For memmove/memclr using jump tables only reduces overall
function performance for both amd64 and 386.
Benchmarks for 32-bit memclr:
name old time/op new time/op delta
Memclr/5-8 8.01ns ± 0% 8.94ns ± 2% +11.59% (p=0.000 n=9+9)
Memclr/16-8 9.05ns ± 0% 9.49ns ± 0% +4.81% (p=0.000 n=8+8)
Memclr/64-8 9.15ns ± 0% 9.49ns ± 0% +3.76% (p=0.000 n=9+10)
Memclr/256-8 16.6ns ± 0% 16.6ns ± 0% ~ (p=1.140 n=10+9)
Memclr/4096-8 179ns ± 0% 166ns ± 0% -7.26% (p=0.000 n=9+8)
Memclr/65536-8 3.36µs ± 1% 3.31µs ± 1% -1.48% (p=0.000 n=10+9)
Memclr/1M-8 59.5µs ± 3% 60.5µs ± 2% +1.67% (p=0.009 n=10+10)
Memclr/4M-8 239µs ± 3% 245µs ± 0% +2.49% (p=0.004 n=10+8)
Memclr/8M-8 618µs ± 2% 614µs ± 1% ~ (p=0.315 n=10+8)
Memclr/16M-8 1.49ms ± 2% 1.47ms ± 1% -1.11% (p=0.029 n=10+10)
Memclr/64M-8 7.06ms ± 1% 7.05ms ± 0% ~ (p=0.573 n=10+8)
[Geo mean] 3.36µs 3.39µs +1.14%
For less predictable data, like loop iteration dependant sizes,
branch table still shows 2-5% worse results.
It also makes code slightly more complicated.
This CL removes TODO note that directly suggest trying this
optimization out. That encourages people to spend their time
in a quite hopeless endeavour.
The code used to implement branch table used a 32/64-entry table
with pointers to TEXT blocks that implemented every associated
label work. Most last entries point to "loop" code that is
a fallthrough for all other sizes that do not map into specialized
routines. The only inefficiency is extra MOVL/MOVQ required
to fetch table pointer itself as MOVL $sym<>(SB)(AX*4) is not valid
in Go asm (it works in other assemblers):
TEXT ·memclrNew(SB), NOSPLIT, $0-8
MOVL ptr+0(FP), DI
MOVL n+4(FP), BX
// Handle 0 separately.
TESTL BX, BX
JEQ _0
LEAL -1(BX), CX // n-1
BSRL CX, CX
// AX or X0 zeroed inside every text block.
MOVL $memclrTable<>(SB), AX
JMP (AX)(CX*4)
_0:
RET
Change-Id: I4f706931b8127f85a8439b95834d5c2485a5d1bf
Reviewed-on: https://go-review.googlesource.com/115678
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This adds the support to enable the race detector for ppc64le.
Added runtime/race_ppc64le.s to manage the calls from Go to the
LLVM tsan functions, mostly converting from the Go ABI to the
PPC64 ABI expected by Clang generated code.
Changed racewalk.go to call racefuncenterfp instead of racefuncenter
on ppc64le to allow the caller pc to be obtained in the asm code
before calling the tsan version.
Changed the set up code for racecallbackthunk so it doesn't use
the autogenerated save and restore of the link register since that
sequence uses registers inconsistent with the normal ppc64 ABI.
Made various changes to recognize that race is supported for
ppc64le.
Ensured that tls_g is updated and accessible from race_linux_ppc64le.s
so that the race ctx can be obtained and passed to tsan functions.
This enables the race tests for ppc64le in cmd/dist/test.go and
increases the timeout when running the benchmarks with the -race
option to avoid timing out.
Updates #24354, #23731
Change-Id: Ib97dc7ac313e6313c836dc7d2fb698f9d8fba3ef
Reviewed-on: https://go-review.googlesource.com/107935
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
When using plugins with goroutines calling cgo, we hit a case where
an intermittent SIGSEGV occurs when referencing an address that is based
on r2 (TOC address). When the failure can be generated in gdb, the
contents of r2 is wrong even though the value in the current stack's
slot for r2 is correct. So that means it somehow switched to start
running the code in this function without passing through the beginning
of the function which had the correct value of r2 and stored it there.
It was noted that in runtime.gogo when the state is restored from
gobuf, r2 is not restored from its slot on the stack. Adding the
instruction to restore r2 prevents the SIGSEGV.
This adds a testcase under testplugin which reproduces the problem if
the program is run multiple times. The team who reported this problem
has verified it fixes the issue on their larger, more complex
application.
Fixes#25756
Change-Id: I6028b6f1f8775d5c23f4ebb57ae273330a28eb8f
Reviewed-on: https://go-review.googlesource.com/117515
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
On 32-bit architectures without native 64-bit atomic instructions,
64-bit atomics are emulated using spinlocks. However,
the sigprof handling code expects to be able to perform
64-bit atomic operations in signal handlers. Spinning on an
acquired spinlock in a signal handler leads to a livelock.
This is issue #20146.
The original fix for #20146 did not include arm in
the list of architectures that need to work around portability
issues in the sigprof handler code. The unit test designed to
catch this issue does not fail on arm builds because arm uses
striped spinlocks, and thus the livelock takes many minutes
to reproduce. This is issue #24260. (This patch doesn't completely
fix#24260 on go1.10.2 due to issue #25785, which is probably
related to the arm cas kernel helpers. Those have been removed
at tip.)
With this patch applied, I was able to run the reproducer for
issue #24260 for more than 90 minutes without reproducing the
livelock. Without this patch, the livelock took as little as
8 minutes to reproduce.
Fixes#20146
Updates #24260
Change-Id: I64bf53a14d53c4932367d919ac55e17c99d87484
Reviewed-on: https://go-review.googlesource.com/117057
Run-TryBot: Philip Hofer <phofer@umich.edu>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
They are unused since CL 114799.
Also remove consts _CTL_KERN and _KERN_OSRELEASE previously used by
getDarwinVersion.
Change-Id: I51b701e8effbe4dd4301b0e6d52e8885469032f4
Reviewed-on: https://go-review.googlesource.com/116955
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This line of the inlining tuning experiment
https://go-review.googlesource.com/c/go/+/109918/1/src/cmd/compile/internal/gc/inl.go#347
was incorrectly rewritten in a later patch to use the call
cost, not the panic cost, and thus the inlining of panic
didn't occur when it should. I discovered this when I
realized that tests should have failed, but didn't.
Fix is to make the correct change, and also to modify the
tests that this causes to fail. One test now asserts the
new normal, the other calls "ppanic" instead which is
designed to behave like panic but not be inlined.
Change-Id: I423bb7f08bd66a70d999826dd9b87027abf34cdf
Reviewed-on: https://go-review.googlesource.com/116656
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Adds an extra M in mstartm0 and accounts for it in checkdead. This allows Windows callbacks created with syscall.NewCallback and syscall.NewCallbackCDecl to be called on a non-Go thread.
Fixes#6751
Change-Id: I57626bc009a6370b9ca0827ab64b14b01dec39d4
GitHub-Last-Rev: d429e3eed9
GitHub-Pull-Request: golang/go#25575
Reviewed-on: https://go-review.googlesource.com/114802
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If we run into data corruption due to the program accessing timers in
a racy way, do a normal panic rather than a hard crash with "panic
holding locks". The hope is to make the problem less confusing for users.
Fixes#25686
Change-Id: I863417adf21f7f8c088675b67a3acf49a0cdef41
Reviewed-on: https://go-review.googlesource.com/115815
Reviewed-by: Austin Clements <austin@google.com>
This commit adds the js/wasm architecture to the net package.
The net package is not supported by js/wasm, but a simple fake
networking is available so tests of other packages that require
basic TCP sockets can pass. The tests of the net package itself
are mostly disabled.
Updates #18892
Change-Id: Id287200c39f0a3e23d20ef17260ca15ccdcca032
Reviewed-on: https://go-review.googlesource.com/109995
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
These were generated using the racebuild configuration from
https://golang.org/cl/115375, with the LLVM compiler-rt repository at
commit fe2c72c59aa7f4afa45e3f65a5d16a374b6cce26 for most platforms.
The Windows build is from an older compiler-rt revision, because the
compiler-rt build script for the Go race detector has been broken
since January 2017 (https://reviews.llvm.org/D28596).
Updates #24354.
Change-Id: Ica05a5d0545de61172f52ab97e7f8f57fb73dbfd
Reviewed-on: https://go-review.googlesource.com/112896
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Each URL was manually verified to ensure it did not serve up incorrect
content.
Change-Id: I4dc846227af95a73ee9a3074d0c379ff0fa955df
Reviewed-on: https://go-review.googlesource.com/115798
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
This is a documentation error.
Change-Id: I083021f151f7e80a0b9083b98452ae1f5920640d
Reviewed-on: https://go-review.googlesource.com/115598
Reviewed-by: Peter Weinberger <pjw@google.com>
This commit adds the js/wasm architecture to the os package.
Access to the actual file system is supported through Node.js.
Updates #18892
Change-Id: I6fa642fb294ca020b2c545649d4324d981aa0408
Reviewed-on: https://go-review.googlesource.com/109977
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The profiler reports "ExternalCode" when a profiler interrupt happens
while in libc code. Instead, keep track of the most recent Go frame
for the profiler to use.
There is a test for this using time.Now (runtime.TestTimePprof),
which will work once time.Now is moved to using libc (my next CL).
Change-Id: I940ea83edada482a482e2ab103d3a65589979464
Reviewed-on: https://go-review.googlesource.com/114798
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In golang.org/cl/102355 I mistakenly used 26 instead of 25 as the AT_HWCAP value.
26 is AT_HWCAP2. While experimenting with FreeBSD-11.2-BETA3 (where both values are
being supplied in the auxv), the AT_HWCAP2 value read is 0 which triggers the error again:
runtime: this CPU has no floating point hardware, so it cannot run this GOARM=7 binary. Recompile using GOARM=5.
Updates #24507.
Change-Id: Ide04b7365d8f10e4650edf4e188dd58bdf42cc26
Reviewed-on: https://go-review.googlesource.com/114822
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This also allows the GODEBUGCPU options to change the
support_* runtime cpu feature variable values.
Change-Id: I884c5f03993afc7e3344ff2fd471a2c6cfde43d4
Reviewed-on: https://go-review.googlesource.com/114615
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TestMutexProfile and TestEmptyCallStack couldn't run multiple times
because they mutate state in runtime (mutex profile counters and
a user-defined profile type) and test whether the state
matches what it is supposed to be after the very first run.
We fix TestMutexProfile by relaxing the expected state condition.
We fix TestEmptyCallStack by creating a new profile with a different
name every time the test runs.
For #25520
Change-Id: I8e50cd9526eb650c8989457495ff90a24ce07863
Reviewed-on: https://go-review.googlesource.com/114495
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TestDebugCall* uses atomic spin loops and hence can deadlock if the
garbage collector is enabled (because of #10958; ironically,
implementing debugger call injection is closely related to fixing this
exact issue, but we're not there yet).
Fix this by disabling the garbage collector during these tests.
Updates #25519 (might fix it, though I suspect not)
Change-Id: If1e454b9cdea8e4b1cd82509b762c75b6acd8476
Reviewed-on: https://go-review.googlesource.com/114086
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Traceback matches the defer stack with the function call stack using
the SP recorded in defer frames when the defer frame is created.
However, on LR machines this is ambiguous: if function A pushes a
defer and then calls function B, where B is a leaf function with a
zero-sized frame, then both A and B have the same SP and will *both*
match the defer on the defer stack. Since traceback unwinds through B
first, it will incorrectly match up the defer with B's frame instead
of A's frame.
Where this goes particularly wrong is if function B causes a signal
that turns into a panic (e.g., a nil pointer dereference). In order to
handle the fact that we may not have a liveness map at the location
that caused the signal and injected a sigpanic call, traceback has
logic to unwind the panicking frame's continuation PC to the PC where
the most recent defer was pushed (this is safe because the frame is
dead other than any defers it pushed). However, if traceback
mis-matches the defer stack, it winds up reporting the B's
continuation PC is in A. If the runtime then uses this continuation PC
to look up PCDATA in B, it will panic because the PC is out of range
for B. This failure mode can be seen in
sync/atomic/atomic_test.go:TestNilDeref. An example failure is:
https://build.golang.org/log/8e07a762487839252af902355f6b1379dbd463c5
This CL fixes all of this by recognizing that a function that pushes a
defer must also have a non-zero-sized frame and using this fact to
refine the defer matching logic.
Fixes the build for arm64, mips, mipsle, ppc64, ppc64le, and s390x.
Fixes#25499.
Change-Id: Iff7c01d08ad42f3de22b3a73658cc2f674900101
Reviewed-on: https://go-review.googlesource.com/114078
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Needs the go compiler to be build with GOEXPERIMENT=debugcpu to be active.
The GODEBUGCPU environment variable can be used to disable usage of
specific processor features in the Go standard library.
This is useful for testing and benchmarking different code paths that
are guarded by internal/cpu variable checks.
Use of processor features can not be enabled through GODEBUGCPU.
To disable usage of AVX and SSE41 cpu features on GOARCH amd64 use:
GODEBUGCPU=avx=0,sse41=0
The special "all" option can be used to disable all options:
GODEBUGCPU=all=0
Updates #12805
Updates #15403
Change-Id: I699c2e6f74d98472b6fb4b1e5ffbf29b15697aab
Reviewed-on: https://go-review.googlesource.com/91737
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This adds a mechanism for debuggers to safely inject calls to Go
functions on amd64. Debuggers must participate in a protocol with the
runtime, and need to know how to lay out a call frame, but the runtime
support takes care of the details of handling live pointers in
registers, stack growth, and detecting the trickier conditions when it
is unsafe to inject a user function call.
Fixes#21678.
Updates derekparker/delve#119.
Change-Id: I56d8ca67700f1f77e19d89e7fc92ab337b228834
Reviewed-on: https://go-review.googlesource.com/109699
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Now that raise on darwin targets the current thread, we can remove
the workaround in dieFromSignal.
Change-Id: I1e468dc05e49403ee0bbe0a3a85e764c81fec4f2
Reviewed-on: https://go-review.googlesource.com/110476
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This CL is the darwin/arm and darwin/arm64 equivalent to CL 108679,
110215, 110437, 110438, 111258, 110655.
Updates #17490
Change-Id: Ia95b27b38f9c3535012c566f17a44b4ed26b9db6
Reviewed-on: https://go-review.googlesource.com/111015
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
pthread_self and pthread_kill are not safe to call from a signal
handler. In particular, pthread_self fails in iOS when called from
a signal handler context.
Use raise instead; it is signal handler safe and simpler.
Change-Id: I0cbfe25151aed245f55d7b76719ce06dc78c6a75
Reviewed-on: https://go-review.googlesource.com/113877
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When an object spans heap arenas, its bitmap is discontiguous, so
heapBitsSetType unrolls the bitmap into the object itself and then
copies it out to the real heap bitmap. Unfortunately, since this code
path is rare, it had two unnoticed bugs related to the head and tail
of the bitmap:
1. At the head of the object, we were using hbitp as the destination
bitmap pointer rather than h.bitp, but hbitp points into the
*temporary* bitmap space (that is, the object itself), so we were
failing to copy the partial bitmap byte at the head of an object.
2. The core copying loop copied all of the full bitmap bytes, but
always drove the remaining word count down to 0, even if there was a
partial bitmap byte for the tail of the object. As a result, we never
wrote partial bitmap bytes at the tail of an object.
I found these by enabling out-of-place unrolling all the time. To
improve our chances of detecting these sorts of bugs in the future,
this CL mimics this by enabling out-of-place mode 50% of the time when
doubleCheck is enabled so that we test both in-place and out-of-place
mode.
Change-Id: I69e5d829fb3444be4cf11f4c6d8462c26dc467e8
Reviewed-on: https://go-review.googlesource.com/110995
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
The function signatures in the comments used a C-like style. Using
Go function signatures is cleaner.
Change-Id: I1a093ed8fe5df59f3697c613cf3fce58bba4f5c1
Reviewed-on: https://go-review.googlesource.com/113876
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Use mach_absolute_time and mach_timebase_info to get nanosecond-level
timing information from libc on Darwin.
The conversion code from Apple's arbitrary time unit to nanoseconds is
really annoying. It would be nice if we could replace the internal
runtime "time" with arbitrary units and put the conversion to nanoseconds
only in the places that really need it (so it isn't in every nanotime call).
It's especially annoying because numer==denom==1 for all the machines
I tried. Makes it hard to test the conversion code :(
Update #17490
Change-Id: I6c5d602a802f5c24e35184e33d5e8194aa7afa86
Reviewed-on: https://go-review.googlesource.com/110655
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
A few libc_ calls were missing stack switches.
Unfortunately, adding the stack switches revealed a deeper problem.
systemstack() is fundamentally flawed because when you do
systemstack(func() { ... })
There's no way to mark the anonymous function as nosplit. At first I
thought it didn't matter, as that function runs on the g0 stack. But
nosplit is still required, because some syscalls are done when stack
bounds are not set up correctly (e.g. in a signal handler, which runs
on the g0 stack, but g is still pointing at the g stack). Instead use
asmcgocall and funcPC, so we can be nosplit all the way down.
Mid-stack inlining now pushes darwin over the nosplit limit also.
Leaving that as a TODO.
Update #23168
This might fix the cause of occasional darwin hangs.
Update #25181
Update #17490
Change-Id: If9c3ef052822c7679f5a1dd192443f714483327e
Reviewed-on: https://go-review.googlesource.com/111258
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This block of code once was commented by the original author, but commenting
code looks a little annoying. However, the debugSelect flag is just for the
situation that debug code will be compiled when debuging, when release this
code will be eliminated by the compiler.
Change-Id: I7b94297e368b515116ef44a36058214ddddf9adb
Reviewed-on: https://go-review.googlesource.com/113395
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When a variable of type int is compared with sizeof's return
value, gcc warns:
comparison between signed and unsigned integer expressions
Change the type of a couple loop indices that looped over sizeof from
int to size_t to silence the warnings.
Fixes#25411
Change-Id: I2c7858f84237e77945651c7b1b6a75b97edcef65
Reviewed-on: https://go-review.googlesource.com/113335
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently we have two nearly identical copies of the code that fetches
the locals and arguments liveness maps for a frame, plus a third
that's a poor knock-off. Unify these all into a single function.
Change-Id: Ibce7926a0b0e3d23182112da4e25df899579a585
Reviewed-on: https://go-review.googlesource.com/109698
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
replace map clears of the form:
for k := range m {
delete(m, k)
}
(where m is map with key type that is reflexive for ==)
with a new runtime function that clears the maps backing
array with a memclr and reinitializes the hmap struct.
Map key types that for example contain floats are not
replaced by this optimization since NaN keys cannot
be deleted from maps using delete.
name old time/op new time/op delta
GoMapClear/Reflexive/1 92.2ns ± 1% 47.1ns ± 2% -48.89% (p=0.000 n=9+9)
GoMapClear/Reflexive/10 108ns ± 1% 48ns ± 2% -55.68% (p=0.000 n=10+10)
GoMapClear/Reflexive/100 303ns ± 2% 110ns ± 3% -63.56% (p=0.000 n=10+10)
GoMapClear/Reflexive/1000 3.58µs ± 3% 1.23µs ± 2% -65.49% (p=0.000 n=9+10)
GoMapClear/Reflexive/10000 28.2µs ± 3% 10.3µs ± 2% -63.55% (p=0.000 n=9+10)
GoMapClear/NonReflexive/1 121ns ± 2% 124ns ± 7% ~ (p=0.097 n=10+10)
GoMapClear/NonReflexive/10 137ns ± 2% 139ns ± 3% +1.53% (p=0.033 n=10+10)
GoMapClear/NonReflexive/100 331ns ± 3% 334ns ± 2% ~ (p=0.342 n=10+10)
GoMapClear/NonReflexive/1000 3.64µs ± 3% 3.64µs ± 2% ~ (p=0.887 n=9+10)
GoMapClear/NonReflexive/10000 28.1µs ± 2% 28.4µs ± 3% ~ (p=0.247 n=10+10)
Fixes#20138
Change-Id: I181332a8ef434a4f0d89659f492d8711db3f3213
Reviewed-on: https://go-review.googlesource.com/110055
Reviewed-by: Keith Randall <khr@golang.org>
Currently isSystemGoroutine has a hard-coded list of known entry
points into system goroutines. This list is annoying to maintain. For
example, it's missing the ensureSigM goroutine.
Replace it with a check that simply looks for any goroutine with
runtime function as its entry point, with a few exceptions. This also
matches the definition recently added to the trace viewer (CL 81315).
Change-Id: Iaed723d4a6e8c2ffb7c0c48fbac1688b00b30f01
Reviewed-on: https://go-review.googlesource.com/81655
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The hmap field in the maptype is only used by the runtime to check the sizes of
the hmap structure created by the compiler and runtime agree.
Comments are already present about the hmap structure definitions in the
compiler and runtime needing to be in sync.
Add a test that checks the runtimes hmap size is as expected to detect
when the compilers and runtimes hmap sizes diverge instead of checking
this at runtime when a map is created.
Change-Id: I974945ebfdb66883a896386a17bbcae62a18cf2a
Reviewed-on: https://go-review.googlesource.com/91796
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
