Cache information in x86_64 ld.so --list-diagnostics output (RHEL-21997)
Resolves: RHEL-21997
This commit is contained in:
Florian Weimer
parent
d1cf4608a0
commit
d304f5706a
112
glibc-RHEL-21997.patch
Normal file
112
glibc-RHEL-21997.patch
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@ -0,0 +1,112 @@
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This downstream-only patch compensates for the missing backport of
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commit 2d651eb9265d1366d7b9e881bfddd46db9c1ecc4 ("x86: Move
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x86 processor cache info to cpu_features"). Without it,
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ld.so --list-diagnostics prints values that have not been properly
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initalized from CPUID data.
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diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
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index 10ebadd819d9efff..d8421fab83ab08ac 100644
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--- a/sysdeps/x86/cacheinfo.h
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+++ b/sysdeps/x86/cacheinfo.h
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@@ -19,31 +19,42 @@
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#include <assert.h>
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#include <unistd.h>
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+/* When building ld.so, do not export any of the variables. They are
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+ only used for diagnostics and are not initialized during regular
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+ operation. */
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+#if IS_IN (rtld)
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+# define CACHEINFO_VARIABLE(name, initializer) \
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+ static long int name = initializer
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+#else
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+# define CACHEINFO_VARIABLE(name, initializer) \
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+ long int name attribute_hidden = initializer
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+#endif
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+
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/* Data cache size for use in memory and string routines, typically
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L1 size, rounded to multiple of 256 bytes. */
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-long int __x86_data_cache_size_half attribute_hidden = 32 * 1024 / 2;
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-long int __x86_data_cache_size attribute_hidden = 32 * 1024;
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+CACHEINFO_VARIABLE (__x86_data_cache_size_half, 32 * 1024 / 2);
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+CACHEINFO_VARIABLE (__x86_data_cache_size, 32 * 1024);
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/* Similar to __x86_data_cache_size_half, but not rounded. */
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-long int __x86_raw_data_cache_size_half attribute_hidden = 32 * 1024 / 2;
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+CACHEINFO_VARIABLE (__x86_raw_data_cache_size_half, 32 * 1024 / 2);
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/* Similar to __x86_data_cache_size, but not rounded. */
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-long int __x86_raw_data_cache_size attribute_hidden = 32 * 1024;
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+CACHEINFO_VARIABLE (__x86_raw_data_cache_size, 32 * 1024);
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/* Shared cache size for use in memory and string routines, typically
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L2 or L3 size, rounded to multiple of 256 bytes. */
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-long int __x86_shared_cache_size_half attribute_hidden = 1024 * 1024 / 2;
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-long int __x86_shared_cache_size attribute_hidden = 1024 * 1024;
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+CACHEINFO_VARIABLE (__x86_shared_cache_size_half, 1024 * 1024 / 2);
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+CACHEINFO_VARIABLE (__x86_shared_cache_size, 1024 * 1024);
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/* Similar to __x86_shared_cache_size_half, but not rounded. */
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-long int __x86_raw_shared_cache_size_half attribute_hidden = 1024 * 1024 / 2;
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+CACHEINFO_VARIABLE (__x86_raw_shared_cache_size_half, 1024 * 1024 / 2);
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/* Similar to __x86_shared_cache_size, but not rounded. */
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-long int __x86_raw_shared_cache_size attribute_hidden = 1024 * 1024;
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+CACHEINFO_VARIABLE (__x86_raw_shared_cache_size, 1024 * 1024);
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/* Threshold to use non temporal store. */
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-long int __x86_shared_non_temporal_threshold attribute_hidden;
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+CACHEINFO_VARIABLE (__x86_shared_non_temporal_threshold, 0);
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/* Threshold to use Enhanced REP MOVSB. */
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-long int __x86_rep_movsb_threshold attribute_hidden = 2048;
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+CACHEINFO_VARIABLE (__x86_rep_movsb_threshold, 2048);
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/* Threshold to use Enhanced REP STOSB. */
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-long int __x86_rep_stosb_threshold attribute_hidden = 2048;
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+CACHEINFO_VARIABLE (__x86_rep_stosb_threshold, 2048);
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static void
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get_common_cache_info (long int *shared_ptr, long int * shared_per_thread_ptr, unsigned int *threads_ptr,
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diff --git a/sysdeps/x86/dl-diagnostics-cpu.c b/sysdeps/x86/dl-diagnostics-cpu.c
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index 0ba286a828b69937..9215604ecf22344c 100644
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--- a/sysdeps/x86/dl-diagnostics-cpu.c
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+++ b/sysdeps/x86/dl-diagnostics-cpu.c
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@@ -19,6 +19,13 @@
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#include <dl-diagnostics.h>
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#include <ldsodefs.h>
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+#include <assert.h>
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+#include <unistd.h>
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+#include <cpu-features.h>
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+#include <cpuid.h>
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+#include <dl-cacheinfo.h>
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+#include <cacheinfo.h>
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+
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static void
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print_cpu_features_value (const char *label, uint64_t value)
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{
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@@ -81,19 +88,21 @@ _dl_diagnostics_cpu (void)
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#include "cpu-features-preferred_feature_index_1.def"
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#undef BIT
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+ /* The cache information variables are only used for diagnostics and
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+ are not initialized during startup. The values used at run time
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+ are only in libc.so.6. */
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+ init_cacheinfo ();
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+
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print_cpu_features_value ("xsave_state_size",
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cpu_features->xsave_state_size);
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print_cpu_features_value ("xsave_state_full_size",
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cpu_features->xsave_state_full_size);
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- print_cpu_features_value ("data_cache_size", cpu_features->data_cache_size);
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- print_cpu_features_value ("shared_cache_size",
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- cpu_features->shared_cache_size);
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+ print_cpu_features_value ("data_cache_size", __x86_data_cache_size);
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+ print_cpu_features_value ("shared_cache_size", __x86_shared_cache_size);
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print_cpu_features_value ("non_temporal_threshold",
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- cpu_features->non_temporal_threshold);
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- print_cpu_features_value ("rep_movsb_threshold",
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- cpu_features->rep_movsb_threshold);
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- print_cpu_features_value ("rep_stosb_threshold",
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- cpu_features->rep_stosb_threshold);
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+ __x86_shared_non_temporal_threshold);
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+ print_cpu_features_value ("rep_movsb_threshold", __x86_rep_movsb_threshold);
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+ print_cpu_features_value ("rep_stosb_threshold", __x86_rep_stosb_threshold);
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_Static_assert (offsetof (struct cpu_features, rep_stosb_threshold)
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+ sizeof (cpu_features->rep_stosb_threshold)
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== sizeof (*cpu_features),
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@ -1,6 +1,6 @@
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%define glibcsrcdir glibc-2.28
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%define glibcversion 2.28
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%define glibcrelease 250%{?dist}
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%define glibcrelease 251%{?dist}
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# Pre-release tarballs are pulled in from git using a command that is
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# effectively:
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#
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@ -1182,6 +1182,7 @@ Patch994: glibc-RHEL-3010-1.patch
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Patch995: glibc-RHEL-3010-2.patch
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Patch996: glibc-RHEL-3010-3.patch
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Patch997: glibc-RHEL-19445.patch
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Patch998: glibc-RHEL-21997.patch
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##############################################################################
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# Continued list of core "glibc" package information:
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@ -3013,6 +3014,9 @@ fi
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%files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
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%changelog
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* Thu Jan 18 2024 Florian Weimer <fweimer@redhat.com> - 2.28-251
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- Cache information in x86_64 ld.so --list-diagnostics output (RHEL-21997)
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* Wed Jan 10 2024 Arjun Shankar <arjun@redhat.com> - 2.28-250
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- getaddrinfo: Return correct error EAI_MEMORY when out-of-memory (RHEL-19445)
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