2011-09-19 15:14:30 +00:00
|
|
|
'\" t
|
2012-03-08 21:15:58 +00:00
|
|
|
.\" Copyright (c) 2012 by Michael Kerrisk <mtk.manpages@gmail.com>
|
2011-09-19 15:14:30 +00:00
|
|
|
.\"
|
intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: s/LICENSE_START(verbatim)/LICENSE_START(VERBATIM)/
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:29:01 +00:00
|
|
|
.\" %%%LICENSE_START(VERBATIM)
|
2011-09-19 15:14:30 +00:00
|
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
|
|
.\" preserved on all copies.
|
|
|
|
.\"
|
|
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
|
|
.\" permission notice identical to this one.
|
|
|
|
.\"
|
|
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
|
|
.\" have taken the same level of care in the production of this manual,
|
|
|
|
.\" which is licensed free of charge, as they might when working
|
|
|
|
.\" professionally.
|
|
|
|
.\"
|
|
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: Global fix: Add LICENSE_START(verbatim)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:40 +00:00
|
|
|
.\" %%%LICENSE_END
|
2011-09-19 15:14:30 +00:00
|
|
|
.\"
|
2012-05-05 21:49:40 +00:00
|
|
|
.TH MALLINFO 3 2012-05-06 "Linux" "Linux Programmer's Manual"
|
2011-09-19 15:14:30 +00:00
|
|
|
.SH NAME
|
|
|
|
mallinfo \- obtain memory allocation information
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.B #include <malloc.h>
|
|
|
|
|
|
|
|
.B struct mallinfo mallinfo(void);
|
|
|
|
.SH DESCRIPTION
|
|
|
|
The
|
|
|
|
.BR mallinfo ()
|
|
|
|
function returns a copy of a structure containing information about
|
|
|
|
memory allocations performed by
|
|
|
|
.BR malloc (3)
|
|
|
|
and related functions.
|
|
|
|
This structure is defined as follows:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.nf
|
|
|
|
struct mallinfo {
|
|
|
|
int arena; /* Non-mmapped space allocated (bytes) */
|
|
|
|
int ordblks; /* Number of free chunks */
|
|
|
|
int smblks; /* Number of free fastbin blocks */
|
|
|
|
int hblks; /* Number of mmapped regions */
|
|
|
|
int hblkhd; /* Space allocated in mmapped regions (bytes) */
|
|
|
|
int usmblks; /* Maximum total allocated space (bytes) */
|
|
|
|
int fsmblks; /* Space in freed fastbin blocks (bytes) */
|
|
|
|
int uordblks; /* Total allocated space (bytes) */
|
|
|
|
int fordblks; /* Total free space (bytes) */
|
|
|
|
int keepcost; /* Top-most, releasable space (bytes) */
|
|
|
|
};
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
.PP
|
|
|
|
The fields of the
|
|
|
|
.I mallinfo
|
|
|
|
structure contain the following information:
|
|
|
|
.TP 10
|
|
|
|
.I arena
|
|
|
|
The total amount of memory allocated by means other than
|
|
|
|
.BR mmap (2)
|
|
|
|
(i.e., memory allocated on the heap).
|
|
|
|
This figure includes both in-use blocks and blocks on the free list.
|
|
|
|
.TP
|
|
|
|
.I ordblks
|
|
|
|
The number of ordinary (i.e., non-fastbin) free blocks.
|
|
|
|
.TP
|
|
|
|
.I smblks
|
|
|
|
The number of fastbin free blocks (see
|
|
|
|
.BR mallopt (3)).
|
|
|
|
.TP
|
|
|
|
.I hblks
|
|
|
|
The number of blocks currently allocated using
|
|
|
|
.BR mmap (2).
|
2012-05-05 21:49:40 +00:00
|
|
|
(See the discussion of
|
|
|
|
.B M_MMAP_THRESHOLD
|
|
|
|
in
|
|
|
|
.BR mallopt (3).)
|
2011-09-19 15:14:30 +00:00
|
|
|
.TP
|
|
|
|
.I hblkhd
|
|
|
|
The number of bytes in blocks currently allocated using
|
|
|
|
.BR mmap (2).
|
|
|
|
.TP
|
|
|
|
.I usmblks
|
|
|
|
The "highwater mark" for allocated space\(emthat is,
|
|
|
|
the maximum amount of space that was ever allocated.
|
|
|
|
This field is maintained only in nonthreading environments.
|
|
|
|
.TP
|
|
|
|
.I fsmblks
|
|
|
|
The total number of bytes in fastbin free blocks.
|
|
|
|
.TP
|
|
|
|
.I uordblks
|
|
|
|
The total number of bytes used by in-use allocations.
|
|
|
|
.TP
|
|
|
|
.I fordblks
|
|
|
|
The total number of bytes in free blocks.
|
|
|
|
.TP
|
|
|
|
.I keepcost
|
|
|
|
The total amount of releasable free space at the top
|
|
|
|
of the heap.
|
|
|
|
This is the maximum number of bytes that could ideally
|
|
|
|
(i.e., ignoring page alignment restrictions, and so on) be released by
|
|
|
|
.BR malloc_trim (3).
|
|
|
|
.\" .SH VERSIONS
|
|
|
|
.\" Available already in glibc 2.0, possibly earlier
|
|
|
|
.SH CONFORMING TO
|
|
|
|
This function is not specified by POSIX or the C standards.
|
|
|
|
A similar function exists on many System V derivatives,
|
|
|
|
and was specified in the SVID.
|
2012-02-26 23:10:28 +00:00
|
|
|
.SH BUGS
|
2012-04-26 23:16:40 +00:00
|
|
|
.\" FIXME http://sourceware.org/bugzilla/show_bug.cgi?id=208
|
2012-02-26 23:10:28 +00:00
|
|
|
.\" See the 24 Aug 2011 mail by Paul Pluzhnikov:
|
|
|
|
.\" "[patch] Fix mallinfo() to accumulate results for all arenas"
|
|
|
|
.\" on libc-alpha@sourceware.org
|
2012-03-08 21:15:58 +00:00
|
|
|
.B Information is returned for only the main memory allocation area.
|
|
|
|
Allocations in other arenas are excluded.
|
|
|
|
See
|
|
|
|
.BR malloc_stats (3)
|
|
|
|
and
|
|
|
|
.BR malloc_info (3)
|
|
|
|
for alternatives that include information about other arenas.
|
2012-02-26 23:10:28 +00:00
|
|
|
|
2011-09-19 15:14:30 +00:00
|
|
|
The fields of the
|
|
|
|
.I mallinfo
|
|
|
|
structure are typed as
|
|
|
|
.IR int .
|
|
|
|
However, because some internal bookkeeping values may be of type
|
|
|
|
.IR long ,
|
|
|
|
the reported values may wrap around zero and thus be inaccurate.
|
|
|
|
.SH EXAMPLE
|
|
|
|
The program below employs
|
|
|
|
.BR mallinfo ()
|
|
|
|
to retrieve memory allocation statistics before and after
|
|
|
|
allocating and freeing some blocks of memory.
|
|
|
|
The statistics are displayed on standard output.
|
|
|
|
|
|
|
|
The first two command-line arguments specify the number and size of
|
|
|
|
blocks to be allocated with
|
|
|
|
.BR malloc (3).
|
|
|
|
|
|
|
|
The remaining three arguments specify which of the allocated blocks
|
|
|
|
should be freed with
|
|
|
|
.BR free (3).
|
|
|
|
These three arguments are optional, and specify (in order):
|
|
|
|
the step size to be used in the loop that frees blocks
|
|
|
|
(the default is 1, meaning free all blocks in the range);
|
|
|
|
the ordinal position of the first block to be freed
|
|
|
|
(default 0, meaning the first allocated block);
|
|
|
|
and a number one greater than the ordinal position
|
|
|
|
of the last block to be freed
|
|
|
|
(default is one greater than the maximum block number).
|
|
|
|
If these three arguments are omitted,
|
|
|
|
then the defaults cause all allocated blocks to be freed.
|
|
|
|
|
|
|
|
In the following example run of the program,
|
|
|
|
1000 allocations of 100 bytes are performed,
|
|
|
|
and then every second allocated block is freed:
|
|
|
|
.PP
|
|
|
|
.in +4n
|
|
|
|
.nf
|
|
|
|
$ \fB./a.out 1000 100 2\fP
|
|
|
|
============== Before allocating blocks ==============
|
|
|
|
Total non\-mmapped bytes (arena): 0
|
|
|
|
# of free chunks (ordblks): 1
|
|
|
|
# of free fastbin blocks (smblks): 0
|
|
|
|
# of mapped regions (hblks): 0
|
|
|
|
Bytes in mapped regions (hblkhd): 0
|
|
|
|
Max. total allocated space (usmblks): 0
|
|
|
|
Free bytes held in fastbins (fsmblks): 0
|
|
|
|
Total allocated space (uordblks): 0
|
|
|
|
Total free space (fordblks): 0
|
|
|
|
Topmost releasable block (keepcost): 0
|
|
|
|
|
|
|
|
============== After allocating blocks ==============
|
|
|
|
Total non\-mmapped bytes (arena): 135168
|
|
|
|
# of free chunks (ordblks): 1
|
|
|
|
# of free fastbin blocks (smblks): 0
|
|
|
|
# of mapped regions (hblks): 0
|
|
|
|
Bytes in mapped regions (hblkhd): 0
|
|
|
|
Max. total allocated space (usmblks): 0
|
|
|
|
Free bytes held in fastbins (fsmblks): 0
|
|
|
|
Total allocated space (uordblks): 104000
|
|
|
|
Total free space (fordblks): 31168
|
|
|
|
Topmost releasable block (keepcost): 31168
|
|
|
|
|
|
|
|
============== After freeing blocks ==============
|
|
|
|
Total non\-mmapped bytes (arena): 135168
|
|
|
|
# of free chunks (ordblks): 501
|
|
|
|
# of free fastbin blocks (smblks): 0
|
|
|
|
# of mapped regions (hblks): 0
|
|
|
|
Bytes in mapped regions (hblkhd): 0
|
|
|
|
Max. total allocated space (usmblks): 0
|
|
|
|
Free bytes held in fastbins (fsmblks): 0
|
|
|
|
Total allocated space (uordblks): 52000
|
|
|
|
Total free space (fordblks): 83168
|
|
|
|
Topmost releasable block (keepcost): 31168
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
.SS Program source
|
|
|
|
\&
|
|
|
|
.nf
|
|
|
|
#include <malloc.h>
|
|
|
|
#include "tlpi_hdr.h"
|
|
|
|
|
|
|
|
static void
|
|
|
|
display_mallinfo(void)
|
|
|
|
{
|
|
|
|
struct mallinfo mi;
|
|
|
|
|
|
|
|
mi = mallinfo();
|
|
|
|
|
|
|
|
printf("Total non\-mmapped bytes (arena): %d\\n", mi.arena);
|
|
|
|
printf("# of free chunks (ordblks): %d\\n", mi.ordblks);
|
|
|
|
printf("# of free fastbin blocks (smblks): %d\\n", mi.smblks);
|
|
|
|
printf("# of mapped regions (hblks): %d\\n", mi.hblks);
|
|
|
|
printf("Bytes in mapped regions (hblkhd): %d\\n", mi.hblkhd);
|
|
|
|
printf("Max. total allocated space (usmblks): %d\\n", mi.usmblks);
|
|
|
|
printf("Free bytes held in fastbins (fsmblks): %d\\n", mi.fsmblks);
|
|
|
|
printf("Total allocated space (uordblks): %d\\n", mi.uordblks);
|
|
|
|
printf("Total free space (fordblks): %d\\n", mi.fordblks);
|
|
|
|
printf("Topmost releasable block (keepcost): %d\\n", mi.keepcost);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
|
|
|
{
|
|
|
|
#define MAX_ALLOCS 2000000
|
|
|
|
char *alloc[MAX_ALLOCS];
|
|
|
|
int numBlocks, j, freeBegin, freeEnd, freeStep;
|
|
|
|
size_t blockSize;
|
|
|
|
|
|
|
|
if (argc < 3 || strcmp(argv[1], "\-\-help") == 0)
|
|
|
|
usageErr("%s num\-blocks block\-size [free\-step [start\-free "
|
|
|
|
"[end\-free]]]\\n", argv[0]);
|
|
|
|
|
|
|
|
numBlocks = atoi(argv[1]);
|
|
|
|
blockSize = atoi(argv[2]);
|
|
|
|
freeStep = (argc > 3) ? atoi(argv[3]) : 1;
|
|
|
|
freeBegin = (argc > 4) ? atoi(argv[4]) : 0;
|
|
|
|
freeEnd = (argc > 5) ? atoi(argv[5]) : numBlocks;
|
|
|
|
|
|
|
|
printf("============== Before allocating blocks ==============\\n");
|
|
|
|
display_mallinfo();
|
|
|
|
|
|
|
|
for (j = 0; j < numBlocks; j++) {
|
|
|
|
if (numBlocks >= MAX_ALLOCS)
|
|
|
|
fatal("Too many allocations");
|
|
|
|
|
|
|
|
alloc[j] = malloc(blockSize);
|
|
|
|
if (alloc[j] == NULL)
|
|
|
|
errExit("malloc");
|
|
|
|
}
|
|
|
|
|
|
|
|
printf("\\n============== After allocating blocks ==============\\n");
|
|
|
|
display_mallinfo();
|
|
|
|
|
|
|
|
for (j = freeBegin; j < freeEnd; j += freeStep)
|
|
|
|
free(alloc[j]);
|
|
|
|
|
|
|
|
printf("\\n============== After freeing blocks ==============\\n");
|
|
|
|
display_mallinfo();
|
|
|
|
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|
|
|
|
.fi
|
|
|
|
.SH SEE ALSO
|
|
|
|
.ad l
|
|
|
|
.nh
|
|
|
|
.BR mmap (2),
|
|
|
|
.BR malloc (3),
|
2012-03-08 21:15:58 +00:00
|
|
|
.BR malloc_info (3),
|
2011-09-19 15:14:30 +00:00
|
|
|
.BR malloc_stats (3),
|
|
|
|
.BR malloc_trim (3),
|
|
|
|
.BR mallopt (3)
|