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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
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>
This commit is contained in:
Adhemerval Zanella 2021-09-06 12:22:54 -03:00
parent 514638699d
commit 11a02b035b
5 changed files with 25 additions and 2 deletions
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7
include/sys/sysinfo.h
View File

@ -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)

2
malloc/arena.c
View File

@ -878,7 +878,7 @@ 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);

6
misc/getsysstats.c
View File

@ -44,6 +44,12 @@ 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)
{

6
sysdeps/mach/getsysstats.c
View File

@ -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)

6
sysdeps/unix/sysv/linux/getsysstats.c
View File

@ -87,6 +87,12 @@ __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. */