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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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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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TBR=austin
CC=golang-codereviews
https://codereview.appspot.com/178700044
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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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LGTM=rsc
R=rsc, bradfitz
CC=golang-codereviews
https://codereview.appspot.com/178210043
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LGTM=minux
R=rsc, minux
CC=golang-codereviews
https://codereview.appspot.com/177170043
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LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/169620043
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I tested building Go itself, but not any of go.mobile tests.
LGTM=crawshaw
R=crawshaw, rsc
CC=golang-codereviews
https://codereview.appspot.com/179110043
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Otherwise both zgoos_linux.go and zgoos_android.go will be compiled
for GOOS=android.
LGTM=crawshaw, rsc
R=rsc, crawshaw
CC=golang-codereviews
https://codereview.appspot.com/178110043
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Thanks to Aram H?v?rneanu, Nick Owens
and Russ Cox for the early reviews.
LGTM=aram, rsc
R=rsc, lucio.dere, aram, ality
CC=golang-codereviews, mischief
https://codereview.appspot.com/175370043
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LGTM=dave
R=minux, dave
CC=golang-codereviews
https://codereview.appspot.com/181030043
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LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/175480043
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uint16 occupies 2 bytes, not 1
LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/178100043
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TBR=austin
CC=golang-codereviews
https://codereview.appspot.com/179040044
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LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/177090043
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struct siginfo_t's si_addr field is part of a union.
Previously, we represented this union in Go using an opaque
byte array and accessed the si_addr field using unsafe (and
wrong on 386 and arm!) pointer arithmetic. Since si_addr is
the only field we use from this union, this replaces the
opaque byte array with an explicit declaration of the si_addr
field and accesses it directly.
LGTM=minux, rsc
R=rsc, minux
CC=golang-codereviews
https://codereview.appspot.com/179970044
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Previously, this used the top 8 bits of an instruction as a
sort-of opcode and ignored the top two bits of the relative
PC. This worked because these jumps are always negative and
never big enough for the top two bits of the relative PC (also
the bottom 2 bits of the sort-of opcode) to be anything other
than 0b11, but the code is confusing because it doesn't match
the actual structure of the instruction.
Instead, use the real 6 bit opcode and use all 24 bits of
relative PC.
LGTM=rsc
R=rsc, dave
CC=golang-codereviews
https://codereview.appspot.com/179960043
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