcess to use pidfdFind, and make it return a special
Process with Pid of pidDone (-2) if the process is not found.
Amend Wait and Signal to return ErrProcessDone if pid == pidDone.
The alternative to the above would be to make FindProcess return
ErrProcessDone, but this is unexpected and incompatible API change,
as discussed in #65866 and #51246.
For #62654.
Rework of CL 542699 (which got reverted in CL 566476).
Change-Id: Ifb4cd3ad1433152fd72ee685d0b85d20377f8723
Reviewed-on: https://go-review.googlesource.com/c/go/+/570681
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Allow users to decrease the profiling stack depth back to 32 in case
they experience any problems with the new default of 128.
Users may also use this option to increase the depth up to 1024.
Change-Id: Ieaab2513024915a223239278dd97a6e161dde1cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/581917
Reviewed-by: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The current stack depth limit for alloc, mutex, block, threadcreate and
goroutine profiles of 32 frequently leads to truncated stack traces in
production applications. Increase the limit to 128 which is the same
size used by the execution tracer.
Create internal/profilerecord to define variants of the runtime's
StackRecord, MemProfileRecord and BlockProfileRecord types that can hold
arbitrarily big stack traces. Implement internal profiling APIs based on
these new types and use them for creating protobuf profiles and to act
as shims for the public profiling APIs using the old types.
This will lead to an increase in memory usage for applications that
use the impacted profile types and have stack traces exceeding the
current limit of 32. Those applications will also experience a slight
increase in CPU usage, but this will hopefully soon be mitigated via CL
540476 and 533258 which introduce frame pointer unwinding for the
relevant profile types.
For #43669.
Change-Id: Ie53762e65d0f6295f5d4c7d3c87172d5a052164e
Reviewed-on: https://go-review.googlesource.com/c/go/+/572396
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Previously it was possible for mutex and block profile stack traces to
contain up to 32 frames in Stack0 or the resulting pprof profiles.
CL 533258 changed this behavior by using some of the space to
record skipped frames that are discarded when performing delayed inline
expansion. This has lowered the effective maximum stack size from 32 to
27 (the max skip value is 5), which can be seen as a small regression.
Add TestProfilerStackDepth to demonstrate the issue and protect all
profile types from similar regressions in the future. Fix the issue by
increasing the internal maxStack limit to take the maxSkip value into
account. Assert that the maxSkip value is never exceeded when recording
mutex and block profile stack traces.
Three alternative solutions to the problem were considered and
discarded:
1) Revert CL 533258 and give up on frame pointer unwinding. This seems
unappealing as we would lose the performance benefits of frame
pointer unwinding.
2) Discard skipped frames when recording the initial stack trace. This
would require eager inline expansion for up to maxSkip frames and
partially negate the performance benefits of frame pointer
unwinding.
3) Accept and document the new behavior. This would simplify the
implementation, but seems more confusing from a user perspective. It
also complicates the creation of test cases that make assertions
about the maximum profiling stack depth.
The execution tracer still has the same issue due to CL 463835. This
should be addressed in a follow-up CL.
Co-authored-by: Nick Ripley <nick.ripley@datadoghq.com>
Change-Id: Ibf4dbf08a5166c9cb32470068c69f58bc5f98d2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/586657
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
CL 577935 enabled hot block alignment on 386
and amd64 architecture.
However, this change broke the plan9/386 build.
This change disables AlignHot on plan9/386.
Updates #67502.
Change-Id: If73b066824c7218a9408c6e8f06aec5908b7a64f
Reviewed-on: https://go-review.googlesource.com/c/go/+/586835
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David du Colombier <0intro@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This is for the proposal, plus a few bug fixes
that would/will be necessary when this is put into
actual use.
Fixes#66408.
Updates #63131.
Change-Id: I3a66e09d707dd579c59f155e7f53367f41214c30
Reviewed-on: https://go-review.googlesource.com/c/go/+/578355
Reviewed-by: Austin Clements <austin@google.com>
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Auto-Submit: David Chase <drchase@google.com>
Commands run
go get golang.org/x/telemetry@bf80d56
go mod tidy
go mod vendor
Pulls in CL 586195 and CL 586098
Change-Id: I21ba2ddce0e9c355e9f1c06961ba6cba5475375c
Reviewed-on: https://go-review.googlesource.com/c/go/+/586877
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Matloob <matloob@golang.org>
Factor out file base computation into a method.
Change-Id: Ia6de100459b6df2919f2320872890320aa88866d
Reviewed-on: https://go-review.googlesource.com/c/go/+/586156
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Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
The posBaseMap is used to identify a file's syntax tree node
given a source position. The position is mapped to the file
base which is then used to look up the file node in posBaseMap.
When posBaseMap is initialized, the file position base
is not the file base if there's a line directive before
the package clause. This can happen in cgo-generated files,
for instance due to an import "C" declaration.
If the wrong file position base is used during initialization,
looking up a file given a position will not find the file.
If a version error occurs and the corresponding file is
not found, the old code panicked with a null pointer exception.
Make sure to consistently initialize the posBaseMap by factoring
out the code computing the file base from a given position.
While at it, check for a nil file pointer. This should not happen
anymore, but don't crash if it happens (at the cost of a slightly
less informative error message).
Fixes#67141.
Change-Id: I4a6af88699c32ad01fffce124b06bb7f9e06f43d
Reviewed-on: https://go-review.googlesource.com/c/go/+/586238
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Auto-Submit: Robert Griesemer <gri@google.com>
This is for the changes in CL 577935.
Change-Id: I8f70dd36c89aaede11a37744c0f279439e01eb13
Reviewed-on: https://go-review.googlesource.com/c/go/+/586895
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Use stringslite and bytealg to simplify the code and to remove redundent
helper functions.
Change-Id: I665a8313d9b91201b147b255290058f162cf0894
GitHub-Last-Rev: e9e3bebdb4
GitHub-Pull-Request: golang/go#67515
Reviewed-on: https://go-review.googlesource.com/c/go/+/586715
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Carlos Amedee <carlos@golang.org>
Refactor compare function to use cmp.Compare for various types.
Remove redundant floatCompare and isNaN functions.
Change-Id: I146a7af9158538499d07daee930aad8cf89b7e8f
GitHub-Last-Rev: d98365c044
GitHub-Pull-Request: golang/go#67454
Reviewed-on: https://go-review.googlesource.com/c/go/+/586239
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Size() is currently not called from the fast path, since the package
handles the buffer sizing for Read and Write internally. This will change
when adding Append() because callers can use Size to avoid allocations when
writing into bytes.Buffer via AvailableBuffer for example.
Add a fast path for simple types and extend the existing struct size cache
to arrays of structs.
Change-Id: I3af16a2b6c9e2dbe6166a2f8c96bcd2e936719e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/584358
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@google.com>
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Auto-Submit: Austin Clements <austin@google.com>
For #58894
Change-Id: Ia30a3a1a9c7b611f55701956c08caa967634cd5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/586138
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Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Avoid downloading modules into a modcache in the GOROOT directory. That
creates read only files in GOROOT, which is undesirable.
Fixes#67463
Change-Id: I6d10c605be5eba967648d823ee8fc915716b4b5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/586078
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Change-Id: If9e3c5a58726ae3628d2e835d71f1a4708594c11
Reviewed-on: https://go-review.googlesource.com/c/go/+/586575
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Replacing Branch Conditional (BC) with its extended mnemonic form of BDNZ and BDZ.
- BC 16, 0, target can be replaced by BDNZ target
- BC 18, 0, target can be replaced by BDZ target
Change-Id: I1259e207f2a40d0b72780d5421f7449ddc006dc5
Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10,gotip-linux-ppc64_power8,gotip-linux-ppc64le_power8,gotip-linux-ppc64le_power9,gotip-linux-ppc64le_power10
Reviewed-on: https://go-review.googlesource.com/c/go/+/585077
Reviewed-by: Carlos Amedee <carlos@golang.org>
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Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Doing that appears to have been a mistake in CL 142883.
Fixes#67517
Change-Id: Iec6b897984a2e27ec596fc3c4c8129e9620afab1
Reviewed-on: https://go-review.googlesource.com/c/go/+/586676
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Reviewed-by: Russ Cox <rsc@golang.org>
For #67475
Change-Id: Ia90952eb7c19764306205928ead50bff22857378
Reviewed-on: https://go-review.googlesource.com/c/go/+/586675
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Change-Id: I5595206674170351691b1d9869356db654f20ebb
GitHub-Last-Rev: bc0d4d13f6
GitHub-Pull-Request: golang/go#67464
Reviewed-on: https://go-review.googlesource.com/c/go/+/586159
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
In dynamic linking mode (e.g. when using plugins) on darwin, the
marker symbols runtime.text and runtime.etext are added to Textp
in an early stage, so when adding symbols to the symbol table we
don't need to explicitly add them. However, when splitting text
sections, the runtime.text.N marker symbols for the addtional
sections are not added to Textp. So we do need to add them
explicitly to the symbol table.
Fixes#66993.
Change-Id: Ic718d03cd71fc0bfb931cff82640b1f4c53b89be
Reviewed-on: https://go-review.googlesource.com/c/go/+/586555
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
A follow-up for the CL 585015.
Change-Id: I412f33f1d75abe1446cb3fd742d44d3cb4350380
GitHub-Last-Rev: 554ace757c
GitHub-Pull-Request: golang/go#67476
Reviewed-on: https://go-review.googlesource.com/c/go/+/586240
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Change-Id: I9611edb9663a9c32bb23d26b9b22b79a54a97498
Reviewed-on: https://go-review.googlesource.com/c/go/+/586196
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
- Replace manual string suffix removal with stringslite.TrimSuffix in conf.go
- Use stringslite.Cut for string splitting in ParseCIDR function in ip.go
- Add stringslite import in ip.go
This change simplifies string operations and improves code readability.
Change-Id: I02c238d0bc91e95789d8060e6ef4c7d4f6e3f0d9
GitHub-Last-Rev: aef5dc5011
GitHub-Pull-Request: golang/go#67461
Reviewed-on: https://go-review.googlesource.com/c/go/+/586157
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
The assembler should pack 3 argument usage of FCMPO similar
to other CMP-like opcodes.
Fixes#67359
Change-Id: Icfb42a67d741431a70dd880806857b4c38f42d62
Reviewed-on: https://go-review.googlesource.com/c/go/+/585640
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
CL 544455, which added atomic And/Or APIs, raced with CL 585556, which
enabled stricter linkname checking. This caused linkname-related
failures on ARM and MIPS. Fix this by adding the necessary linknames.
We fix one other linkname that got overlooked in CL 585556.
Updates #61395.
Change-Id: I454f0767ce28188e550a61bc39b7e398239bc10e
Reviewed-on: https://go-review.googlesource.com/c/go/+/586516
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
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Auto-Submit: Austin Clements <austin@google.com>
This change fixes problems with thread-locked goroutines using
newcoro/coroswitch/etc. Currently, the coro paths do not consider
thread-locked goroutines at all and can quickly result in broken
scheduler state or lost/leaked goroutines.
One possible fix to these issues is to fall back on goroutine+channel
semantics, but that turns out to be fairly complicated to implement and
results in significant performance cliffs. More complex thread-lock
state donation tricks also result in some fairly complicated state
tracking that doesn't seem worth it given the use-cases of iter.Pull
(and even then, there will be performance cliffs).
This change implements a much simpler, but more restrictive semantics.
In particular, thread-lock state is tied to the coro at the first call
to newcoro (i.e. iter.Pull). From then on, the invariant is that if the
coro has any thread-lock state *or* a goroutine calling into coroswitch
has any thread-lock state, that the full gamut of thread-lock state must
remain the same as it was when newcoro was called (the full gamut
meaning internal and external lock counts as well as the identity of the
thread that was locked to).
This semantics allows the common cases to be always fast, but comes with
a non-orthogonality caveat. Specifically, when iter.Pull is used in
conjunction with thread-locked goroutines, complex cases (passing next
between goroutines or passing yield between goroutines) are likely to
fail. Simple cases, where any number of iter.Pull iterators are used in
a straightforward way (nested, in series, etc.) from the same
goroutine, will work and will be guaranteed to be fast regardless of
thread-lock state.
This is a compromise for the near-term and we may consider lifting the
restrictions imposed by this CL in the future.
Fixes#65889.
Fixes#65946.
Change-Id: I3fb5791e36a61f5ded50226a229a79d28739b24e
Reviewed-on: https://go-review.googlesource.com/c/go/+/583675
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This change moves the v2 tracer into the trace directory.
Updates #67367
Change-Id: I3657b4227002cb00fdf29c797434800ea796715e
Reviewed-on: https://go-review.googlesource.com/c/go/+/584538
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This CL implements the new sync/atomic AND and OR apis as well as their race
counterparts.
Fixes#61395
Change-Id: I294eefe4b3ac27bc4ed237edcbfa88a8c646d86f
GitHub-Last-Rev: f174297007
GitHub-Pull-Request: golang/go#64331
Reviewed-on: https://go-review.googlesource.com/c/go/+/544455
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Austin Clements <austin@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
This change removes unused parts of the v1 tracer in preperation of
the move of the v2 tracer into the trace package.
Updates #67367
Change-Id: I3e53a8afdef72dc90c2d5b514380d1077d284bc7
Reviewed-on: https://go-review.googlesource.com/c/go/+/584537
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
CL 586095 wasn't needed because setting the GODEBUG value was just moved
lower in CL 563137. Now we set it twice. Remove the second set so that
it's only set once.
Change-Id: I4a830977833b007e996d0ccaec705a1da4631e6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/586477
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This change removes the old trace code and replaces it with the new tracer.
It does the following:
- Moves the contents of the v2 directory into the parent trace directory.
- Combines the old tracer main file with the new main file.
- Replaces any existing files with the corresponding v2 files.
- Removes any unused files.
Updates #67367
Change-Id: I2237920e13588258a2442b639d562cf7f8a8e944
Reviewed-on: https://go-review.googlesource.com/c/go/+/584536
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
CL 585358 adds restrictions to disallow pull-only linknames
(currently off by default). Currently, there are quite some pull-
only linknames in user code in the wild. In order not to break
those, we add push linknames to allow them to be pulled. This CL
includes linknames found in a large code corpus (thanks Matthew
Dempsky and Michael Pratt for the analysis!), that are not
currently linknamed.
Updates #67401.
Change-Id: I32f5fc0c7a6abbd7a11359a025cfa2bf458fe767
Reviewed-on: https://go-review.googlesource.com/c/go/+/586137
Reviewed-by: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Port CL 577616 from types2 to go/types allows us
to re-enable these tests.
Fixes#66859.
Fixes#67436.
Updates #50259.
Updates #65294.
Change-Id: I573e51cf16546ac1c115beac5322b51dd998c881
Reviewed-on: https://go-review.googlesource.com/c/go/+/586236
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
CL 546676 inadvertently changed the error returned when reading
from the body of a canceled request. Fix it.
Rework various request cancelation tests to exercise all three ways
of canceling a request.
Fixes#67439
Change-Id: I14ecaf8bff9452eca4a05df923d57d768127a90c
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-linux-amd64-longtest-race
Reviewed-on: https://go-review.googlesource.com/c/go/+/586315
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Avoid creating duplicate usages of ANDCCconst. This is preparation for
a patch to reintroduce ANDconst to simplify the lower pass while
treating ANDCCconst like other *CC* ssa opcodes.
Also, move many of the similar rules wich retarget ANDCCconst users
to the flag result to a common rule for all compares against zero.
Change-Id: Ida86efe17ff413cb82c349d8ef69d2899361f4c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/585400
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Use Process.handle field to store pidfd, and make use of it. Only use
pidfd functionality if all the needed syscalls are available.
1. Add/use pidfdWorks, which checks that all needed pidfd-related
functionality works.
2. os.StartProcess: obtain the pidfd from the kernel, if possible, using
the functionality added by CL 520266. Note we could not modify
syscall.StartProcess to return pidfd directly because it is a public
API and its callers do not expect it, so we have to use ensurePidfd
and getPidfd.
3. (*Process).Kill: use pidfdSendSignal, if available and the pidfd is
known. Otherwise, fall back to the old implementation.
4. (*Process).Wait: use pidfdWait, if available, otherwise fall back to
using waitid/wait4. This is more complicated than expected due to
struct siginfo_t idiosyncrasy.
NOTE pidfdSendSignal and pidfdWait are used without a race workaround
(blockUntilWaitable and sigMu, added by CL 23967) because with pidfd,
PID recycle issue doesn't exist (IOW, pidfd, unlike PID, is guaranteed
to refer to one particular process) and thus the race doesn't exist
either.
Rework of CL 528438 (reverted in CL 566477 because of #65857).
For #62654.
Updates #13987.
Change-Id: If5ef8920bd8619dc428b6282ffe4fb8c258ca224
Reviewed-on: https://go-review.googlesource.com/c/go/+/570036
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
