Change-Id: I9c4c3ada3a8f5d8d198cc42a4afc06972ee00c61
GitHub-Last-Rev: 4ed80119e3
GitHub-Pull-Request: golang/go#54916
Reviewed-on: https://go-review.googlesource.com/c/go/+/428921
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Change-Id: Ib9746cb4f27625cb22620271b280d2da242b2fba
Reviewed-on: https://go-review.googlesource.com/c/go/+/428437
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Implement CLONE_INTO_CGROUP feature, allowing to put a child in a
specified cgroup in a clean and simple way. Note that the feature only
works for cgroup v2, and requires Linux kernel 5.7 or newer.
Using the feature requires a new syscall, clone3. Currently this is the
only reason to use clone3, but the code is structured in a way so that
other cases may be easily added in the future.
Add a test case.
While at it, try to simplify the syscall calling code in
forkAndExecInChild1, which became complicated over time because:
1. It was using either rawVforkSyscall or RawSyscall6 depending on
whether CLONE_NEWUSER was set.
2. On Linux/s390, the first two arguments to clone(2) system call are
swapped (which deserved a mention in Linux ABI hall of shame). It
was worked around in rawVforkSyscall on s390, but had to be
implemented via a switch/case when using RawSyscall6, making the code
less clear.
Let's
- modify rawVforkSyscall to have two arguments (which is also required
for clone3);
- remove the arguments workaround from s390 asm, instead implementing
arguments swap in the caller (which still looks ugly but at least
it's done once and is clearly documented now);
- use rawVforkSyscall for all cases (since it is essentially similar to
RawSyscall6, except for having less parameters, not returning r2, and
saving/restoring the return address before/after syscall on 386 and
amd64).
Updates #51246.
Change-Id: Ifcd418ebead9257177338ffbcccd0bdecb94474e
Reviewed-on: https://go-review.googlesource.com/c/go/+/417695
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First, we know that Go source files almost always weigh at least a few
kilobytes, so we can kickstart the output buffer to be a reasonable size
and reduce the initial number of incremental allocations and copies when
appending bytes or strings to output.
Second, in nodeSize we use a nested printer, but we don't actually need
its printed bytes - we only need to know how many bytes it prints.
For that reason, use a throwaway buffer: the part of our output buffer
between length and capacity, as we haven't used it yet.
Third, use a sync.Pool to reuse allocated printers.
The current API doesn't allow reusing printers,
and some programs like gofmt will print many files in sequence.
Those changes combined result in a modest reduction in allocations and
CPU usage. The benchmark uses testdata/parser.go, which has just over
two thousand lines of code, which is pretty standard size-wise.
We also split the Print benchmark to cover both a medium-sized ast.File
as well as a pretty small ast.Decl node. The latter is a somewhat common
scenario in gopls, which has code actions which alter small bits of the
AST and print them back out to rewrite only a few lines in a file.
name old time/op new time/op delta
PrintFile-16 5.43ms ± 1% 4.85ms ± 3% -10.68% (p=0.000 n=9+10)
PrintDecl-16 19.1µs ± 0% 18.5µs ± 1% -3.04% (p=0.000 n=10+10)
name old speed new speed delta
PrintFile-16 9.56MB/s ± 1% 10.69MB/s ± 3% +11.81% (p=0.000 n=8+10)
PrintDecl-16 1.67MB/s ± 0% 1.73MB/s ± 1% +3.05% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
PrintFile-16 332kB ± 0% 107kB ± 2% -67.87% (p=0.000 n=10+10)
PrintDecl-16 3.92kB ± 0% 3.28kB ± 0% -16.38% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
PrintFile-16 3.45k ± 0% 2.42k ± 0% -29.90% (p=0.000 n=10+10)
PrintDecl-16 56.0 ± 0% 46.0 ± 0% -17.86% (p=0.000 n=10+10)
Change-Id: I475a3babca77532b2d51888f49710f74763d81d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/424924
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After we deprecated reflect.{SliceHeader, StringHeader}, it is recommended
to use unsafe.{Slice, String} to replace its work. However, the compiler
and linker cannot be migrated for the time being.
As a temporary strategy, using the "internal/unsafeheader" package like
other code is the most suitable choice at present.
For #53003.
Change-Id: I69d0ef72e2d95caabd0706bbb247a719d225c758
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As discussed in CL 401434 there are substantial misuses of these in the
wild, and they are a potential source of unsafety even for code that
does not use them directly.
Since proposal #53003 has already been implemented, now is the right
time to deprecate reflect.{SliceHeader, StringHeader}.
For #53003.
Change-Id: I724cf46d4b22d2ed3cbf2b948e6aac5ee4bf0f6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/428757
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It's set but the output is never used.
Change-Id: I36ecb9c5f087a85289529907ede9f9bfc295d739
Reviewed-on: https://go-review.googlesource.com/c/go/+/428637
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Change-Id: I25c8e8b701d6489f360fea30d09090826276b950
GitHub-Last-Rev: c2c8319dd5
GitHub-Pull-Request: golang/go#54924
Reviewed-on: https://go-review.googlesource.com/c/go/+/428976
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When the type assertion fails, the test mistakenly prints the expected
(rather than the actual) type.
When the error string doesn't match, the text mistakenly prints the
original (rather than the converted) error (although there might not be
any difference in the output, the code looks wrong).
Fix both issues.
Change-Id: Ia7dd0632fc677f458fec25d899c46268a12f76e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/428916
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FixedZone is transitively called by Time.UnmarshalJSON or Time.UnmarshalText
for any RFC 3339 timestamp that is not in UTC.
This function is relatively slow since it allocates 3 times.
Given that RFC 3339 never has a zone name and most offsets are by the hour,
we can cache unnamed zones on hour offsets.
Caching a Location should be safe since it has no exported fields or methods
that can mutate the Location. It is functionally immutable.
The only way to observe that the Location was cached is either
by pointer comparison or by shallow copying the struct value.
Neither operation seems sensible to do with a *time.Location.
Performance:
name old time/op new time/op delta
UnmarshalText 268ns ± 2% 182ns ± 1% -32.01% (p=0.000 n=10+10)
Change-Id: Iab5432f34bdbb485512bb8b5464e076c03fd106f
Reviewed-on: https://go-review.googlesource.com/c/go/+/425116
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Because most of these APIs are recently supported, we can only do some
advancement work as much as possible under the premise of compatibility.
For #54854.
Change-Id: Id15d11288bf23902570d54eaf2704a5264210b2e
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For #46505.
Change-Id: I1a30fd895496befd16626afb48717ac837ed5778
Reviewed-on: https://go-review.googlesource.com/c/go/+/429315
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This was left over from the old pacer, and never removed when the old
pacer was removed in Go 1.19.
Change-Id: I79e5f0420c6100c66bd06129a68f5bbab7c1ea8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/429256
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This is an optimization that prevents N^2 behavior within a chunk, but
was accidentally skipped. There should be no functional change as a
result of this CL.
Fixes#54892.
Change-Id: I861967a2268699fdc3464bd41bc56618b5628e6b
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This change fixes an old TODO that made it a uint64 because it would
make alignment within mheap more complicated. Now that we don't have to
worry about it since we're using atomic types as much as possible,
switch to using a Uintptr. This likely will improve performance a tiny
bit on 32-bit platforms, but really it's mostly cleanup.
Change-Id: Ie705799a111ccad977fc1f43de8b50cf611be303
Reviewed-on: https://go-review.googlesource.com/c/go/+/429221
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All subfields use atomic types to ensure alignment, so there's no more
need for these fields.
Change-Id: Iada4253f352a074073ce603f1f6b07cbd5b7c58a
Reviewed-on: https://go-review.googlesource.com/c/go/+/429220
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pageAlloc.chunks used to require an atomic store when growing the heap
because the scavenger would look at the list without locking the heap
lock. However, the scavenger doesn't do that anymore, and it looks like
nothing really does at all.
This change updates the comment and makes the store non-atomic.
Change-Id: Ib452d147861060f9f6e74e2d98ee111cf89ce8f5
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Right now, span sets use a lot of unsafe.Pointer and naked atomics
operations. This change modifies it to use atomic types everywhere and
wraps any atomic.UnsafePointer in a type to improve type safety.
This change should functionally be a no-op.
Change-Id: I32e6c460faaf6ec41ab1163158f6da7938eef3de
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This uses rulegen syntax which allows similar rules
to be combined, saving lines in the rules file.
The Lsh16x32 rule had an incorrect value and that was
fixed.
Change-Id: I637410e39d8554825076aca5ac24083ce05ab186
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Change-Id: I0407d96e2ba1376cc33fe91b52b6a8d7e81f59ae
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Change-Id: I1c9f91e983fb26b3e46c65513a4f14508774e543
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Change-Id: I5780c3f26302fd5cf21e4a1f0bc1777abb658c82
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Change-Id: I761766e147202970f82ce804dbaf5d491508995c
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Change-Id: I56bd5d6b1333a96339340e5af5e6470cc7fb11a2
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Change-Id: Ifb51cb4ed98a93742ce4b221137a0ad73b939b06
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Change-Id: I427776e5b2d9c7279932548c86c8faded0eed041
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Change-Id: I2ec419f475f9c5d5ef1d4557cb5862a55a699d9c
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Change-Id: I4e05b892373713365f60258f64b3de94382ad983
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The PPC64 ELFv2 supplement version 1.5 defines a handful of
new relocation types, similarly some were not added.
Fixes#54345
Change-Id: Id39b29d404298fca4a10ccf1e96b5964dc452c9e
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Change-Id: I644f696d00b5bce448e0a00835b3162f5203f346
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Change-Id: I559986b5408d3967c58c9abc6e8f4b04b25496a6
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These can be simplified with the knowledge of how arguments are
assigned to obj.Prog objects on PPC64. If the argument is not
a register type, the Reg argument (a2 in optab) of obj.Prog is
not used, and those arguments are placed into RestArgs (a3, a4, a5
in optab).
This relaxes the special case handling enforced by IsPPC64RLD and
IsPPC64ISEL. Instead, arguments are assigned as noted above, and
incorrect usage of such opcodes is checked by optab rules, not by
the assembler front-end.
Likewise, add support for handling 6 argument opcodes, these do
not exist today, but will be added with ISA 3.1 (Power10).
Finally, to maintain backwards compatibility, some 4-arg opcodes
whose middle arguments are a register and immediate, could swap
these arguments and generate identical machine code. This likely
wasn't intended, but is possible. These are explicitly fixed up
in the backend, and the asm tests are extended to check these.
Change-Id: I5f8190212427dfe8e6f062185bfefb5fa4fd0e75
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Allow the assembler frontend to match MMA register arguments added by
ISA 3.1. The prefix "A" (for accumulator) is chosen to identify them.
Updates #44549
Change-Id: I363e7d1103aee19d7966829d2079c3d876621efc
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This CL adds shiftIsBounded checks for the Lsh* and Rsh* rules in arm64.
There is no need to check the shift value again with CMP + CSEL when the
shift value is valid.
Change-Id: I54620de64f02a1b5a11089add237248ae2de01b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/417714
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Apparently, some testing environments do not allow root to mount tmpfs
(due to e.g. AppArmor profile disallowing mount(2) syscall).
Always skip the test if the mount has failed.
Fixes the test issue introduced by CL 414824.
Change-Id: Ic565d2e6f277f2926d85a351be7df2498ffba656
Reviewed-on: https://go-review.googlesource.com/c/go/+/429175
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When naming case variables, the unified frontend was using
typecheck.Lookup, which uses the current package, rather than
localIdent, which uses the package the variable was originally
declared in. When inlining across package boundaries, this could cause
the case variables to be associated with the wrong package.
In practice, I don't believe this has any negative consequences, but
it's inconsistent and triggered an ICE in typecheck.ClosureType, which
expected all captured variables to be declared in the same package.
Easy fix is to ensure case variables are declared in the correct
package by using localIdent.
Fixes#54912.
Change-Id: I7a429c708ad95723f46a67872cb0cf0c53a6a0d6
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The unified frontend ICEs when inlining a function that contains a
function literal, which captures both a type switch case variable and
another variable.
Updates #54912.
Change-Id: I0e16d371ed5df48a70823beb0bf12110a5a17266
Reviewed-on: https://go-review.googlesource.com/c/go/+/428917
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The toStringData test was meant to test reflect.StringHeader, not
reflect.SliceHeader. It's not supported to convert *string to
*reflect.SliceHeader anyway.
Change-Id: Iaa4912eafd241886c6337bd7607cdf2412a15ead
Reviewed-on: https://go-review.googlesource.com/c/go/+/428995
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The lowests fives bits are the kind, and the next five bits are attributes,
not the other way around.
Change-Id: I5e1d13b195b766e99f66bb1227cc7f84e85dc49d
Reviewed-on: https://go-review.googlesource.com/c/go/+/425185
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
