Author: jhb Date: Wed May 27 18:11:05 2015 New Revision: 283624 URL: https://svnweb.freebsd.org/changeset/base/283624
Log: Export a list of VM objects in the system via a sysctl. The list can be examined via 'vmstat -o'. It can be used to determine which files are using physical pages of memory and how much each is using. Differential Revision: https://reviews.freebsd.org/D2277 Reviewed by: alc, kib MFC after: 2 weeks Sponsored by: Norse Corp, Inc. (forward porting to HEAD/10) Added: head/lib/libutil/kinfo_getvmobject.3 (contents, props changed) head/lib/libutil/kinfo_getvmobject.c (contents, props changed) Modified: head/lib/libutil/Makefile head/lib/libutil/libutil.h head/sys/sys/user.h head/sys/vm/vm_object.c head/usr.bin/vmstat/vmstat.8 head/usr.bin/vmstat/vmstat.c Modified: head/lib/libutil/Makefile ============================================================================== --- head/lib/libutil/Makefile Wed May 27 18:07:32 2015 (r283623) +++ head/lib/libutil/Makefile Wed May 27 18:11:05 2015 (r283624) @@ -10,7 +10,8 @@ SHLIB_MAJOR= 9 SRCS= _secure_path.c auth.c expand_number.c flopen.c fparseln.c gr_util.c \ hexdump.c humanize_number.c kinfo_getfile.c kinfo_getfile.c \ - kinfo_getallproc.c kinfo_getproc.c kinfo_getvmmap.c kld.c \ + kinfo_getallproc.c kinfo_getproc.c kinfo_getvmmap.c \ + kinfo_getvmobject.c kld.c \ login_auth.c login_cap.c \ login_class.c login_crypt.c login_ok.c login_times.c login_tty.c \ pidfile.c property.c pty.c pw_util.c quotafile.c realhostname.c \ @@ -27,7 +28,8 @@ CFLAGS+= -I${.CURDIR} -I${.CURDIR}/../li MAN+= expand_number.3 flopen.3 fparseln.3 hexdump.3 \ humanize_number.3 kinfo_getallproc.3 kinfo_getfile.3 \ - kinfo_getproc.3 kinfo_getvmmap.3 kld.3 login_auth.3 login_cap.3 \ + kinfo_getproc.3 kinfo_getvmmap.3 kinfo_getvmobject.3 kld.3 \ + login_auth.3 login_cap.3 \ login_class.3 login_ok.3 login_times.3 login_tty.3 pidfile.3 \ property.3 pty.3 quotafile.3 realhostname.3 realhostname_sa.3 \ _secure_path.3 trimdomain.3 uucplock.3 pw_util.3 Added: head/lib/libutil/kinfo_getvmobject.3 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libutil/kinfo_getvmobject.3 Wed May 27 18:11:05 2015 (r283624) @@ -0,0 +1,74 @@ +.\" +.\" Copyright (c) 2015 John Baldwin <j...@freebsd.org> +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd May 27, 2015 +.Dt KINFO_GETVMOBJECT 3 +.Os +.Sh NAME +.Nm kinfo_getvmobject +.Nd function for getting system-wide memory information +.Sh LIBRARY +.Lb libutil +.Sh SYNOPSIS +.In sys/types.h +.In sys/user.h +.In libutil.h +.Ft struct kinfo_vmobject * +.Fn kinfo_getvmobject "int *cntp" +.Sh DESCRIPTION +This function is used to obtain information about the objects using memory +in the system. +.Pp +The +.Ar cntp +argument allows the caller to know how many records are returned. +.Pp +This function is a wrapper around the +.Dq vm.objects +.Xr sysctl 3 +MIB. +While the kernel returns a packed structure, this function expands the +data into a fixed record format. +.Sh RETURN VALUES +On success the +.Fn kinfo_getvmobject +function returns a pointer to an array of +.Vt struct kinfo_vmobject +structures as defined by +.In sys/user.h . +The array is allocated by an internal call to +.Xr malloc 3 +and must be freed by the caller with a call to +.Xr free 3 . +On failure the +.Fn kinfo_getvmobject +function returns +.Dv NULL . +.Sh SEE ALSO +.Xr free 3 , +.Xr kinfo_getvmmap 3 , +.Xr malloc 3 Added: head/lib/libutil/kinfo_getvmobject.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libutil/kinfo_getvmobject.c Wed May 27 18:11:05 2015 (r283624) @@ -0,0 +1,94 @@ +/* + * Copyright (c) 2013 Hudson River Trading LLC + * Written by: John H. Baldwin <j...@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/sysctl.h> +#include <sys/user.h> +#include <stdlib.h> +#include <string.h> + +#include "libutil.h" + +struct kinfo_vmobject * +kinfo_getvmobject(int *cntp) +{ + char *buf, *bp, *ep; + struct kinfo_vmobject *kvo, *list, *kp; + size_t len; + int cnt, i; + + buf = NULL; + for (i = 0; i < 3; i++) { + if (sysctlbyname("vm.objects", NULL, &len, NULL, 0) < 0) + return (NULL); + buf = reallocf(buf, len); + if (buf == NULL) + return (NULL); + if (sysctlbyname("vm.objects", buf, &len, NULL, 0) == 0) + goto unpack; + if (errno != ENOMEM) { + free(buf); + return (NULL); + } + } + free(buf); + return (NULL); + +unpack: + /* Count items */ + cnt = 0; + bp = buf; + ep = buf + len; + while (bp < ep) { + kvo = (struct kinfo_vmobject *)(uintptr_t)bp; + bp += kvo->kvo_structsize; + cnt++; + } + + list = calloc(cnt, sizeof(*list)); + if (list == NULL) { + free(buf); + return (NULL); + } + + /* Unpack */ + bp = buf; + kp = list; + while (bp < ep) { + kvo = (struct kinfo_vmobject *)(uintptr_t)bp; + memcpy(kp, kvo, kvo->kvo_structsize); + bp += kvo->kvo_structsize; + kp->kvo_structsize = sizeof(*kp); + kp++; + } + free(buf); + *cntp = cnt; + return (list); +} Modified: head/lib/libutil/libutil.h ============================================================================== --- head/lib/libutil/libutil.h Wed May 27 18:07:32 2015 (r283623) +++ head/lib/libutil/libutil.h Wed May 27 18:11:05 2015 (r283624) @@ -102,6 +102,8 @@ struct kinfo_file * kinfo_getfile(pid_t _pid, int *_cntp); struct kinfo_vmentry * kinfo_getvmmap(pid_t _pid, int *_cntp); +struct kinfo_vmobject * + kinfo_getvmobject(int *_cntp); struct kinfo_proc * kinfo_getallproc(int *_cntp); struct kinfo_proc * Modified: head/sys/sys/user.h ============================================================================== --- head/sys/sys/user.h Wed May 27 18:07:32 2015 (r283623) +++ head/sys/sys/user.h Wed May 27 18:11:05 2015 (r283624) @@ -486,6 +486,27 @@ struct kinfo_vmentry { }; /* + * The "vm.objects" sysctl provides a list of all VM objects in the system + * via an array of these entries. + */ +struct kinfo_vmobject { + int kvo_structsize; /* Variable size of record. */ + int kvo_type; /* Object type: KVME_TYPE_*. */ + uint64_t kvo_size; /* Object size in pages. */ + uint64_t kvo_vn_fileid; /* inode number if vnode. */ + uint32_t kvo_vn_fsid; /* dev_t of vnode location. */ + int kvo_ref_count; /* Reference count. */ + int kvo_shadow_count; /* Shadow count. */ + int kvo_memattr; /* Memory attribute. */ + uint64_t kvo_resident; /* Number of resident pages. */ + uint64_t kvo_active; /* Number of active pages. */ + uint64_t kvo_inactive; /* Number of inactive pages. */ + uint64_t _kvo_qspare[8]; + uint32_t _kvo_ispare[8]; + char kvo_path[PATH_MAX]; /* Pathname, if any. */ +}; + +/* * The KERN_PROC_KSTACK sysctl allows a process to dump the kernel stacks of * another process as a series of entries. Each stack is represented by a * series of symbol names and offsets as generated by stack_sbuf_print(9). Modified: head/sys/vm/vm_object.c ============================================================================== --- head/sys/vm/vm_object.c Wed May 27 18:07:32 2015 (r283623) +++ head/sys/vm/vm_object.c Wed May 27 18:11:05 2015 (r283624) @@ -79,6 +79,7 @@ __FBSDID("$FreeBSD$"); #include <sys/socket.h> #include <sys/resourcevar.h> #include <sys/rwlock.h> +#include <sys/user.h> #include <sys/vnode.h> #include <sys/vmmeter.h> #include <sys/sx.h> @@ -2286,6 +2287,142 @@ next_page: } } +static int +sysctl_vm_object_list(SYSCTL_HANDLER_ARGS) +{ + struct kinfo_vmobject kvo; + char *fullpath, *freepath; + struct vnode *vp; + struct vattr va; + vm_object_t obj; + vm_page_t m; + int count, error; + + if (req->oldptr == NULL) { + /* + * If an old buffer has not been provided, generate an + * estimate of the space needed for a subsequent call. + */ + mtx_lock(&vm_object_list_mtx); + count = 0; + TAILQ_FOREACH(obj, &vm_object_list, object_list) { + if (obj->type == OBJT_DEAD) + continue; + count++; + } + mtx_unlock(&vm_object_list_mtx); + return (SYSCTL_OUT(req, NULL, sizeof(struct kinfo_vmobject) * + count * 11 / 10)); + } + + error = 0; + + /* + * VM objects are type stable and are never removed from the + * list once added. This allows us to safely read obj->object_list + * after reacquiring the VM object lock. + */ + mtx_lock(&vm_object_list_mtx); + TAILQ_FOREACH(obj, &vm_object_list, object_list) { + if (obj->type == OBJT_DEAD) + continue; + VM_OBJECT_RLOCK(obj); + if (obj->type == OBJT_DEAD) { + VM_OBJECT_RUNLOCK(obj); + continue; + } + mtx_unlock(&vm_object_list_mtx); + kvo.kvo_size = ptoa(obj->size); + kvo.kvo_resident = obj->resident_page_count; + kvo.kvo_ref_count = obj->ref_count; + kvo.kvo_shadow_count = obj->shadow_count; + kvo.kvo_memattr = obj->memattr; + kvo.kvo_active = 0; + kvo.kvo_inactive = 0; + TAILQ_FOREACH(m, &obj->memq, listq) { + /* + * A page may belong to the object but be + * dequeued and set to PQ_NONE while the + * object lock is not held. This makes the + * reads of m->queue below racy, and we do not + * count pages set to PQ_NONE. However, this + * sysctl is only meant to give an + * approximation of the system anyway. + */ + if (m->queue == PQ_ACTIVE) + kvo.kvo_active++; + else if (m->queue == PQ_INACTIVE) + kvo.kvo_inactive++; + } + + kvo.kvo_vn_fileid = 0; + kvo.kvo_vn_fsid = 0; + freepath = NULL; + fullpath = ""; + vp = NULL; + switch (obj->type) { + case OBJT_DEFAULT: + kvo.kvo_type = KVME_TYPE_DEFAULT; + break; + case OBJT_VNODE: + kvo.kvo_type = KVME_TYPE_VNODE; + vp = obj->handle; + vref(vp); + break; + case OBJT_SWAP: + kvo.kvo_type = KVME_TYPE_SWAP; + break; + case OBJT_DEVICE: + kvo.kvo_type = KVME_TYPE_DEVICE; + break; + case OBJT_PHYS: + kvo.kvo_type = KVME_TYPE_PHYS; + break; + case OBJT_DEAD: + kvo.kvo_type = KVME_TYPE_DEAD; + break; + case OBJT_SG: + kvo.kvo_type = KVME_TYPE_SG; + break; + case OBJT_MGTDEVICE: + kvo.kvo_type = KVME_TYPE_MGTDEVICE; + break; + default: + kvo.kvo_type = KVME_TYPE_UNKNOWN; + break; + } + VM_OBJECT_RUNLOCK(obj); + if (vp != NULL) { + vn_fullpath(curthread, vp, &fullpath, &freepath); + vn_lock(vp, LK_SHARED | LK_RETRY); + if (VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) { + kvo.kvo_vn_fileid = va.va_fileid; + kvo.kvo_vn_fsid = va.va_fsid; + } + vput(vp); + } + + strlcpy(kvo.kvo_path, fullpath, sizeof(kvo.kvo_path)); + if (freepath != NULL) + free(freepath, M_TEMP); + + /* Pack record size down */ + kvo.kvo_structsize = offsetof(struct kinfo_vmobject, kvo_path) + + strlen(kvo.kvo_path) + 1; + kvo.kvo_structsize = roundup(kvo.kvo_structsize, + sizeof(uint64_t)); + error = SYSCTL_OUT(req, &kvo, kvo.kvo_structsize); + mtx_lock(&vm_object_list_mtx); + if (error) + break; + } + mtx_unlock(&vm_object_list_mtx); + return (error); +} +SYSCTL_PROC(_vm, OID_AUTO, objects, CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_SKIP | + CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_object_list, "S,kinfo_vmobject", + "List of VM objects"); + #include "opt_ddb.h" #ifdef DDB #include <sys/kernel.h> Modified: head/usr.bin/vmstat/vmstat.8 ============================================================================== --- head/usr.bin/vmstat/vmstat.8 Wed May 27 18:07:32 2015 (r283623) +++ head/usr.bin/vmstat/vmstat.8 Wed May 27 18:11:05 2015 (r283624) @@ -37,7 +37,7 @@ .Sh SYNOPSIS .Nm .\" .Op Fl fimst -.Op Fl afHhimPsz +.Op Fl afHhimoPsz .Op Fl M Ar core Op Fl N Ar system .Op Fl c Ar count .Op Fl n Ar devs @@ -119,6 +119,9 @@ Report on the usage of kernel dynamic me by type. .It Fl n Change the maximum number of disks to display from the default of 2. +.It Fl o +Display a list of virtual memory objects in the system and the resident +memory used by each object. .It Fl P Report per-cpu system/user/idle cpu statistics. .It Fl p Modified: head/usr.bin/vmstat/vmstat.c ============================================================================== --- head/usr.bin/vmstat/vmstat.c Wed May 27 18:07:32 2015 (r283623) +++ head/usr.bin/vmstat/vmstat.c Wed May 27 18:11:05 2015 (r283624) @@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$"); #include <sys/resource.h> #include <sys/sysctl.h> #include <sys/time.h> +#include <sys/user.h> #include <sys/vmmeter.h> #include <sys/pcpu.h> @@ -143,12 +144,14 @@ static kvm_t *kd; #define TIMESTAT 0x10 #define VMSTAT 0x20 #define ZMEMSTAT 0x40 +#define OBJSTAT 0x80 static void cpustats(void); static void pcpustats(int, u_long, int); static void devstats(void); static void doforkst(void); static void dointr(unsigned int, int); +static void doobjstat(void); static void dosum(void); static void dovmstat(unsigned int, int); static void domemstat_malloc(void); @@ -181,7 +184,7 @@ main(int argc, char *argv[]) interval = reps = todo = 0; maxshowdevs = 2; hflag = isatty(1); - while ((c = getopt(argc, argv, "ac:fhHiM:mN:n:Pp:stw:z")) != -1) { + while ((c = getopt(argc, argv, "ac:fhHiM:mN:n:oPp:stw:z")) != -1) { switch (c) { case 'a': aflag++; @@ -220,6 +223,9 @@ main(int argc, char *argv[]) errx(1, "number of devices %d is < 0", maxshowdevs); break; + case 'o': + todo |= OBJSTAT; + break; case 'p': if (devstat_buildmatch(optarg, &matches, &num_matches) != 0) errx(1, "%s", devstat_errbuf); @@ -320,6 +326,8 @@ retry_nlist: domemstat_zone(); if (todo & SUMSTAT) dosum(); + if (todo & OBJSTAT) + doobjstat(); #ifdef notyet if (todo & TIMESTAT) dotimes(); @@ -1396,6 +1404,129 @@ domemstat_zone(void) printf("\n"); } +static void +display_object(struct kinfo_vmobject *kvo) +{ + const char *str; + + printf("%5jd ", (uintmax_t)kvo->kvo_resident); + printf("%5jd ", (uintmax_t)kvo->kvo_active); + printf("%5jd ", (uintmax_t)kvo->kvo_inactive); + printf("%3d ", kvo->kvo_ref_count); + printf("%3d ", kvo->kvo_shadow_count); + switch (kvo->kvo_memattr) { +#ifdef VM_MEMATTR_UNCACHEABLE + case VM_MEMATTR_UNCACHEABLE: + str = "UC"; + break; +#endif +#ifdef VM_MEMATTR_WRITE_COMBINING + case VM_MEMATTR_WRITE_COMBINING: + str = "WC"; + break; +#endif +#ifdef VM_MEMATTR_WRITE_THROUGH + case VM_MEMATTR_WRITE_THROUGH: + str = "WT"; + break; +#endif +#ifdef VM_MEMATTR_WRITE_PROTECTED + case VM_MEMATTR_WRITE_PROTECTED: + str = "WP"; + break; +#endif +#ifdef VM_MEMATTR_WRITE_BACK + case VM_MEMATTR_WRITE_BACK: + str = "WB"; + break; +#endif +#ifdef VM_MEMATTR_WEAK_UNCACHEABLE + case VM_MEMATTR_WEAK_UNCACHEABLE: + str = "UC-"; + break; +#endif +#ifdef VM_MEMATTR_WB_WA: + case VM_MEMATTR_WB_WA: + str = "WB"; + break; +#endif +#ifdef VM_MEMATTR_NOCACHE + case VM_MEMATTR_NOCACHE: + str = "NC"; + break; +#endif +#ifdef VM_MEMATTR_DEVICE + case VM_MEMATTR_DEVICE: + str = "DEV"; + break; +#endif +#ifdef VM_MEMATTR_CACHEABLE + case VM_MEMATTR_CACHEABLE: + str = "C"; + break; +#endif +#ifdef VM_MEMATTR_PREFETCHABLE + case VM_MEMATTR_PREFETCHABLE: + str = "PRE"; + break; +#endif + default: + str = "??"; + break; + } + printf("%-3s ", str); + switch (kvo->kvo_type) { + case KVME_TYPE_NONE: + str = "--"; + break; + case KVME_TYPE_DEFAULT: + str = "df"; + break; + case KVME_TYPE_VNODE: + str = "vn"; + break; + case KVME_TYPE_SWAP: + str = "sw"; + break; + case KVME_TYPE_DEVICE: + str = "dv"; + break; + case KVME_TYPE_PHYS: + str = "ph"; + break; + case KVME_TYPE_DEAD: + str = "dd"; + break; + case KVME_TYPE_SG: + str = "sg"; + break; + case KVME_TYPE_UNKNOWN: + default: + str = "??"; + break; + } + printf("%-2s ", str); + printf("%-s\n", kvo->kvo_path); +} + +static void +doobjstat(void) +{ + struct kinfo_vmobject *kvo; + int cnt, i; + + kvo = kinfo_getvmobject(&cnt); + if (kvo == NULL) { + warn("Failed to fetch VM object list"); + return; + } + printf("%5s %5s %5s %3s %3s %3s %2s %s\n", "RES", "ACT", "INACT", + "REF", "SHD", "CM", "TP", "PATH"); + for (i = 0; i < cnt; i++) + display_object(&kvo[i]); + free(kvo); +} + /* * kread reads something from the kernel, given its nlist index. */ @@ -1448,7 +1579,7 @@ static void usage(void) { (void)fprintf(stderr, "%s%s", - "usage: vmstat [-afHhimPsz] [-M core [-N system]] [-c count] [-n devs]\n", + "usage: vmstat [-afHhimoPsz] [-M core [-N system]] [-c count] [-n devs]\n", " [-p type,if,pass] [-w wait] [disks] [wait [count]]\n"); exit(1); } _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
