Enable lock elision again on s390 and s390x
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18
glibc.spec
18
glibc.spec
@ -23,6 +23,15 @@
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# to provide a more optimized version of the package for your arch.
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# to provide a more optimized version of the package for your arch.
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%define auxarches athlon alphaev6
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%define auxarches athlon alphaev6
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##############################################################################
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##############################################################################
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# Enable lock elision support for these architectures
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#
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# At the moment lock elision is disabled on x86_64 until there's a CPU that
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# would actually benefit from enabling it. Intel released a microcode update
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# to disable HLE and RTM at boot and the Fedora kernel now applies it early
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# enough that keeping lock elision enabled should be harmless, but we have
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# disabled it anyway as a conservative measure.
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%define lock_elision_arches s390 s390x
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##############################################################################
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# We build a special package for Xen that includes TLS support with
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# We build a special package for Xen that includes TLS support with
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# no negative segment offsets for use with Xen guests. This is
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# no negative segment offsets for use with Xen guests. This is
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# purely an optimization for increased performance on those arches.
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# purely an optimization for increased performance on those arches.
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@ -698,11 +707,6 @@ build()
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build_CFLAGS="$BuildFlags -g -O3 $*"
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build_CFLAGS="$BuildFlags -g -O3 $*"
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# Some configure checks can spuriously fail for some architectures if
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# Some configure checks can spuriously fail for some architectures if
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# unwind info is present
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# unwind info is present
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#
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# At the moment lock elision is temporarily disabled until we work
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# out how to update the microcode in early boot to prevent the cpuid
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# results from becoming stale. Once this is fixed add back:
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# --enable-lock-elision \
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configure_CFLAGS="$build_CFLAGS -fno-asynchronous-unwind-tables"
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configure_CFLAGS="$build_CFLAGS -fno-asynchronous-unwind-tables"
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../configure CC="$GCC" CXX="$GXX" CFLAGS="$configure_CFLAGS" \
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../configure CC="$GCC" CXX="$GXX" CFLAGS="$configure_CFLAGS" \
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--prefix=%{_prefix} \
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--prefix=%{_prefix} \
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@ -718,6 +722,9 @@ build()
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%endif
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%endif
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%ifarch ppc64p7
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%ifarch ppc64p7
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--with-cpu=power7 \
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--with-cpu=power7 \
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%endif
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%ifarch %{lock_elision_arches}
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--enable-lock-elision \
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%endif
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%endif
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--disable-profile --enable-nss-crypt ||
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--disable-profile --enable-nss-crypt ||
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{ cat config.log; false; }
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{ cat config.log; false; }
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@ -1728,6 +1735,7 @@ rm -f *.filelist*
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%changelog
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%changelog
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* Tue Sep 30 2014 Siddhesh Poyarekar <siddhesh@redhat.com> - 2.20.90-6
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* Tue Sep 30 2014 Siddhesh Poyarekar <siddhesh@redhat.com> - 2.20.90-6
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- Disable more Intel TSX usage in rwlocks (#1146967).
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- Disable more Intel TSX usage in rwlocks (#1146967).
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- Enable lock elision again on s390 and s390x.
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* Fri Sep 26 2014 Carlos O'Donell <carlos@redhat.com> - 2.20.90-5
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* Fri Sep 26 2014 Carlos O'Donell <carlos@redhat.com> - 2.20.90-5
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- Disable lock elision support for Intel hardware until microcode
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- Disable lock elision support for Intel hardware until microcode
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