| Commit message (Collapse) | Author | Age | Files | Lines |
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640 bytes ought to be enough for anybody.
We'll bring this back down before Go 1.5. That's issue 9214.
TBR=rlh
CC=golang-codereviews
https://codereview.appspot.com/188730043
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This is going to hurt a bit but we'll make it better later.
Now the race detector can be run again.
I added the write barrier optimizations from
CL 183020043 to try to make it hurt a little less.
TBR=rlh
CC=golang-codereviews
https://codereview.appspot.com/185070043
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TBR=rlh
CC=golang-codereviews
https://codereview.appspot.com/181100044
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TBR=austin
CC=golang-codereviews
https://codereview.appspot.com/179290043
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Ensure that all gs are in a scan state when their stacks are being scanned.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/179160044
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prefetchnta for GC
We don't know what we need yet, so add them all.
Add them even on x86 architectures (as no-ops) so that
the GC can refer to them unconditionally.
Eventually we'll know what we want and probably
have just one 'prefetch' with an appropriate meaning
on each architecture.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/179160043
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LGTM=rsc
R=golang-codereviews
CC=golang-codereviews, rsc
https://codereview.appspot.com/180040043
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barriers for GC internal structures such as free lists.
LGTM=rsc
R=rsc
CC=golang-codereviews, rsc
https://codereview.appspot.com/179000043
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Brings in Linux time signature fixes. Should fix build.
TBR=austin
CC=golang-codereviews
https://codereview.appspot.com/176870043
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The garbage collector is now written in Go.
There is plenty to clean up (just like on dev.cc).
all.bash passes on darwin/amd64, darwin/386, linux/amd64, linux/386.
TBR=rlh
R=austin, rlh, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/173250043
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Now the only difference between dev.cc and dev.garbage
is the runtime conversion on the one side and the
garbage collection on the other. They both have the
same set of changes from default and dev.power64.
LGTM=austin
R=austin
CC=golang-codereviews
https://codereview.appspot.com/172570043
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This is the revision that dev.cc is branched from.
LGTM=austin
R=austin
CC=golang-codereviews
https://codereview.appspot.com/169590043
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Also improve missing GC mark diagnostics.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/169450043
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Add missing write barrier when initializing state
for newly created goroutine. Add write barrier for
same slot when preempting a goroutine.
Disable write barrier during goroutine death,
because dopanic does pointer writes.
With concurrent mark enabled (not in this CL), all.bash passed once.
The second time, TestGoexitCrash-2 failed.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/167610043
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Also rewrite some casp that don't use real pointers
to use casuintptr instead.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/166440044
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LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/174820043
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To turn concurrent gc on alter the if false in func gogc
currently at line 489 in malloc.go
LGTM=rsc
R=rsc
CC=golang-codereviews, rlh
https://codereview.appspot.com/172190043
Committer: Russ Cox <rsc@golang.org>
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This got lost in the change that added the writebarrierfat variants.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/165510043
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Now each C printf, Go print, or Go println is guaranteed
not to be interleaved with other calls of those functions.
This should help when debugging concurrent failures.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/169120043
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We still don't know why this is happening.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/169990043
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- Some sequencing issues with stopping the first gc_m round
at the right place to set up correctly for the second round.
- atomicxor8 is not idempotent; avoid xor.
- Maintain BitsDead type bits correctly; see long comment added.
- Enable checkmark phase by default for now.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/171090043
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TBR=crawshaw
R=crawshaw
CC=golang-codereviews
https://codereview.appspot.com/168860046
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This adds an independent mark phase to the GC that can be used to
verify the the default concurrent mark phase has found all reachable
objects. It uses the upper 2 bits of the boundary nibble to encode
the mark leaving the lower bits to encode the boundary and the
normal mark bit.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/167130043
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writebarrierptr
This CL implements the many multiword write barriers by calling
writebarrierptr, so that only writebarrierptr needs the actual barrier.
In lieu of an actual barrier, writebarrierptr checks that the value
being copied is not a small non-zero integer. This is enough to
shake out bugs where the barrier is being called when it should not
(for non-pointer values). It also found a few tests in sync/atomic
that were being too clever.
This CL adds a write barrier for the memory moved during the
builtin copy function, which I forgot when inserting barriers for Go 1.4.
This CL re-enables some write barriers that were disabled for Go 1.4.
Those were disabled because it is possible to change the generated
code so that they are unnecessary most of the time, but we have not
changed the generated code yet. For safety they must be enabled.
None of this is terribly efficient. We are aiming for correct first.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/168770043
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The goal here is to get the big-endian fixes so that
in some upcoming code movement for write barriers
I don't make them unmergeable.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/166890043
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LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/170730043
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LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/163390043
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LGTM=rlh
R=rlh, dvyukov
CC=golang-codereviews
https://codereview.appspot.com/157430044
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Routines and logic to preform a concurrent stack scan of go-routines.
This CL excersizes most of the functionality needed. The
major exception being that it does not scan running goroutines.
After doing the scans it relies on a STW to finish the GC, including
rescanning the stacks. It is intended to achieve correctness,
performance will follow.
LGTM=rsc
R=golang-codereviews, rsc
CC=dvyukov, golang-codereviews
https://codereview.appspot.com/156580043
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The changes got rid of the problems we were seeing.
We suspect the pushcnt field has a race.
LGTM=rsc
R=dvyukov, rsc
CC=golang-codereviews
https://codereview.appspot.com/159330043
Committer: Russ Cox <rsc@golang.org>
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hg was unable to create a CL on the code review server for this,
so I am submitting the merge by hand.
The only manual edits are in mgc0.c, to reapply the
removal of cached/ncached to the new code.
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Comments lay out the concurrent GC algorithms.
This CL implements parts of the algorithm.
The acknowledgement code has been removed from this CL
LGTM=rsc, dvyukov
R=dvyukov, rsc
CC=golang-codereviews
https://codereview.appspot.com/151540043
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This picks up the TestDualStackUDPListener fix.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/147660044
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This picks up the selectdone dangling pointer fix, among others.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/153070045
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Refactoring of the scan and mark phase so that concurrent GC,
in particular the write barrier, can share a common infrastructure.
Now that the scan and mark phases have been separated
we will be able to scan stacks without blackening any objects.
This in turn will allow us to delay installing expensive write barrier code.
LGTM=rsc
R=rsc, khr, dvyukov
CC=golang-codereviews
https://codereview.appspot.com/145640044
Committer: Russ Cox <rsc@golang.org>
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pointers
In old conservative Go, this could cause memory leaks.
A new pickier collector might reasonably crash when it saw one of these.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/147480043
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Not found because it was not used by name.
Add name in comments for what's left behind.
LGTM=rlh
R=rlh
CC=golang-codereviews
https://codereview.appspot.com/148430043
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LGTM=rlh
R=rlh, minux
CC=golang-codereviews
https://codereview.appspot.com/151940043
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TBR=austin
CC=golang-codereviews
https://codereview.appspot.com/178700044
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The new semantics of split require the newline be present.
The test was stale.
LGTM=adg
R=golang-codereviews, adg
CC=golang-codereviews
https://codereview.appspot.com/182480043
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Scanner can't handle stupid long lines and there are
reports of stupid long lines in production.
Note the issue isn't long "//go:generate" lines, but
any long line in any Go source file.
To be fair, if you're going to have a stupid long line
it's not a bad bet you'll want to run it through go
generate, because it's some embeddable asset that
has been machine generated. (One could ask why
that generation process didn't add a newline or two,
but we should cope anyway.)
Rewrite the file scanner in "go generate" so it can
handle arbitrarily long lines, and only stores in memory
those lines that start "//go:generate".
Also: Adjust the documentation to make clear that it
does not parse the file.
Fixes issue 9143.
Fixes issue 9196.
LGTM=rsc, dominik.honnef
R=rsc, cespare, minux, dominik.honnef
CC=golang-codereviews
https://codereview.appspot.com/182970043
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While we're at there, also add a message to prompt the user to install
Graphviz if "dot" command is not found.
Fixes issue 9178.
LGTM=adg, alex.brainman, cookieo9, rsc
R=rsc, adg, bradfitz, alex.brainman, cookieo9, smyrman
CC=golang-codereviews
https://codereview.appspot.com/180380043
Committer: Russ Cox <rsc@golang.org>
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Fixes issue 9199.
LGTM=iant
R=golang-codereviews, iant
CC=austin, golang-codereviews, minux
https://codereview.appspot.com/183080043
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Move change from CL 170770043 to correct file and regenerate docs
for changes from CL 164120043.
LGTM=adg
R=golang-codereviews, adg, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/183000043
Committer: Andrew Gerrand <adg@golang.org>
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During garbage collection, after scanning a stack, we think about
shrinking it to reclaim some memory. The shrinking code (called
while the world is stopped) checked that the status was Gwaiting
or Grunnable and then changed the state to Gcopystack, to essentially
lock the stack so that no other GC thread is scanning it.
The same locking happens for stack growth (and is more necessary there).
oldstatus = runtime?readgstatus(gp);
oldstatus &= ~Gscan;
if(oldstatus == Gwaiting || oldstatus == Grunnable)
runtime?casgstatus(gp, oldstatus, Gcopystack); // oldstatus is Gwaiting or Grunnable
else
runtime?throw("copystack: bad status, not Gwaiting or Grunnable");
Unfortunately, "stop the world" doesn't stop everything. It stops all
normal goroutine execution, but the network polling thread is still
blocked in epoll and may wake up. If it does, and it chooses a goroutine
to mark runnable, and that goroutine is the one whose stack is shrinking,
then it can happen that between readgstatus and casgstatus, the status
changes from Gwaiting to Grunnable.
casgstatus assumes that if the status is not what is expected, it is a
transient change (like from Gwaiting to Gscanwaiting and back, or like
from Gwaiting to Gcopystack and back), and it loops until the status
has been restored to the expected value. In this case, the status has
changed semi-permanently from Gwaiting to Grunnable - it won't
change again until the GC is done and the world can continue, but the
GC is waiting for the status to change back. This wedges the program.
To fix, call a special variant of casgstatus that accepts either Gwaiting
or Grunnable as valid statuses.
Without the fix bug with the extra check+throw in casgstatus, the
program below dies in a few seconds (2-10) with GOMAXPROCS=8
on a 2012 Retina MacBook Pro. With the fix, it runs for minutes
and minutes.
package main
import (
"io"
"log"
"net"
"runtime"
)
func main() {
const N = 100
for i := 0; i < N; i++ {
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
log.Fatal(err)
}
ch := make(chan net.Conn, 1)
go func() {
var err error
c1, err := net.Dial("tcp", l.Addr().String())
if err != nil {
log.Fatal(err)
}
ch <- c1
}()
c2, err := l.Accept()
if err != nil {
log.Fatal(err)
}
c1 := <-ch
l.Close()
go netguy(c1, c2)
go netguy(c2, c1)
c1.Write(make([]byte, 100))
}
for {
runtime.GC()
}
}
func netguy(r, w net.Conn) {
buf := make([]byte, 100)
for {
bigstack(1000)
_, err := io.ReadFull(r, buf)
if err != nil {
log.Fatal(err)
}
w.Write(buf)
}
}
var g int
func bigstack(n int) {
var buf [100]byte
if n > 0 {
bigstack(n - 1)
}
g = int(buf[0]) + int(buf[99])
}
Fixes issue 9186.
LGTM=rlh
R=austin, rlh
CC=dvyukov, golang-codereviews, iant, khr, r
https://codereview.appspot.com/179680043
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pointer, not one.
Fixes issue 9179
LGTM=iant, rsc
R=golang-codereviews, iant, rsc
CC=golang-codereviews
https://codereview.appspot.com/182160043
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We decided to build $GOOS.go always
but forgot to test $GOOS_test.go.
Fixes issue 9159.
LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/176290043
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When liblink sees something like
JMP x
...
x: JMP y
it rewrites the first jump to jump directly to y. This is
fine if y is a resolved label. However, it *also* does this
if y is a function symbol, but fails to carry over the
relocation that would later patch in that symbol's value. As
a result, the original jump becomes either a self-jump (if
relative) or a jump to PC 0 (if absolute).
Fix this by disabling this optimization if the jump being
patched in is a jump to a symbol.
LGTM=minux
R=rsc, minux
CC=golang-codereviews
https://codereview.appspot.com/185890044
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runtime/cgo
Frankly, I don't understand how the current code could possibly work except
when every android program is using cgo. Discovered this while working on
the iOS port.
LGTM=crawshaw, rsc
R=rsc, crawshaw
CC=golang-codereviews
https://codereview.appspot.com/177470043
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