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authorBruce Ashfield <bruce.ashfield@windriver.com>2013-09-18 18:09:54 +0000
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-09-18 19:49:41 +0100
commit4ed858bc765ec6f354731f6c6777b07ce51b4792 (patch)
tree6004c2cb1285b0c8d03b0f9a335ab0c978320e46 /scripts/runqemu.README
parent2ad268ff8e464929c84577a8eb8d0458f2351a2e (diff)
downloadpoky-1.5_M5.rc3.tar.gz
linux-yocto/3.10: fix long perf compile times1.5_M5.rc3
perf's builtin-sched.c triggers extremly long build times on some architectures due to gcc 4.7+ var-tracking functionality. To fix this, we can cherry pick the 3.12 commit: f36f83f94 [perf sched: Move struct perf_sched definition out of cmd_sched()] With this change build times are reduced from 15 to 20 minutes for qemuarm to: real 2m19.940s user 1m35.438s sys 0m11.165s For kernel's that are not carrying this patch, the following can be added to the perf recipe to also fix the issue: +++ b/meta/recipes-kernel/perf/perf.bb @@ -68,6 +68,7 @@ EXTRA_OEMAKE = \ CC="${CC}" \ AR="${AR}" \ perfexecdir=${libexecdir} \ + EXTRA_CFLAGS="-fno-var-tracking" \ NO_GTK2=1 ${TUI_DEFINES} NO_DWARF=1 ${SCRIPTING_DEFINES} \ (From OE-Core rev: 82ad5305381c2f541ef051a8fc28243cd91776fe) Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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