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From e870aac8974cda746157a5a3c9f452ccd70da29b Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon, 6 Sep 2021 12:22:54 -0300
Subject: [PATCH] misc: Add __get_nprocs_sched
This is an internal function meant to return the number of avaliable
processor where the process can scheduled, different than the
__get_nprocs which returns a the system available online CPU.
The Linux implementation currently only calls __get_nprocs(), which
in tuns calls sched_getaffinity.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit 11a02b035b464ab6813676adfd19c4a59c36d907)
---
include/sys/sysinfo.h | 7 ++++++-
malloc/arena.c | 2 +-
misc/getsysstats.c | 6 ++++++
sysdeps/mach/getsysstats.c | 6 ++++++
sysdeps/unix/sysv/linux/getsysstats.c | 6 ++++++
5 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/include/sys/sysinfo.h b/include/sys/sysinfo.h
index 7388356..c490561 100644
--- a/include/sys/sysinfo.h
+++ b/include/sys/sysinfo.h
@@ -9,10 +9,15 @@
extern int __get_nprocs_conf (void);
libc_hidden_proto (__get_nprocs_conf)
-/* Return number of available processors. */
+/* Return number of available processors (not all of them will be
+ available to the caller process). */
extern int __get_nprocs (void);
libc_hidden_proto (__get_nprocs)
+/* Return the number of available processors which the process can
+ be scheduled. */
+extern int __get_nprocs_sched (void) attribute_hidden;
+
/* Return number of physical pages of memory in the system. */
extern long int __get_phys_pages (void);
libc_hidden_proto (__get_phys_pages)
diff --git a/malloc/arena.c b/malloc/arena.c
index 6674846..f1f0af8 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -879,7 +879,7 @@ arena_get2 (size_t size, mstate avoid_arena)
narenas_limit = mp_.arena_max;
else if (narenas > mp_.arena_test)
{
- int n = __get_nprocs ();
+ int n = __get_nprocs_sched ();
if (n >= 1)
narenas_limit = NARENAS_FROM_NCORES (n);
diff --git a/misc/getsysstats.c b/misc/getsysstats.c
index 0eedfac..57d9360 100644
--- a/misc/getsysstats.c
+++ b/misc/getsysstats.c
@@ -45,6 +45,12 @@ weak_alias (__get_nprocs, get_nprocs)
link_warning (get_nprocs, "warning: get_nprocs will always return 1")
+int
+__get_nprocs_sched (void)
+{
+ return 1;
+}
+
long int
__get_phys_pages (void)
{
diff --git a/sysdeps/mach/getsysstats.c b/sysdeps/mach/getsysstats.c
index 1267f39..cc8023f 100644
--- a/sysdeps/mach/getsysstats.c
+++ b/sysdeps/mach/getsysstats.c
@@ -62,6 +62,12 @@ __get_nprocs (void)
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
+int
+__get_nprocs_sched (void)
+{
+ return __get_nprocs ();
+}
+
/* Return the number of physical pages on the system. */
long int
__get_phys_pages (void)
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
index 1391e36..120ce1b 100644
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ b/sysdeps/unix/sysv/linux/getsysstats.c
@@ -88,6 +88,12 @@ __get_nprocs (void)
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
+int
+__get_nprocs_sched (void)
+{
+ return __get_nprocs ();
+}
+
/* On some architectures it is possible to distinguish between configured
and active cpus. */
--
1.8.3.1
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