2 Commits (main)

Author	SHA1	Message	Date
Will Norris	3ec5be3f51	all: remove AUTHORS file and references to it ... This file was never truly necessary and has never actually been used in the history of Tailscale's open source releases. A Brief History of AUTHORS files --- The AUTHORS file was a pattern developed at Google, originally for Chromium, then adopted by Go and a bunch of other projects. The problem was that Chromium originally had a copyright line only recognizing Google as the copyright holder. Because Google (and most open source projects) do not require copyright assignemnt for contributions, each contributor maintains their copyright. Some large corporate contributors then tried to add their own name to the copyright line in the LICENSE file or in file headers. This quickly becomes unwieldy, and puts a tremendous burden on anyone building on top of Chromium, since the license requires that they keep all copyright lines intact. The compromise was to create an AUTHORS file that would list all of the copyright holders. The LICENSE file and source file headers would then include that list by reference, listing the copyright holder as "The Chromium Authors". This also become cumbersome to simply keep the file up to date with a high rate of new contributors. Plus it's not always obvious who the copyright holder is. Sometimes it is the individual making the contribution, but many times it may be their employer. There is no way for the proejct maintainer to know. Eventually, Google changed their policy to no longer recommend trying to keep the AUTHORS file up to date proactively, and instead to only add to it when requested: https://opensource.google/docs/releasing/authors. They are also clear that: > Adding contributors to the AUTHORS file is entirely within the > project's discretion and has no implications for copyright ownership. It was primarily added to appease a small number of large contributors that insisted that they be recognized as copyright holders (which was entirely their right to do). But it's not truly necessary, and not even the most accurate way of identifying contributors and/or copyright holders. In practice, we've never added anyone to our AUTHORS file. It only lists Tailscale, so it's not really serving any purpose. It also causes confusion because Tailscalars put the "Tailscale Inc & AUTHORS" header in other open source repos which don't actually have an AUTHORS file, so it's ambiguous what that means. Instead, we just acknowledge that the contributors to Tailscale (whoever they are) are copyright holders for their individual contributions. We also have the benefit of using the DCO (developercertificate.org) which provides some additional certification of their right to make the contribution. The source file changes were purely mechanical with: git ls-files | xargs sed -i -e 's/\(Tailscale Inc &\) AUTHORS/\1 contributors/g' Updates #cleanup Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d Signed-off-by: Will Norris <will@tailscale.com>	3 months ago
James Tucker	e8f1721147	syncs: add ShardedInt expvar.Var type ... ShardedInt provides an int type expvar.Var that supports more efficient writes at high frequencies (one order of magnigude on an M1 Max, much more on NUMA systems). There are two implementations of ShardValue, one that abuses sync.Pool that will work on current public Go versions, and one that takes a dependency on a runtime.TailscaleP function exposed in Tailscale's Go fork. The sync.Pool variant has about 10x the throughput of a single atomic integer on an M1 Max, and the runtime.TailscaleP variant is about 10x faster than the sync.Pool variant. Neither variant have perfect distribution, or perfectly always avoid cross-CPU sharing, as there is no locking or affinity to ensure that the time of yield is on the same core as the time of core biasing, but in the average case the distributions are enough to provide substantially better performance. See golang/go#18802 for a related upstream proposal. Updates tailscale/go#109 Updates tailscale/corp#25450 Signed-off-by: James Tucker <james@tailscale.com>	1 year ago