Hi Will, On Thu, 21 May 2020 18:35:22 +0100 Will Deacon <w...@kernel.org> wrote: > > [+Marco and Boris] > > On Fri, May 22, 2020 at 03:31:19AM +1000, Stephen Rothwell wrote: > > After merging the tip tree, all my linux-next builds took signficantly > > longer and used much more memory. In some cases, builds would seg fault > > due to running out of memory :-( > > > > I have eventaully bisected it to commit > > > > cdd28ad2d811 ("READ_ONCE: Use data_race() to avoid KCSAN instrumentation") > > > > For my (e.g.) x86_64 allmodconfig builds (cross compiled on PowerPC le, > > -j80) the elapsed time went from around 9 minutes to over 17 minutes > > and the maximum resident size (as reported by /usr/bin/time) from around > > 500M to around 2G (I saw lots of cc1 processes over 2G in size). > > > > For tomorrow's linux-next (well, later today :-() I will revert that > > commit (and its child) when I merge the tip tree. > > Sorry about that, seems we can't avoid running into compiler problems with > this lot. The good news is that there's a series to fix this here: > > https://lore.kernel.org/r/20200521142047.169334-1-el...@google.com > > so hopefully this be fixed in -tip soon (but I agree that reverting the > thing in -next in the meantime makes sense).
Unfortunately, the revert didn't work, so instead I have used the tip tree from next-20200518 for today (hopefully this will all be sorted out by Monday). -- Cheers, Stephen Rothwell
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