bb118fa9d6
FreeBSD 11.1 removes cache memory and adds laundry memory. The MIB of cache memory still exists, but its value is always set to zero. According to the man page of top(1), the value of laundry memory means number of dirty pages queued for laundering, suggesting that it should be added to the 'user' in libgtop because it cannot be freed immediately without writing out data. Laundry memory was part of inactive memory in older FreeBSD releases. FreeBSD systems running on ZFS usually have a large portion of memory used as ZFS ARC, which has similar purpose to buffer cache of other filesystems. ZFS ARC can usually be freed quickly when the system needs more memory, so we don't want to put it in 'user' in libgtop. However, both buffer cache and ZFS ARC are parts of wired memory, and wired memory is counted in 'user'. Therefore, we subtract the size of ZFS ARC from wired memory when calculating 'user' value, making it more useful to FreeBSD users. This patch is based on the patch submiited three years ago by Benoît Dejean <bdejean@gmail.com>. https://bugzilla.gnome.org/show_bug.cgi?id=748928 https://gitlab.gnome.org/GNOME/libgtop/issues/31
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* Copyright (C) 1998 Joshua Sled
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This file is part of LibGTop 1.0.
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Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.
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LibGTop is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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LibGTop is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with LibGTop; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/mem.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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static const unsigned long _glibtop_sysdeps_mem =
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(1L << GLIBTOP_MEM_TOTAL) + (1L << GLIBTOP_MEM_USED) +
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(1L << GLIBTOP_MEM_FREE) + (1L << GLIBTOP_MEM_SHARED) +
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(1L << GLIBTOP_MEM_BUFFER) + (1L << GLIBTOP_MEM_CACHED) +
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(1L << GLIBTOP_MEM_USER);
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/* these are for getting the memory statistics */
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static int pagesize;
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/* Init function. */
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void
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_glibtop_init_mem_s (glibtop *server)
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{
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pagesize = getpagesize ();
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server->sysdeps.mem = _glibtop_sysdeps_mem;
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}
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static gulong mem_get_by_bytes (glibtop *server, const char *name) {
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gulong result = 0;
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size_t len = sizeof (result);
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if (sysctlbyname (name, &result, &len, NULL, 0)) {
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glibtop_warn_io_r (server, "sysctl (%s)", name);
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}
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return result;
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}
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static gulong try_mem_get_by_bytes (glibtop *server, const char *name) {
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gulong result = 0;
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size_t len = sizeof (result);
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if (sysctlbyname (name, &result, &len, NULL, 0)) {
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return 0;
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}
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return result;
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}
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static gulong mem_get_by_pages (glibtop *server, const char *name) {
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guint result = 0;
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size_t len = sizeof (result);
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if (sysctlbyname (name, &result, &len, NULL, 0)) {
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glibtop_warn_io_r (server, "sysctl (%s)", name);
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}
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return (gulong) result * pagesize;
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}
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void
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glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
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{
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gulong memtotal;
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gulong memactive;
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gulong meminactive;
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gulong memlaundry;
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gulong memwired;
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gulong memcached;
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gulong membuffer;
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gulong memfree;
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gulong zfs_arc_size;
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memset (buf, 0, sizeof *buf);
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memtotal = mem_get_by_bytes (server, "hw.physmem");
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memactive = mem_get_by_pages (server, "vm.stats.vm.v_active_count");
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meminactive = mem_get_by_pages (server, "vm.stats.vm.v_inactive_count");
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memlaundry = mem_get_by_pages (server, "vm.stats.vm.v_laundry_count");
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memwired = mem_get_by_pages (server, "vm.stats.vm.v_wire_count");
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memcached = mem_get_by_pages (server, "vm.stats.vm.v_cache_count");
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membuffer = mem_get_by_bytes (server, "vfs.bufspace");
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memfree = mem_get_by_pages (server, "vm.stats.vm.v_free_count");
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zfs_arc_size = try_mem_get_by_bytes (server, "kstat.zfs.misc.arcstats.size");
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buf->total = memtotal;
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buf->used = memtotal - memfree;
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buf->free = memfree;
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buf->shared = 0;
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buf->buffer = membuffer;
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buf->cached = memcached + zfs_arc_size;
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buf->locked = 0;
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buf->user = memactive + memlaundry + memwired - zfs_arc_size;
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buf->flags = _glibtop_sysdeps_mem;
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}
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