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commit e870aac8974cda746157a5a3c9f452ccd70da29b
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Mon Sep 6 12:22:54 2021 -0300
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misc: Add __get_nprocs_sched
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This is an internal function meant to return the number of avaliable
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processor where the process can scheduled, different than the
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__get_nprocs which returns a the system available online CPU.
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The Linux implementation currently only calls __get_nprocs(), which
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in tuns calls sched_getaffinity.
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Reviewed-by: Florian Weimer <fweimer@redhat.com>
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(cherry picked from commit 11a02b035b464ab6813676adfd19c4a59c36d907)
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diff --git a/include/sys/sysinfo.h b/include/sys/sysinfo.h
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index 7388356a19269335..c490561581733038 100644
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--- a/include/sys/sysinfo.h
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+++ b/include/sys/sysinfo.h
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@@ -9,10 +9,15 @@
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extern int __get_nprocs_conf (void);
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libc_hidden_proto (__get_nprocs_conf)
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-/* Return number of available processors. */
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+/* Return number of available processors (not all of them will be
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+ available to the caller process). */
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extern int __get_nprocs (void);
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libc_hidden_proto (__get_nprocs)
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+/* Return the number of available processors which the process can
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+ be scheduled. */
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+extern int __get_nprocs_sched (void) attribute_hidden;
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+
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/* Return number of physical pages of memory in the system. */
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extern long int __get_phys_pages (void);
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libc_hidden_proto (__get_phys_pages)
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diff --git a/malloc/arena.c b/malloc/arena.c
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index 667484630ed0afa5..f1f0af86489d0063 100644
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--- a/malloc/arena.c
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+++ b/malloc/arena.c
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@@ -879,7 +879,7 @@ arena_get2 (size_t size, mstate avoid_arena)
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narenas_limit = mp_.arena_max;
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else if (narenas > mp_.arena_test)
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{
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- int n = __get_nprocs ();
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+ int n = __get_nprocs_sched ();
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if (n >= 1)
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narenas_limit = NARENAS_FROM_NCORES (n);
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diff --git a/misc/getsysstats.c b/misc/getsysstats.c
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index 0eedface6d2b0f75..57d93601e21265d7 100644
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--- a/misc/getsysstats.c
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+++ b/misc/getsysstats.c
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@@ -45,6 +45,12 @@ weak_alias (__get_nprocs, get_nprocs)
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link_warning (get_nprocs, "warning: get_nprocs will always return 1")
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+int
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+__get_nprocs_sched (void)
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+{
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+ return 1;
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+}
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+
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long int
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__get_phys_pages (void)
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{
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diff --git a/sysdeps/mach/getsysstats.c b/sysdeps/mach/getsysstats.c
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index 1267f39da26aee38..cc8023f979bf6f74 100644
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--- a/sysdeps/mach/getsysstats.c
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+++ b/sysdeps/mach/getsysstats.c
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@@ -62,6 +62,12 @@ __get_nprocs (void)
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libc_hidden_def (__get_nprocs)
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weak_alias (__get_nprocs, get_nprocs)
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+int
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+__get_nprocs_sched (void)
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+{
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+ return __get_nprocs ();
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+}
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+
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/* Return the number of physical pages on the system. */
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long int
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__get_phys_pages (void)
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diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
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index 1391e360b8f8e86c..120ce1bb756b09cc 100644
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--- a/sysdeps/unix/sysv/linux/getsysstats.c
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+++ b/sysdeps/unix/sysv/linux/getsysstats.c
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@@ -88,6 +88,12 @@ __get_nprocs (void)
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libc_hidden_def (__get_nprocs)
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weak_alias (__get_nprocs, get_nprocs)
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+int
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+__get_nprocs_sched (void)
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+{
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+ return __get_nprocs ();
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+}
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+
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/* On some architectures it is possible to distinguish between configured
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and active cpus. */
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