efaaf6eb77
From: Jason Xing <xinggang861@gmail.com> In 'Bug 323354 - Support a dynamic number of CPUs', there will be a solution which can dynamically allocate memory for large number of CPUs. As libgtop supports multiple operating systems, this work may take some time. This patch is a temporary patch, which worked before the whole solution comes out. It only supports linux platform with CPU number up to 1024. There are two Macroes which limit the statistics of CPU. One is GLIBTOP_NCPU. The other is a buffer size. This buffer used to read /proc/stat contents into. https://bugzilla.gnome.org/show_bug.cgi?id=323354 https://bugzilla.gnome.org/show_bug.cgi?id=681632
152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/* Copyright (C) 1998-99 Martin Baulig
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This file is part of LibGTop 1.0.
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Contributed by Martin Baulig <martin@home-of-linux.org>, April 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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <glibtop/error.h>
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#include <glibtop/cpu.h>
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#include "glibtop_private.h"
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static const unsigned long _glibtop_sysdeps_cpu =
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(1L << GLIBTOP_CPU_TOTAL) + (1L << GLIBTOP_CPU_USER) +
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(1L << GLIBTOP_CPU_NICE) + (1L << GLIBTOP_CPU_SYS) +
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(1L << GLIBTOP_CPU_IDLE) + (1L << GLIBTOP_CPU_FREQUENCY);
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static const unsigned long _glibtop_sysdeps_cpu_smp =
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(1L << GLIBTOP_XCPU_TOTAL) + (1L << GLIBTOP_XCPU_USER) +
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(1L << GLIBTOP_XCPU_NICE) + (1L << GLIBTOP_XCPU_SYS) +
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(1L << GLIBTOP_XCPU_IDLE);
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static const unsigned long _glibtop_sysdeps_cpu_2_6 =
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(1L << GLIBTOP_CPU_IOWAIT) + (1L << GLIBTOP_CPU_IRQ) +
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(1L << GLIBTOP_CPU_SOFTIRQ);
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static const unsigned long _glibtop_sysdeps_cpu_smp_2_6 =
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(1L << GLIBTOP_XCPU_IOWAIT) + (1L << GLIBTOP_XCPU_IRQ) +
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(1L << GLIBTOP_XCPU_SOFTIRQ);
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/* Init function. */
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void
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_glibtop_init_cpu_s (glibtop *server)
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{
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server->sysdeps.cpu = _glibtop_sysdeps_cpu;
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if (server->ncpu)
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server->sysdeps.cpu |= _glibtop_sysdeps_cpu_smp;
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if(server->os_version_code >= LINUX_VERSION_CODE(2, 6, 0))
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{
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server->sysdeps.cpu |= _glibtop_sysdeps_cpu_2_6;
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if (server->ncpu)
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server->sysdeps.cpu |= _glibtop_sysdeps_cpu_smp_2_6;
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}
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}
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/* Provides information about cpu usage. */
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#define FILENAME "/proc/stat"
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#define STAT_BUFSIZ 81920
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void
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glibtop_get_cpu_s (glibtop *server, glibtop_cpu *buf)
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{
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char buffer [STAT_BUFSIZ], *p;
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int i;
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memset (buf, 0, sizeof (glibtop_cpu));
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file_to_buffer(server, buffer, sizeof buffer, FILENAME);
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/*
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* GLOBAL
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*/
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p = skip_token (buffer); /* "cpu" */
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buf->user = strtoull (p, &p, 0);
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buf->nice = strtoull (p, &p, 0);
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buf->sys = strtoull (p, &p, 0);
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buf->idle = strtoull (p, &p, 0);
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buf->total = buf->user + buf->nice + buf->sys + buf->idle;
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/* 2.6 kernel */
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if(server->os_version_code >= LINUX_VERSION_CODE(2, 6, 0))
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{
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buf->iowait = strtoull(p, &p, 0);
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buf->irq = strtoull(p, &p, 0);
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buf->softirq = strtoull(p, &p, 0);
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buf->total += buf->iowait + buf->irq + buf->softirq;
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}
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buf->frequency = 100;
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buf->flags = _glibtop_sysdeps_cpu;
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/*
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* PER CPU
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*/
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for (i = 0; i <= server->ncpu; i++) {
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p = skip_line(p); /* move to ^ */
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if (!check_cpu_line_warn(server, p, i))
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break;
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p = skip_token(p); /* "cpuN" */
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buf->xcpu_user [i] = strtoull (p, &p, 0);
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buf->xcpu_nice [i] = strtoull (p, &p, 0);
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buf->xcpu_sys [i] = strtoull (p, &p, 0);
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buf->xcpu_idle [i] = strtoull (p, &p, 0);
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buf->xcpu_total[i] = buf->xcpu_user [i] \
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+ buf->xcpu_nice [i] \
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+ buf->xcpu_sys [i] \
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+ buf->xcpu_idle [i];
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/* 2.6 kernel */
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if(server->os_version_code >= LINUX_VERSION_CODE(2, 6, 0))
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{
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buf->xcpu_iowait [i] = strtoull(p, &p, 0);
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buf->xcpu_irq [i] = strtoull(p, &p, 0);
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buf->xcpu_softirq [i] = strtoull(p, &p, 0);
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buf->xcpu_total [i] += buf->xcpu_iowait [i] \
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+ buf->xcpu_irq [i] \
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+ buf->xcpu_softirq [i];
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}
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}
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if(server->ncpu) /* ok, that's a real SMP */
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buf->flags |= _glibtop_sysdeps_cpu_smp;
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if(server->os_version_code >= LINUX_VERSION_CODE(2, 6, 0))
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{
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buf->flags |= _glibtop_sysdeps_cpu_2_6;
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if(server->ncpu) /* ok, that's a real SMP */
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buf->flags |= _glibtop_sysdeps_cpu_smp_2_6;
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}
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}
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