It's not necessary, as un-initialized refcounts haven't been shared across
goroutines yet. This saves us a bunch of slow atomic operations.
PiperOrigin-RevId: 536472388
First, they call a destructor that can be without the nosplit tag.
Second, they calls Mutex.Lock and Mutex.Unlock that are not marked as nosplit.
Fixes: #8149
Signed-off-by: Andrei Vagin <[email protected]>
All atomic 64 bit ints are changed to atomicbitops.(Ui|I)nt64. A nogo checker
enforces that sync/atomic 64 bit functions are not called.
For reviewers: the interesting changes are in the atomicbitops and checkaligned
packages.
Why do this?
- It is very easy to accidentally use atomic values without sync/atomic funcs.
- We have checkatomics, but this is optional and is forgotten in several places.
- Using a type+checker to enforce this seems less error prone and simpler.
- We get NoCopy protection.
- Use of 64 bit atomics can break 32 bit builds. We have types to handle this
without any runtime cost, so we might as well use them.
PiperOrigin-RevId: 440473398
When printing flags, FlagSet.PrintDefaults compares the Zero
value to the flag default value. The Zero refs.LeakMode value
was panicking in String() because it didn't expect the default
to be used
Closes#4023
PiperOrigin-RevId: 333150836
Use reflection and tags to provide automatic conversion from
Config to flags. This makes adding new flags less error-prone,
skips flags using default values (easier to read), and makes
tests correctly use default flag values for test Configs.
Updates #3494
PiperOrigin-RevId: 328662070
Running garbage collection enqueues all finalizers, which are used by the
refs/refs_vfs2 packages to detect reference leaks. Note that even with GC,
there is no guarantee that all finalizers will be run before the program exits.
This is a best effort attempt to activate leak checks as much as possible.
Updates #3545.
PiperOrigin-RevId: 325834438
The utility has several differences from the VFS1 equivalent:
- There are no weak references, which have a significant overhead
- In order to print useful debug messages with the type of the reference-
counted object, we use a generic Refs object with the owner type as a
template parameter. In vfs1, this was accomplished by storing a type name
and caller stack directly in the ref count (as in vfs1), which increases the
struct size by 6x. (Note that the caller stack was needed because fs types
like Dirent were shared by all fs implementations; in vfs2, each impl has
its own data structures, so this is no longer necessary.)
Updates #1486.
PiperOrigin-RevId: 325271469
The utility has several differences from the VFS1 equivalent:
- There are no weak references, which have a significant overhead
- In order to print useful debug messages with the type of the reference-
counted object, we use a generic Refs object with the owner type as a
template parameter. In vfs1, this was accomplished by storing a type name
and caller stack directly in the ref count (as in vfs1), which increases the
struct size by 6x. (Note that the caller stack was needed because fs types
like Dirent were shared by all fs implementations; in vfs2, each impl has
its own data structures, so this is no longer necessary.)
As an example, the utility is added to tmpfs.inode.
Updates #1486.
PiperOrigin-RevId: 324906582
* Rename syncutil to sync.
* Add aliases to sync types.
* Replace existing usage of standard library sync package.
This will make it easier to swap out synchronization primitives. For example,
this will allow us to use primitives from github.com/sasha-s/go-deadlock to
check for lock ordering violations.
Updates #1472
PiperOrigin-RevId: 289033387
This renames FDMap to FDTable and drops the kernel.FD type, which had an entire
package to itself and didn't serve much use (it was freely cast between types,
and served as more of an annoyance than providing any protection.)
Based on BenchmarkFDLookupAndDecRef-12, we can expect 5-10 ns per lookup
operation, and 10-15 ns per concurrent lookup operation of savings.
This also fixes two tangential usage issues with the FDMap. Namely, non-atomic
use of NewFDFrom and associated calls to Remove (that are both racy and fail to
drop the reference on the underlying file.)
PiperOrigin-RevId: 256285890
Based on the guidelines at
https://opensource.google.com/docs/releasing/authors/.
1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./'
2. Manual fixup of "Google Inc" references.
3. Add AUTHORS file. Authors may request to be added to this file.
4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS.
Fixes#209
PiperOrigin-RevId: 245823212
Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
Nothing reads them and they can simply get stale.
Generated with:
$ sed -i "s/licenses(\(.*\)).*/licenses(\1)/" **/BUILD
PiperOrigin-RevId: 231818945
Change-Id: Ibc3f9838546b7e94f13f217060d31f4ada9d4bf0
Furthermore, allow for the specification of an ElementMapper. This allows a
single "Element" type to exist on multiple inline lists, and work without
having to embed the entry type.
This is a requisite change for supporting a per-Inode list of Dirents.
PiperOrigin-RevId: 211467497
Change-Id: If2768999b43e03fdaecf8ed15f435fe37518d163
We have been unnecessarily creating too many savable types implicitly.
PiperOrigin-RevId: 206334201
Change-Id: Idc5a3a14bfb7ee125c4f2bb2b1c53164e46f29a8
