errClosed was introduced by CL 163058 and was supposed to be removed by CL 243906,
but somehow it was left out, now we should get it deleted.
Change-Id: I74c4b36b8bbc4844e1860acb022a16b0aa3272b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/427035
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The file was added in CL 181839 which was submitted in 2019.
Also delete the superfluous //go:build windows build constraint which is
already part of the file name.
Change-Id: Iecdf3d75848a7b8e2a76cd18c9fff4fb90acdac2
Reviewed-on: https://go-review.googlesource.com/c/go/+/427854
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Change-Id: I49f8c764d49cabaad4d6859c219ba7220a389c1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/427140
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Happy to use another service if web.archive.org isn't suitable.
Note: the original page redirects and then links to some nsfw content.
Change-Id: Ie93ca0c6aad871881f35b7e5609b96da5c14cfc0
GitHub-Last-Rev: ced5a97eb5
GitHub-Pull-Request: golang/go#54857
Reviewed-on: https://go-review.googlesource.com/c/go/+/428236
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
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CL 424257 modified gentraceback to switch gp when jumping from a
system stack to a user stack to simplify reasoning through the rest of
the function. This has the unintended side-effect of also switching
all references to gp.m. The vast majority of the time, g0.m and curg.m
are the same across a stack switch, making this a no-op, but there's
at least one case where this isn't true: if a profiling signal happens
in execute between setting mp.curg and setting gp.m. In this case,
mp.curg.m is briefly nil, which can cause gentraceback to crash with a
nil pointer dereference. We see this failure (surprisingly
frequently!) in profiling tests in the morestack=mayMoreStackPreempt
testing mode (#48297).
Fix this by making only jumping stacks if doing so will not switch Ms.
This restores the original property that gp.m doesn't change across
the stack jump, and makes gentraceback a little more conservative
about jumping stacks.
Fixes#54885.
Change-Id: Ib1524c41c748eeff35896e0f3abf9a7efbe5969f
Reviewed-on: https://go-review.googlesource.com/c/go/+/428656
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Change-Id: I02c4664f1ba72623a5470e92bbebabb2f4862428
Reviewed-on: https://go-review.googlesource.com/c/go/+/428264
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Change-Id: Ibab20627ccd1f79e77e3972e2bc6ca42c2c7de13
Reviewed-on: https://go-review.googlesource.com/c/go/+/428263
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Change-Id: I0a51aa9e7800689c123ce3eaf74742a4641b7681
Reviewed-on: https://go-review.googlesource.com/c/go/+/428261
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Change-Id: Iab6ef8c6c74c09e8358f7d7088a82089725479ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/428260
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Change-Id: Iee846c4ac0f111ff97aa618dd42f6b2d14aa4342
Reviewed-on: https://go-review.googlesource.com/c/go/+/428259
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Change-Id: Ib07699df8ea41fd8d1bca8ad050859fac24623de
Reviewed-on: https://go-review.googlesource.com/c/go/+/428258
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Change-Id: I59db11212758b478248f34c031501a167335348c
Reviewed-on: https://go-review.googlesource.com/c/go/+/428257
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Change-Id: Ief82f12a5c48c46165c28140997d5fc83700c758
Reviewed-on: https://go-review.googlesource.com/c/go/+/428256
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Change-Id: I07e022ffc022bca6aa12165871e723db3ed83141
Reviewed-on: https://go-review.googlesource.com/c/go/+/428255
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Change-Id: Icb53d32f2de13287b1b4f4f67dab90fe5ee7a3df
Reviewed-on: https://go-review.googlesource.com/c/go/+/428254
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This reverts https://go.dev/cl/427135.
Reason for revert: broke the test it modified on linux-amd64-noopt.
--- FAIL: TestDebugCallUnsafePoint (0.00s)
debug_test.go:265: want "call not at safe point", got %!s(<nil>)
Change-Id: I044c9720aed2d5e48b56bd7ab2781462270dcae9
Reviewed-on: https://go-review.googlesource.com/c/go/+/428395
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Change-Id: Ic7f827b8ee758c991ed76be65026b0330207deea
Reviewed-on: https://go-review.googlesource.com/c/go/+/428262
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This reverts https://go.dev/cl/425881.
Reason for revert: broke make.bash on linux/amd64 with Linux 5.19.6.
[...]
Building Go toolchain2 using go_bootstrap and Go toolchain1.
go install internal/unsafeheader: copying /tmp/go-build4206185186/b007/_pkg_.a to /home/mvdan/tip/pkg/linux_amd64/internal/unsafeheader.a: write /home/mvdan/tip/pkg/linux_amd64/internal/unsafeheader.a: copy_file_range: invalid cross-device link
go install internal/goarch: copying /tmp/go-build4206185186/b006/_pkg_.a to /home/mvdan/tip/pkg/linux_amd64/internal/goarch.a: write /home/mvdan/tip/pkg/linux_amd64/internal/goarch.a: copy_file_range: invalid cross-device link
[...]
Change-Id: I793856935d4315a870c2d31da46be00cc342b5f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/428396
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A few minor improvements for KernelVersion for the sake of readability.
Change-Id: I06d2df60ecee8ee0ae603952470fb73e7dcd5d74
Reviewed-on: https://go-review.googlesource.com/c/go/+/427676
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Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Since values[2] elements are initialized with 0, the switch statement
doesn't do anything. Remove it.
Change-Id: I41176692cdf0c01fe8e85315f0c0dc8b0f3d41fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/427675
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Use an atomic.Uint32 to represent the state of finalizer goroutine.
fingStatus will only be changed to fingWake in non fingWait state,
so it is safe to set fingRunningFinalizer status in runfinq.
name old time/op new time/op delta
Finalizer-8 592µs ± 4% 561µs ± 1% -5.22% (p=0.000 n=10+10)
FinalizerRun-8 694ns ± 6% 675ns ± 7% ~ (p=0.059 n=9+8)
Change-Id: I7e4da30cec98ce99f7d8cf4c97f933a8a2d1cae1
Reviewed-on: https://go-review.googlesource.com/c/go/+/400134
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The initial CL 229101 didn't limit the kernel version, but relies on error checking to
ensure the kernel version >= 4.5 or >= 5.3 when it's calling copy_file_range(2) to copy data across file systems.
Since we have now put the kernel version checking at the beginning of the function, introduced by CL 268338,
which returns early instead of going forward to the code behind when the kernel verion is older than 5.3,
therefore, those subsequent related error checks are no longer needed.
Change-Id: Ifc4a530723e21f0bde91d6420cde9cb676081922
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Consistently wait for idle connections to become readable before
starting the ReadHeaderTimeout timer. Previously, connections with no
idle timeout skipped directly to reading headers, so the
ReadHeaderTimeout also included time spent idle.
Fixes#54784
Change-Id: Iff1a876f00311d03dfa0fbef5b577506c62f7c41
GitHub-Last-Rev: 09332743ad
GitHub-Pull-Request: golang/go#54785
Reviewed-on: https://go-review.googlesource.com/c/go/+/426895
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As net package has one of the biggest init time in standard library, I have tried to improve performance by doing two things in net/addrselect.go:
1. Precompute slice with RFC rules. Currently the rules are computed and sorted in init() function. We could save the time and allocations by using prepopulated values in sorted manner. The rules haven't changed since 2015. To be extra safe we could move order validation as test case. It should slightly speed up startup of each binary with "net" package and go dns resolver. It also saves 38 allocations, ~50% of allocations in init phase of `net` module.
2. Replace internal net.IP usage with netip.Addr in `sortByRFC6724` function. It results in ~40% performance improvement on samples from tests.
The only risk is the difference between net.IP and netip.Addr behaviour.
Init benchmark:
Init-8 1.89µs ± 2% 0.12µs ± 3% -93.79% (p=0.000 n=5+5)
name old alloc/op new alloc/op delta
Init-8 1.05kB ± 0% 0.38kB ± 0% ~ (zero variance)
name old allocs/op new allocs/op delta
Init-8 39.0 ± 0% 1.0 ± 0% ~ (zero variance)
Whole sortByRFC6724 function benchmark:
name old time/op new time/op delta
SortByRFC6724/0-8 463ns ± 3% 303ns ± 4% -34.72% (p=0.000 n=5+5)
SortByRFC6724/1-8 481ns ± 8% 306ns ± 1% -36.46% (p=0.000 n=5+5)
SortByRFC6724/2-8 470ns ± 4% 307ns ± 4% -34.77% (p=0.000 n=5+5)
SortByRFC6724/3-8 567ns ± 3% 367ns ± 3% -35.28% (p=0.000 n=5+5)
SortByRFC6724/4-8 918ns ± 3% 560ns ± 2% -38.93% (p=0.000 n=5+5)
Updates #54032
Change-Id: Ic18df1ea73805cb184c6ceb73470ca7f0b922032
Reviewed-on: https://go-review.googlesource.com/c/go/+/419356
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Note that this changes some unsynchronized operations of g.atomicstatus to synchronized operations.
Updates #53821
Change-Id: If249d62420ea09fbec39b570942f96c63669c333
Reviewed-on: https://go-review.googlesource.com/c/go/+/425363
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So it's consistent when running "go list -f '{{context.ToolTags}}'" and
printing the content of "build.Default.ToolTags".
Updates #45454
Change-Id: I7a3cbf3cdf9a6ce2b8c89e9bcf5fc5e9086d48e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/422615
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as setup by the kernel on GOARCH=arm64.
Update #50947
Change-Id: I2f44be9b36e9ce8d264eccc0aa3df10825c5f4f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/422977
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Currently, there are 3 functions returning Linux kernel version numbers.
Two of them are identical:
- in net, initially added by commit 0a9dd47dd817904e;
- in internal/poll, initially added by commit 1c7650aa93bd53;
(both were later fixed by commit 66c0264506).
The third one is a more complex, regexp-based implementation in
runtime/pprof, which is only used for a test.
Instead of adding one more, let's consolidate existing ones.
Remove the complex implementation, and move the simple one into
internal/syscall/unix. Use it from all the three places mentioned above.
Change-Id: I4a34d9ca47257743c16def30e4dd634e36056091
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Also, consistently use declaration: var buf strings.Builder.
We don't change exported signatures to match go/types (where we
can't change the exported signatures for backward-compatibility).
Change-Id: I75350886aa231889ae2fd5c4008dd4be9ed6e09f
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The kernel knob /proc/sys/kernel/unprivileged_userns_clone is
only available in Debian (and Ubuntu) kernels, so if the tests
are run on e.g. Fedora, skipUnprivilegedUserClone() skips a lot
of tests.
Modify it to treat ENOENT as "it should work".
Change-Id: I959201ede139ede989cc8ab646c9bf51e0539ada
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Previously when a printer had a large buffer we dropped both
the buffer and the printer. There is no need to drop the printer
in this case, as a printer with a nil buffer is valid. So we
just drop the buffer and recycle the printer anyway.
This saves one allocation in case the buffer is over the limit.
Also tighten some of the tests for other unrelated cases.
Change-Id: Iba1b6a71ca4691464b8c68ab0b6ab0d4d5d6168c
Reviewed-on: https://go-review.googlesource.com/c/go/+/427395
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Currently, the itabs section for runtime dictionaries includes its own
redundant *runtime._type pointers for typ and iface, which were
sometimes necessary. This simplified the initial implementation, but
is a little wasteful of space when the same type or interface appeared
across multiple (typ, iface) pairs.
This CL instead reuses the pointers from the rtypes section.
Change-Id: I48448515c319c0403c1a8e7706794d443176f0a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/427754
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Convert subtraction from const to a negated ADDI with negative const
value, where possible. At worst this avoids a register load and uses
the same number of instructions. At best, this allows for further
optimisation to occur, particularly where equality is involved.
For example, this sequence:
li t0,-1
sub t1,t0,a0
snez t1,t1
Becomes:
addi t0,a0,1
snez t0,t0
Removes more than 2000 instructions from the Go binary on linux/riscv64.
Change-Id: I68f3be897bc645d4a8fa3ab3cef165a00a74df19
Reviewed-on: https://go-review.googlesource.com/c/go/+/426263
Reviewed-by: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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The FNES and FNED instructions are pseudo-instructions, which the
assembler expands to FEQS/NEG or FEQD/NEG - if we're comparing the
result via a branch instruction, we can avoid an instruction by
negating both the branch comparision and the floating point
comparision.
This only removes a handful of instructions from the Go binary,
however, it will provide benefit to floating point intensive code.
Change-Id: I4e3124440b7659acc4d9bc9948b755a4900a422f
Reviewed-on: https://go-review.googlesource.com/c/go/+/426261
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Currently these are only implicitly documented by the code that
generates and consumes them. Add explicit documentation.
Change-Id: I25a1294f04dc11785242643bec83370c66ff7a20
Reviewed-on: https://go-review.googlesource.com/c/go/+/427954
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Use the same spacing convention ("x | y") for union terms everythere,
matching the gofmt precedent.
Fixes#53279.
Change-Id: Ic3ccd7433b5f62402ba41cf05a75f9a1d99a8086
Reviewed-on: https://go-review.googlesource.com/c/go/+/410955
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Use an early return to reduce indentation and clarify flow.
For #54466.
Change-Id: I12ce810bea0f22b8707a175dc5ba66241c0a9a21
Reviewed-on: https://go-review.googlesource.com/c/go/+/425936
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Austin Clements <austin@google.com>
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The stkframe struct and its methods are strewn across different source
files. Since they actually have a pretty coherent theme at this point,
migrate it all into a new file, stkframe.go. There are no code changes
in this CL.
For #54466, albeit rather indirectly.
Change-Id: Ibe53fc4b1106d131005e1c9d491be838a8f14211
Reviewed-on: https://go-review.googlesource.com/c/go/+/424516
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Run-TryBot: Austin Clements <austin@google.com>
Auto-Submit: Austin Clements <austin@google.com>
This places getStackMap alongside argBytes and argMapInternal as
another method of stkframe.
For #54466, albeit rather indirectly.
Change-Id: I411dda3605dd7f996983706afcbefddf29a68a85
Reviewed-on: https://go-review.googlesource.com/c/go/+/424515
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Auto-Submit: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
