Change-Id: I03ba70076d6dd3c0b9624d14699b7dd91a3c0e9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/618476
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
On Solaris the default (non-GNU) C linker doesn't support the
--build-id flag (and I'm not aware of any alternative). So check
that the linker supports the flag before passing it.
Updates #41004, #63934.
Cq-Include-Trybots: luci.golang.try:gotip-solaris-amd64
Change-Id: I4379e5bf6eb495154d663ac4ed802ecb11fcf91c
Reviewed-on: https://go-review.googlesource.com/c/go/+/621639
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
CL 621357 introduced new generic lowering rules which caused
several shift related codegen test failures.
Add new rules to fix the test regressions, and cleanup tests
which are changed but not regressed. Some CLRLSLDI tests are
removed as they are no test CLRLSLDI rules.
Fixes#70003
Change-Id: I1ecc5a7e63ab709a4a0cebf11fa078d5cf164034
Reviewed-on: https://go-review.googlesource.com/c/go/+/622236
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Goroutine profiles require checking in with the profiler before any
goroutine starts running. coroswitch is a place where a goroutine may
start running, but where we do not check in with the profiler, which
leads to crashes. Fix this by checking in with the profiler the same way
execute does.
Fixes#69998.
Change-Id: Idef6dd31b70a73dd1c967b56c307c7a46a26ba73
Reviewed-on: https://go-review.googlesource.com/c/go/+/622016
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
A previous CL broke the ASAN poisoning calculation in mallocgc by not
taking into account a possible allocation header, so the beginning of
the following allocation could have been poisoned.
This mostly isn't a problem, actually, since the following slot would
usually just have an allocation header in it that programs shouldn't be
touching anyway, but if we're going a word-past-the-end at the end of a
span, we could be poisoning a valid heap allocation.
Change-Id: I76a4f59bcef01af513a1640c4c212c0eb6be85b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/622295
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Non-Linux builder hardware is more varied, and the important thing is
that we test on at least one builder.
Fixes#70014Fixes#70013Fixes#70012
Change-Id: I33c4483c8b2792f6a15d6532e8cbae98b2888ea5
Reviewed-on: https://go-review.googlesource.com/c/go/+/622096
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Replace Transport's limit of 5 1xx responses with a limit based
on MaxResponseHeaderBytes: The total number of responses
(including 1xx reponses and the final response) must not exceed
this value.
When the user is reading 1xx responses using a Got1xxResponse
client trace hook, disable the limit: Each 1xx response is
individually limited by MaxResponseHeaderBytes, but there
is no limit on the total number of responses. The user is
responsible for imposing a limit if they want one.
For #65035
Change-Id: If4bbbbb0b808cb5016701d50963c89f0ce1229f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/615255
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
We were missing a case for calling a C function with an index
into a pointer-to-array.
Fixes#70016
Change-Id: I9c74d629e58722813c1aaa0f0dc225a5a64d111b
Reviewed-on: https://go-review.googlesource.com/c/go/+/621576
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This adds V0 through V31 as vector registers, which are available on CPUs
that support the V extension.
Change-Id: Ibffee3f9a2cf1d062638715b3744431d72d451ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/595404
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: 鹏程汪 <wangpengcheng.pp@bytedance.com>
Regenerate the riscv instruction encoding table with the V extension
enabled. Add constants and names for the resulting 375 instructions.
Change-Id: Icce688493aeb1e9880fb76a0618643f57e481273
Reviewed-on: https://go-review.googlesource.com/c/go/+/595403
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: 鹏程汪 <wangpengcheng.pp@bytedance.com>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Mark Ryan <markdryan@rivosinc.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Fixes#70004Fixes#70005
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-noopt
Change-Id: I6766a722f124646262fa0d2a1ff245f8b93bc920
Reviewed-on: https://go-review.googlesource.com/c/go/+/622095
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Change-Id: I49c7107d9624c9a8aa97dcc87e2d4722b9ba0a20
Reviewed-on: https://go-review.googlesource.com/c/go/+/622055
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
The BSD implementation of poll.SendFile incorrectly halted
copying after succesfully writing one full chunk of data.
Adjust the copy loop to match the Linux and Solaris
implementations.
In testing, empirically macOS appears to sometimes return
EAGAIN from sendfile after successfully copying a full
chunk. Add a check to all implementations to return nil
after successfully copying all data if the last sendfile
call returns EAGAIN.
For #70000
Change-Id: I57ba649491fc078c7330310b23e1cfd85135c8ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/622235
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
The minimum Linux kernel version for Go 1.24 is now set to 3.2.
Updates #67001
For #68545
Change-Id: I509f09c8ed7f3067af14066cf139008db0cb06ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/622015
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
When the kernel parameter ptrace_scope is set to 2 or 3,
certain test cases in runtime-gdb_test.go will fail.
We should skip these tests.
Fixes#69932
Change-Id: I685d1217f1521d7f8801680cf6b71d8e7a265188
GitHub-Last-Rev: 063759e04c
GitHub-Pull-Request: golang/go#69933
Reviewed-on: https://go-review.googlesource.com/c/go/+/620857
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
There is no need to remove all write accesses when O_APPEND is set,
only the FILE_WRITE_DATA access. This will allow files opened with
O_APPEND and O_WRONLY to be have their attributes and ACLs modified.
Change-Id: I6fe3b25e87b141a9eb30805f395fec31242fd35d
Reviewed-on: https://go-review.googlesource.com/c/go/+/620615
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Flags from CGo directives should be placed before extldflags so that
extldflags get more preference. This is also the order followed by the
final link command.
Fixes#69350
Change-Id: I2cfb22ae4ea7a160cc614440e88ef2eb82ea7399
Reviewed-on: https://go-review.googlesource.com/c/go/+/614275
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
This is needed from inside the module, and we generally don't want to
import the crypto tree from it.
For #69536
Change-Id: I69e91e4df89ecac0016c671ccd28e733a7131533
Reviewed-on: https://go-review.googlesource.com/c/go/+/616716
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
This will be required for #69536 but is also good hygiene and required
by go.dev/wiki/AssemblyPolicy.
> The code must be tested in our CI. This means there need to be
> builders that support the instructions, and if there are multiple (or
> fallback) paths they must be tested separately.
The new crypto/internal/impl registry lets us select alternative
implementations from both the same package and importers (such as
crypto/sha256 tests once we have crypto/internal/fips/sha256, or
crypto/hmac).
Updates #69592
Updates #69593
Change-Id: Ifea22a9fc9ccffcaf4924ff6bd08da7c9bd39e99
Cq-Include-Trybots: luci.golang.try:gotip-linux-arm64-longtest,gotip-linux-amd64-longtest,gotip-linux-ppc64le_power8,gotip-linux-ppc64_power8
Reviewed-on: https://go-review.googlesource.com/c/go/+/614656
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Ensure separate implementations are implemented in different functions
called from Go, and that they can be turned off from a GODEBUG.
This will be necessary to test implementations separately for #69536.
Change-Id: I3e081deb7abb01b0665265e39c72fd4037dd48b3
Cq-Include-Trybots: luci.golang.try:gotip-linux-arm64-longtest,gotip-linux-amd64-longtest,gotip-linux-ppc64le_power8,gotip-linux-ppc64_power8
Reviewed-on: https://go-review.googlesource.com/c/go/+/614495
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This CL is inspired by:
https://github.com/golang/go/issues/29310#issuecomment-758768325
When I read omitempty option in encoding/xml package, I find it's
a bit different than encoding/json package.
I think it's more precise to say:
"any array, slice, map, or string of length zero."
Update #29310
Change-Id: Ia77167c3155411640224b349d4b34d0bb91ee11e
GitHub-Last-Rev: a4cf00dcc7
GitHub-Pull-Request: golang/go#69984
Reviewed-on: https://go-review.googlesource.com/c/go/+/621835
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Michael Pratt <mpratt@google.com>
Simplify the code and reduce global variables.
Change-Id: Id322836e8b6b6c4434136b95700ed4070ba52300
GitHub-Last-Rev: 7c9d409855
GitHub-Pull-Request: golang/go#69962
Reviewed-on: https://go-review.googlesource.com/c/go/+/621456
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Fixes#69635
Change-Id: I4f8d7dafb34ccfb943c29f96c982278ab7edcd05
Reviewed-on: https://go-review.googlesource.com/c/go/+/621357
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Change some vars to consts, remove some unneeded string conversions.
Change-Id: Ib12eed11ef080c4b593c8369bb915117e7100045
Reviewed-on: https://go-review.googlesource.com/c/go/+/621838
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
For #51026Fixes#69971
Change-Id: I47f2938d20cbe9462bf738a506baedad4a7006c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/621837
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Change the description of an operand x that has a named type of sorts
by providing a description of the type structure (array, struct, slice,
pointer, etc).
For instance, given a (variable) operand x of a struct type T, the
operand is mentioned as (new):
x (variable of struct type T)
instead of (old):
x (variable of type T)
This approach is also used when a basic type is renamed, for instance
as in:
x (value of uint type big.Word)
which makes it clear that big.Word is a uint.
This change is expected to produce more informative error messages.
Fixes#69955.
Change-Id: I544b0698f753a522c3b6e1800a492a94974fbab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/621458
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Simplify functionality of compositeKind (formerly: kindString) by
giving it a smaller scope. Move it into operand.go for future use
in that file. Adjust existing uses.
Change-Id: I73d04a8c0be44d9604e56bd4c0289afdcdd32238
Reviewed-on: https://go-review.googlesource.com/c/go/+/621457
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Tim King <taking@google.com>
Change-Id: I27bf98e84545746d90948dd06c4a7bd70782c49d
Reviewed-on: https://go-review.googlesource.com/c/go/+/621895
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
This change improves error message for recursive types.
Currently, compilation of the [following program](https://go.dev/play/p/3ef84ObpzfG):
package main
type T1[T T2] struct{}
type T2[T T1] struct{}
returns an error:
./prog.go:3:6: invalid recursive type T1
./prog.go:3:6: T1 refers to
./prog.go:4:6: T2 refers to
./prog.go:3:6: T1
With the patch applied the error message looks like:
./prog.go:3:6: invalid recursive type T1
./prog.go:3:6: T1 refers to T2
./prog.go:4:6: T2 refers to T1
Change-Id: Ic07cdffcffb1483c672b241fede4e694269b5b79
GitHub-Last-Rev: cd042fdc38
GitHub-Pull-Request: golang/go#69574
Reviewed-on: https://go-review.googlesource.com/c/go/+/614084
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This package is no longer needed now that typeparams
are unconditionally enabled. Its declarations have been
moved into the go/{types,parser} packages.
Change-Id: Ife79a17eb9d29b076cabbf8a4b2ff2aea5edfc8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/621640
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This causes more inlining for rangefunc code.
The PAUTOHEAP case catches closure-passed-as-param
to function that returns a closure, that calls the
outer PPARAM.
Change-Id: I927cf2e1924ed2191e0ad8be9a1f2e793b6f2b38
Reviewed-on: https://go-review.googlesource.com/c/go/+/620220
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
If a function f being considered for inlining calls
one of its parameters, reduce the normal cost of that
call (57) to 17 to increase the chance that f will
be inlined and (with luck) that parameter will be
revealed as a constant function (which unblocks
escape analysis) or perhaps even be inlined.
The least-change value for that was still effective for
iter_test benchmarks was 32; however tests showed no
particular harm even when reduced as low as 7, and there
have been reports of other performance problems with
rangefunc overheads and so I picked a middling number
in hopes of warding off such reports.
Updates #69015
Change-Id: I2a525c1beffb9f88daa14caa8a622864b023675c
Reviewed-on: https://go-review.googlesource.com/c/go/+/609095
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
The spill/restore code around morestack is almost never exectued, so
we should make it as small as possible. Using 2-register loads/stores
makes sense here. Also, the offsets from SP are pretty small so the
offset almost always fits in the (smaller than a normal load/store)
offset field of the instruction.
Makes cmd/go 0.6% smaller.
Change-Id: I8845283c1b269a259498153924428f6173bda293
Reviewed-on: https://go-review.googlesource.com/c/go/+/621556
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Check presence of LSE support on ARM64 chip if we targeted it at compile time.
Related to #69124
Update #60905
Change-Id: I6fe244decbb4982548982e1f88376847721a33c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/610195
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Shu-Chun Weng <scw@google.com>
As described in issue #69912, type checking dot-imported identifiers can
result in a call to objDecl on an imported object, which leads to a data
race to the color_ field.
There are multiple potential fixes for this race. Opt for avoiding the
call to objDecl altogether, rather than setting color_ during import.
The color_ field is an internal property of objects that should only be
valid during the type checking of their package. We should not be
calling objDecl on imported objects.
Fixes#69912
Change-Id: I55eb652479715f2a7ac84104db2f448091c4e7ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/621637
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
For #54766.
Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10,gotip-linux-amd64-longtest-swissmap
Change-Id: I6695c0b143560d974b710e1d78e7a7d09278f7cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/620215
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Currently, for Wasm, the linker sets the initial memory size to
the size of global data plus 16 MB. The intention is that it
covers the global data and runtime initialization without growing
the linear memory. However, the code accounts only the data
"section", not the bss "section", therefore the extra 16 MB is
actually used to cover bss variables. Also, as seen on the
previous CL, the runtime actually didn't use the extra space,
which means the program can start without that space.
This CL corrects the global data size calculation, and reduces the
extra to 1 MB. Currently the runtime's allocation pattern at
startup is that it allocates a few pages for the page allocator's
metadata, the an 8 MB reservation for the first 4 MB size, 4 MB
aligned heap arena (it may be possible to reduce that, but we'll
leave that for later). Here we use 1 MB extra space to cover the
small allocations, but let the runtime allocate the heap arena, so
the linker code and the runtime's allocator are not tightly
coupled.
For #69018.
Change-Id: I39fe1172382ecc03f4b537e43ec710af8075eab3
Reviewed-on: https://go-review.googlesource.com/c/go/+/621636
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
