On Mon, Dec 09, 2019 at 10:18:57AM -0800, Linus Torvalds wrote: > On Mon, Dec 9, 2019 at 9:57 AM Akemi Yagi <toracat@xxxxxxxxxx> wrote: > > > > In addition to the Fedora make-4.2.1-4.fc27 (1) mentioned by Linus, > > RHEL 8 make-4.2.1-9.el8 (2) is affected. The patch applied to Fedora > > make (3) has been confirmed to fix the issue in RHEL's make. > > > > Those are the only real-world examples I know of. I have no idea how > > widespread this thing is... > > Looks like opensuse and ubuntu are also on 4.2.1 according to > > https://software.opensuse.org/package/make > https://packages.ubuntu.com/cosmic/make > > so apparently the bug is almost universal with the big three sharing > this buggy version. Debian and Ubuntu have make 4.2.1-1.2, which includes "[SV 51159] Use a non-blocking read with pselect to avoid hangs." and various other fixes. https://metadata.ftp-master.debian.org/changelogs/main/m/make-dfsg/make-dfsg_4.2.1-1.2_changelog So, both Debian and Ubuntu should be fine with the pipe improvements. (I'm testing that now.) Is the version of your non-thundering-herd pipe wakeup patch attached to https://lore.kernel.org/lkml/CAHk-=wicgTacrHUJmSBbW9MYAdMPdrXzULPNqQ3G7+HkLeNf1Q@xxxxxxxxxxxxxx/ still the best version to test performance with?
