lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-29 11:41:21 +03:00
Code Activity

linux: Use sched_getaffinity for __get_nprocs (BZ #27645)

Browse Source 
Both the sysfs and procfs parsing (through GET_NPROCS_PARSER) are
removed in favor the syscall.  The initial scratch buffer should
fit to most of the common usage (1024 bytes with maps to 8192 CPUs).

Checked on x86_64-linux-gnu and aarch64-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2021-03-25 09:30:07 -03:00
parent db373e4c57
commit 903bc7dcc2
8 changed files with 30 additions and 337 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
sysdeps/unix/sysv/linux/sparc/getsysstats.c
View File

@ -19,23 +19,6 @@
<https://www.gnu.org/licenses/>. */
/* We need to define a special parser for /proc/cpuinfo. */
#define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
do \
{ \
(RESULT) = 0; \
/* Find the line that contains the information about the number of \
active cpus. We don't have to fear extremely long lines since \
the kernel will not generate them. 8192 bytes are really \
enough. */ \
char *l; \
while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
if (sscanf (l, "ncpus active : %d", &(RESULT)) == 1) \
break; \
} \
while (0)
/* On the Sparc we can distinguish between the number of configured and
active cpus. */
#define GET_NPROCS_CONF_PARSER(FP, BUFFER, RESULT) \