From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1804) id 7C582385800D; Tue, 8 Feb 2022 22:34:08 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7C582385800D Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Dmitry Levin To: glibc-cvs@sourceware.org Subject: [glibc/release/2.35/master] linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ #28865] X-Act-Checkin: glibc X-Git-Author: Dmitry V. Levin X-Git-Refname: refs/heads/release/2.35/master X-Git-Oldrev: 24962427071fa532c3c48c918e9d64d719cc8a6c X-Git-Newrev: 491f2ef1f0ff849490f374917957018d07ee0586 Message-Id: <20220208223408.7C582385800D@sourceware.org> Date: Tue, 8 Feb 2022 22:34:08 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Feb 2022 22:34:08 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=491f2ef1f0ff849490f374917957018d07ee0586 commit 491f2ef1f0ff849490f374917957018d07ee0586 Author: Dmitry V. Levin Date: Sat Feb 5 08:00:00 2022 +0000 linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ #28865] get_nprocs() and get_nprocs_conf() use various methods to obtain an accurate number of processors. Re-introduce __get_nprocs_sched() as a source of information, and fix the order in which these methods are used to return the most accurate information. The primary source of information used in both functions remains unchanged. This also changes __get_nprocs_sched() error return value from 2 to 0, but all its users are already prepared to handle that. Old fallback order: get_nprocs: /sys/devices/system/cpu/online -> /proc/stat -> 2 get_nprocs_conf: /sys/devices/system/cpu/ -> /proc/stat -> 2 New fallback order: get_nprocs: /sys/devices/system/cpu/online -> /proc/stat -> sched_getaffinity -> 2 get_nprocs_conf: /sys/devices/system/cpu/ -> /proc/stat -> sched_getaffinity -> 2 Fixes: 342298278e ("linux: Revert the use of sched_getaffinity on get_nproc") Closes: BZ #28865 Reviewed-by: Adhemerval Zanella (cherry picked from commit e1d32b836410767270a3adf1f82b1a47e6e4cd51) Diff: --- NEWS | 2 + sysdeps/unix/sysv/linux/getsysstats.c | 94 +++++++++++++++++++++++------------ 2 files changed, 65 insertions(+), 31 deletions(-) diff --git a/NEWS b/NEWS index 6b8db4e947..04df0f4e8a 100644 --- a/NEWS +++ b/NEWS @@ -14,6 +14,8 @@ The following bugs are resolved with this release: (breaks test isolation) [28860] build: --enable-kernel=5.1.0 build fails because of missing __convert_scm_timestamps + [28865] linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are inaccurate + without /sys and /proc Version 2.35 diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c index c98c8ce3d4..d1ea074f0d 100644 --- a/sysdeps/unix/sysv/linux/getsysstats.c +++ b/sysdeps/unix/sysv/linux/getsysstats.c @@ -50,9 +50,8 @@ __get_nprocs_sched (void) is an arbitrary values assuming such systems should be rare and there is no offline cpus. */ return max_num_cpus; - /* Some other error. 2 is conservative (not a uniprocessor system, so - atomics are needed). */ - return 2; + /* Some other error. */ + return 0; } static char * @@ -108,22 +107,19 @@ next_line (int fd, char *const buffer, char **cp, char **re, } static int -get_nproc_stat (char *buffer, size_t buffer_size) +get_nproc_stat (void) { + enum { buffer_size = 1024 }; + char buffer[buffer_size]; char *buffer_end = buffer + buffer_size; char *cp = buffer_end; char *re = buffer_end; - - /* Default to an SMP system in case we cannot obtain an accurate - number. */ - int result = 2; + int result = 0; const int flags = O_RDONLY | O_CLOEXEC; int fd = __open_nocancel ("/proc/stat", flags); if (fd != -1) { - result = 0; - char *l; while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL) /* The current format of /proc/stat has all the cpu* entries @@ -139,8 +135,8 @@ get_nproc_stat (char *buffer, size_t buffer_size) return result; } -int -__get_nprocs (void) +static int +get_nprocs_cpu_online (void) { enum { buffer_size = 1024 }; char buffer[buffer_size]; @@ -179,7 +175,8 @@ __get_nprocs (void) } } - result += m - n + 1; + if (m >= n) + result += m - n + 1; l = endp; if (l < re && *l == ',') @@ -188,28 +185,18 @@ __get_nprocs (void) while (l < re && *l != '\n'); __close_nocancel_nostatus (fd); - - if (result > 0) - return result; } - return get_nproc_stat (buffer, buffer_size); + return result; } -libc_hidden_def (__get_nprocs) -weak_alias (__get_nprocs, get_nprocs) - -/* On some architectures it is possible to distinguish between configured - and active cpus. */ -int -__get_nprocs_conf (void) +static int +get_nprocs_cpu (void) { - /* Try to use the sysfs filesystem. It has actual information about - online processors. */ + int count = 0; DIR *dir = __opendir ("/sys/devices/system/cpu"); if (dir != NULL) { - int count = 0; struct dirent64 *d; while ((d = __readdir64 (dir)) != NULL) @@ -224,12 +211,57 @@ __get_nprocs_conf (void) __closedir (dir); - return count; } + return count; +} - enum { buffer_size = 1024 }; - char buffer[buffer_size]; - return get_nproc_stat (buffer, buffer_size); +static int +get_nprocs_fallback (void) +{ + int result; + + /* Try /proc/stat first. */ + result = get_nproc_stat (); + if (result != 0) + return result; + + /* Try sched_getaffinity. */ + result = __get_nprocs_sched (); + if (result != 0) + return result; + + /* We failed to obtain an accurate number. Be conservative: return + the smallest number meaning that this is not a uniprocessor system, + so atomics are needed. */ + return 2; +} + +int +__get_nprocs (void) +{ + /* Try /sys/devices/system/cpu/online first. */ + int result = get_nprocs_cpu_online (); + if (result != 0) + return result; + + /* Fall back to /proc/stat and sched_getaffinity. */ + return get_nprocs_fallback (); +} +libc_hidden_def (__get_nprocs) +weak_alias (__get_nprocs, get_nprocs) + +/* On some architectures it is possible to distinguish between configured + and active cpus. */ +int +__get_nprocs_conf (void) +{ + /* Try /sys/devices/system/cpu/ first. */ + int result = get_nprocs_cpu (); + if (result != 0) + return result; + + /* Fall back to /proc/stat and sched_getaffinity. */ + return get_nprocs_fallback (); } libc_hidden_def (__get_nprocs_conf) weak_alias (__get_nprocs_conf, get_nprocs_conf)