On Tue, Nov 24, 2015 at 09:42:10AM +0100, Ingo Molnar wrote: SNIP
> > > > > > > > Occasionally it also triggers a build failure: > > > > > > CC plugin_kvm.o > > > CC arch/common.o > > > CC util/db-export.o > > > LD plugin_kmem-in.o > > > fixdep: error opening depfile: ./.plugin_kmem.o.d: No such file or > > > directory > > > /home/mingo/tip/tools/build/Makefile.build:77: recipe for target > > > 'plugin_kmem.o' > > > failed > > > make[3]: *** [plugin_kmem.o] Error 2 > > > Makefile:189: recipe for target 'plugin_kmem-in.o' failed > > > make[2]: *** [plugin_kmem-in.o] Error 2 > > > Makefile.perf:424: recipe for target 'install-traceevent-plugins' failed > > > make[1]: *** [install-traceevent-plugins] Error 2 > > > make[1]: *** Waiting for unfinished jobs.... > > > > > > that too seems to be a result of unwanted, over-eager parallelism. > > > > hm, haven't seen that one for long time now ;-) will check > > So maybe that's a side effect, because I do: > > make clean install > > and maybe 'clean' happens in parallel with 'install'? the fixdep error indicates that it was invoked after building object plugin_kmem-in.o, but it could not find its dep file (.plugin_kmem-in.o.d) which is built within the object build.. so seems like race with clean or other build of the same object however ;-) The 'Makefile' processing itself isn't paralel and will exec clean and install targets serialized: --- [root@intel-wildcatpass-07 perf]# make clean install make -f Makefile.perf --no-print-directory -j88 O= clean CLEAN libtraceevent CLEAN libapi CLEAN libbpf CLEAN config CLEAN core-objs CLEAN core-progs CLEAN core-gen SUBDIR Documentation CLEAN Documentation CLEAN python BUILD: Doing 'make -j88' parallel build make -f Makefile.perf --no-print-directory -j88 O= install Auto-detecting system features: ... dwarf: [ on ] ... glibc: [ on ] --- I can't make that failure on 88 cpus server, I assume you can reproduce this fairly easily? Could you please share failing build output from: $ make V=1 clean install thanks, jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
