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Re: [patch] Ignore non relobj files in gc
- From: Rafael EspÃndola <rafael dot espindola at gmail dot com>
- To: Cary Coutant <ccoutant at gmail dot com>
- Cc: Binutils <binutils at sourceware dot org>, Sriraman Tallam <tmsriram at google dot com>
- Date: Mon, 27 Apr 2015 18:02:55 -0400
- Subject: Re: [patch] Ignore non relobj files in gc
- Authentication-results: sourceware.org; auth=none
- References: <CAG3jReKWtG9v9VR4JTs-8VzeN-OqURA_ZOSQo=+bu=gnkxrGpQ at mail dot gmail dot com> <CAJimCsFzvW5u1BefoXZm79exW2=3kf+cHOH96DntfXouL-CCFw at mail dot gmail dot com>
On 27 April 2015 at 16:17, Cary Coutant <ccoutant@gmail.com> wrote:
>> If a relocation points to a dynamic object we can ignore it, since we
>> cannot gc an already existing .so file.
>>
>> The attached patch produces an identical chromium binary, but does so
>> a bit faster (see the attached perf logs).
>
> I'd think the one-line patch below accomplishes the same result with
> much less disruption:
>
> @@ -340,7 +341,7 @@ gc_process_relocs(
> src_obj));
> }
>
> - if (gsym->source() != Symbol::FROM_OBJECT)
> + if (dst_obj == NULL || dst_obj->is_dynamic())
> continue;
> if (!is_ordinary)
> continue;
What about the attached compromise patch? It changes the type of just
the local variable.
>> Using Relobj also helps me in my patch for gcing parts of SHF_MERGE sections.
>
> If that's the case, let's move those changes to a separate patch.
> Nevertheless, I think it would be cleaner to change Section_id to use
> a Relobj* directly. That has some cascading effects, but doesn't
> affect quite as much target-independent code, and we really never need
> a Section_id that refers to a non-relocatable object. The attached
> patch does that.
It is nicer. I started the patch trying it, hit the icf code and
backed out a bit.
Cheers,
Rafael
2015-04-27 Rafael Ãvila de EspÃndola <rafael.espindola@gmail.com>
* gc.h (gc_process_relocs): Ignore non relobj files in gc.
diff --git a/gold/gc.h b/gold/gc.h
index bf4023d..8f47e9c 100644
--- a/gold/gc.h
+++ b/gold/gc.h
@@ -229,7 +229,7 @@ gc_process_relocs(
unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
typename elfcpp::Elf_types<size>::Elf_Swxword addend =
Reloc_types<sh_type, size, big_endian>::get_reloc_addend_noerror(&reloc);
- Object* dst_obj;
+ Relobj* dst_obj;
unsigned int dst_indx;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
Address dst_off;
@@ -291,7 +291,10 @@ gc_process_relocs(
bool is_ordinary = false;
if (gsym->source() == Symbol::FROM_OBJECT)
{
- dst_obj = gsym->object();
+ Object* obj = gsym->object();
+ dst_obj = (obj && !obj->is_dynamic())
+ ? static_cast<Relobj*>(obj)
+ : NULL;
dst_indx = gsym->shndx(&is_ordinary);
}
dst_off = static_cast<const Sized_symbol<size>*>(gsym)->value();
@@ -340,7 +343,7 @@ gc_process_relocs(
src_obj));
}
- if (gsym->source() != Symbol::FROM_OBJECT)
+ if (dst_obj == NULL)
continue;
if (!is_ordinary)
continue;
Performance counter stats for '/home/espindola/binutils/ld-master -pie --hash-style=gnu --no-add-needed --build-id --gc-sections --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o chrome /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtbeginS.o -L. -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../.. -L/home/espindola/llvm/build-227431/bin/../lib -L/lib -L/usr/lib -z now -z relro --fatal-warnings -z defs -z noexecstack --disable-new-dtags --export-dynamic -uIsHeapProfilerRunning -uProfilerStart -u_Z21InitialMallocHook_NewPKvj -u_Z22InitialMallocHook_MMapPKvS0_jiiix -u_Z22InitialMallocHook_SbrkPKvi -u_Z21InitialMallocHook_NewPKvm -u_Z22InitialMallocHook_MMapPKvS0_miiil -u_Z22InitialMallocHook_SbrkPKvl -u_ZN15HeapLeakChecker12IgnoreObjectEPKv -u_ZN15HeapLeakChecker14UnIgnoreObjectEPKv -O1 --as-needed --start-group obj/chrome/app/chrome_initial.chrome_exe_main_aura.o obj/content/public/common/chrome_initial.content_switches.o obj/chrome/app/chrome_initial.chrome_main.o obj/chrome/app/chrome_initial.chrome_main_delegate.o obj/chrome/libcommon.a obj/chrome/libbrowser.a obj/chrome/libdebugger.a obj/ppapi/libppapi_host.a obj/printing/libprinting.a obj/chrome/libservice.a obj/chrome/libplugin.a obj/chrome/librenderer.a obj/chrome/libutility.a obj/content/libcontent_gpu.a obj/content/libcontent_ppapi_plugin.a obj/components/nacl/renderer/plugin/libnacl_trusted_plugin.a obj/remoting/libremoting_client_plugin.a obj/content/libcontent_app_both.a obj/chrome/libinstaller_util.a obj/base/allocator/liballocator.a obj/components/libstartup_metric_utils.a obj/chrome/libcommon_net.a obj/base/libbase.a obj/base/libbase_static.a obj/base/allocator/liballocator_extension_thunks.a 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/usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crtn.o' (30 runs):
6266.418053 task-clock (msec) # 0.999 CPUs utilized ( +- 0.14% )
3 context-switches # 0.001 K/sec ( +- 5.67% )
0 cpu-migrations # 0.000 K/sec
266,961 page-faults # 0.043 M/sec
18,991,193,057 cycles # 3.031 GHz ( +- 0.03% )
8,754,914,020 stalled-cycles-frontend # 46.10% frontend cycles idle ( +- 0.07% )
0 stalled-cycles-backend # 0.00% backend cycles idle
26,661,647,167 instructions # 1.40 insns per cycle
# 0.33 stalled cycles per insn ( +- 0.00% )
5,352,541,077 branches # 854.163 M/sec ( +- 0.00% )
83,395,775 branch-misses # 1.56% of all branches ( +- 0.00% )
6.270806416 seconds time elapsed ( +- 0.14% )
Performance counter stats for '/home/espindola/binutils/ld-patch -pie --hash-style=gnu --no-add-needed --build-id --gc-sections --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o chrome /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtbeginS.o -L. -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../.. -L/home/espindola/llvm/build-227431/bin/../lib -L/lib -L/usr/lib -z now -z relro --fatal-warnings -z defs -z noexecstack --disable-new-dtags --export-dynamic -uIsHeapProfilerRunning -uProfilerStart -u_Z21InitialMallocHook_NewPKvj -u_Z22InitialMallocHook_MMapPKvS0_jiiix -u_Z22InitialMallocHook_SbrkPKvi -u_Z21InitialMallocHook_NewPKvm -u_Z22InitialMallocHook_MMapPKvS0_miiil -u_Z22InitialMallocHook_SbrkPKvl 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obj/native_client/src/trusted/validator_x86/libnccopy_x86_64.a obj/native_client/src/trusted/service_runtime/libnacl_signal.a obj/chrome/libsafe_browsing_chunk_proto.a obj/chrome/libsafe_browsing_report_proto.a obj/ash/libash_with_content.a obj/components/libconstrained_window.a obj/components/libweb_modal.a obj/extensions/components/libnative_app_window.a obj/extensions/libextensions_browser.a obj/components/libcopresence_endpoints.a obj/components/libkeyed_service_content.a obj/components/libuser_prefs.a obj/components/libsessions_content.a obj/components/libstorage_monitor.a obj/device/media_transfer_protocol/libdevice_media_transfer_protocol.a obj/device/media_transfer_protocol/libmtp_file_entry_proto.a obj/device/media_transfer_protocol/libmtp_storage_info_proto.a obj/components/libweb_cache_browser.a obj/components/libweb_cache_common.a obj/device/serial/libdevice_serial.a obj/extensions/browser/api/libextensions_api_registration.a obj/extensions/common/api/libcast_channel_proto.a obj/chrome/browser/ui/libgtk2ui/libgtk2ui.a obj/third_party/libaddressinput/libaddressinput.a obj/third_party/libaddressinput/libaddressinput_util.a obj/chrome/libbrowser_extensions.a obj/chrome/browser/extensions/api/libchrome_api_registration.a obj/components/libcopresence_proto.a obj/components/libcopresence.a obj/components/libproximity_auth.a obj/device/hid/libdevice_hid.a obj/device/core/libdevice_core.a obj/third_party/hunspell/libhunspell.a obj/extensions/components/libjavascript_dialog_extensions_client.a obj/chrome/libprobe_message_proto.a obj/components/libautofill_core_browser.a obj/third_party/fips181/libfips181.a obj/third_party/libphonenumber/libphonenumber.a obj/third_party/libphonenumber/libphonenumber_without_metadata.a obj/components/libinfobars_core.a obj/components/libbookmarks_browser.a obj/components/libfavicon_base.a obj/components/libquery_parser.a obj/components/libcaptive_portal.a obj/components/libdata_reduction_proxy_core_browser.a obj/components/libdata_reduction_proxy_core_common.a obj/components/libdomain_reliability.a obj/components/libenhanced_bookmarks.a obj/components/libenhanced_bookmarks_proto.a obj/components/libfavicon_core.a obj/components/libfeedback_component.a obj/components/libgoogle_core_browser.a obj/components/liburl_fixer.a obj/components/libhistory_core_browser.a obj/components/libhistory_core_common.a obj/components/libmetrics_gpu.a obj/components/libmetrics_net.a obj/components/libmetrics_profiler.a obj/components/libnavigation_metrics.a obj/components/libnetwork_time.a obj/components/libomnibox.a obj/components/libsearch.a obj/components/libsearch_engines.a obj/components/librappor.a obj/components/search_engines/libprepopulated_engines.a obj/components/libvariations_http_provider.a obj/components/libpolicy_component_browser.a obj/components/libprecache_core.a obj/components/libprecache_core_proto.a obj/components/librenderer_context_menu.a obj/components/libsearch_provider_logos.a obj/components/libsuggestions.a obj/components/libsync_driver.a obj/components/libtranslate_core_browser.a obj/components/liblanguage_usage_metrics.a obj/components/libwebdata_services.a obj/chrome/libapps.a obj/components/libautofill_content_browser.a obj/components/libdom_distiller_content.a obj/components/libhistory_content_browser.a obj/components/libnavigation_interception.a obj/components/libpacked_ct_ev_whitelist.a obj/components/libpassword_manager_content_browser.a obj/components/libpower.a obj/components/libprecache_content.a obj/components/libtranslate_content_browser.a obj/components/libvisitedlink_browser.a obj/components/libweb_resource.a obj/net/libnet_extras.a obj/testing/perf/libperf_test.a obj/chrome/libsync_file_system_drive_proto.a obj/components/libcryptauth.a obj/components/libcryptauth_proto.a obj/components/libnacl_browser.a obj/chrome/libpolicy_path_parser.a obj/components/libpdf_browser.a obj/components/libpdf_common.a obj/chrome/libsafe_browsing_metadata_proto.a obj/build/linux/libspeechd.a obj/components/libbreakpad_host.a obj/components/libcrash_component.a obj/components/libcrash_component_lib.a obj/breakpad/libbreakpad_client.a obj/components/libautofill_content_renderer.a obj/components/libcdm_renderer.a obj/components/libcdm_common.a obj/components/libnetwork_hints_renderer.a obj/components/liberror_page_renderer.a obj/components/libpassword_manager_content_renderer.a obj/components/libplugins_renderer.a obj/components/libtranslate_content_renderer.a obj/components/libvisitedlink_renderer.a obj/components/libweb_cache_renderer.a obj/components/libnacl.a obj/mojo/libmonacl_syscall.a obj/components/libnacl_renderer.a obj/native_client/src/trusted/nonnacl_util/libsel_ldr_launcher_base.a obj/native_client/src/shared/serialization/libserialization.a obj/ppapi/libppapi_cpp_objects.a obj/ppapi/libppapi_internal_module.a obj/third_party/jsoncpp/libjsoncpp.a obj/components/libpdf_renderer.a obj/third_party/smhasher/libmurmurhash3.a obj/extensions/libextensions_renderer.a obj/media/cast/libcast_sender.a obj/components/libprinting_renderer.a obj/extensions/libextensions_utility.a obj/third_party/cld_2/libcld2_static.a obj/remoting/libremoting_base.a obj/remoting/proto/libchromotocol_proto_lib.a obj/remoting/libremoting_client.a obj/remoting/libremoting_protocol.a --end-group -lrt -ldl -lgmodule-2.0 -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lsmime3 -lnss3 -lnssutil3 -lplds4 -lplc4 -lnspr4 -lpthread -lgconf-2 -lgio-2.0 -lresolv -lfontconfig -lfreetype -lpangocairo-1.0 -lcairo -lpangoft2-1.0 -lpango-1.0 -lharfbuzz -lX11 -lXi -lXcursor -lXext -lXfixes -lXrender -lXss -lXcomposite -lasound -lm -lXdamage -lXtst -lXrandr -lexpat -lcups -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lz -lcrypt -ldbus-1 -lcap -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lstdc++ -lm -lgcc_s -lgcc -lpthread -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-redhat-linux/4.9.2/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/4.9.2/../../../../lib64/crtn.o' (30 runs):
6107.134141 task-clock (msec) # 0.999 CPUs utilized ( +- 0.17% )
3 context-switches # 0.000 K/sec ( +- 6.02% )
0 cpu-migrations # 0.000 K/sec ( +-100.00% )
265,306 page-faults # 0.043 M/sec
18,526,275,665 cycles # 3.034 GHz ( +- 0.04% )
8,848,225,267 stalled-cycles-frontend # 47.76% frontend cycles idle ( +- 0.08% )
0 stalled-cycles-backend # 0.00% backend cycles idle
26,469,971,796 instructions # 1.43 insns per cycle
# 0.33 stalled cycles per insn ( +- 0.00% )
5,300,395,447 branches # 867.902 M/sec ( +- 0.00% )
68,369,538 branch-misses # 1.29% of all branches ( +- 0.00% )
6.111418219 seconds time elapsed ( +- 0.17% )