From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>,
linux-kernel@vger.kernel.org
Subject: [PATCH] perf: disable parallelism for 'make clean'
Date: Thu, 5 Jul 2018 15:15:27 +0200 [thread overview]
Message-ID: <20180705131527.19749-1-linux@rasmusvillemoes.dk> (raw)
The Yocto build system does a 'make clean' when rebuilding due to
changed dependencies, and that consistently fails for me (causing the
whole BSP build to fail) with errors such as
| find: '[...]/perf/1.0-r9/perf-1.0/plugin_mac80211.so': No such file or directory
| find: '[...]/perf/1.0-r9/perf-1.0/plugin_mac80211.so': No such file or directory
| find: find: '[...]/perf/1.0-r9/perf-1.0/libtraceevent.a''[...]/perf/1.0-r9/perf-1.0/libtraceevent.a': No such file or directory: No such file or directory
|
[...]
| find: cannot delete '/mnt/xfs/devel/pil/yocto/tmp-glibc/work/wandboard-oe-linux-gnueabi/perf/1.0-r9/perf-1.0/util/.pstack.o.cmd': No such file or directory
Apparently (despite the comment), 'make clean' ends up launching
multiple sub-makes that all want to remove the same things - perhaps
this only happens in combination with a O=... parameter. In any case, we
don't lose much by explicitly disabling the parallelism for the clean
target, and it makes automated builds much more reliable.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
Another option is to add -ignore_readdir_race to all find commands,
but that's a lot more invasive and only works properly together with
-delete with a very recent GNU find
(https://savannah.gnu.org/bugs/?52981).
tools/perf/Makefile | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 225454416ed5..7902a5681fc8 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -84,10 +84,10 @@ endif # has_clean
endif # MAKECMDGOALS
#
-# The clean target is not really parallel, don't print the jobs info:
+# Explicitly disable parallelism for the clean target.
#
clean:
- $(make)
+ $(make) -j1
#
# The build-test target is not really parallel, don't print the jobs info,
--
2.16.4
next reply other threads:[~2018-07-05 13:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-05 13:15 Rasmus Villemoes [this message]
2018-07-05 13:49 ` [PATCH] perf: disable parallelism for 'make clean' Jiri Olsa
2018-08-15 7:30 ` Rasmus Villemoes
2018-08-15 19:33 ` Arnaldo Carvalho de Melo
2018-08-23 8:37 ` [tip:perf/urgent] perf tools: Disable " tip-bot for Rasmus Villemoes
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