79fc0e70c0
* procmap.c: (glibtop_get_proc_map_s):
Small improvements.
Use g_array_sized_new instead of g_array_new with
reserved_size = 100.
Don't use g_array_append_val to avoid copying
glibtop_map_entries. Use g_array_set_size(size + 1) instead.
I've run a little python benchmark and this shows a little
speedup. I hope this would be more sensible in
gnome-system-monitor (glibtop_get_procmap is intensively used for
the 'Writable Memory' column).
152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/* $Id$ */
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/* 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 <glib.h>
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/procmap.h>
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#include <linux/kdev_t.h>
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#define PROC_MAPS_FORMAT ((sizeof(void*) == 8) \
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? "%16lx-%16lx %4c %16lx %02hx:%02hx %lu%*[ ]%[^\n]\n" \
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: "%08lx-%08lx %4c %08lx %02hx:%02hx %lu%*[ ]%[^\n]\n")
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static const unsigned long _glibtop_sysdeps_proc_map =
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(1L << GLIBTOP_PROC_MAP_NUMBER) + (1L << GLIBTOP_PROC_MAP_TOTAL) +
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(1L << GLIBTOP_PROC_MAP_SIZE);
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static const unsigned long _glibtop_sysdeps_map_entry =
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(1L << GLIBTOP_MAP_ENTRY_START) + (1L << GLIBTOP_MAP_ENTRY_END) +
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(1L << GLIBTOP_MAP_ENTRY_OFFSET) + (1L << GLIBTOP_MAP_ENTRY_PERM) +
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(1L << GLIBTOP_MAP_ENTRY_INODE) + (1L << GLIBTOP_MAP_ENTRY_DEVICE) +
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(1L << GLIBTOP_MAP_ENTRY_FILENAME);
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/* Init function. */
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void
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glibtop_init_proc_map_s (glibtop *server)
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{
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server->sysdeps.proc_map = _glibtop_sysdeps_proc_map;
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}
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/* Provides detailed information about a process. */
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glibtop_map_entry *
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glibtop_get_proc_map_s (glibtop *server, glibtop_proc_map *buf, pid_t pid)
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{
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char procfilename[GLIBTOP_MAP_FILENAME_LEN+1];
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/*
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default size of 100 maybe inaccurate.
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It's the average number of entry per process on my laptop
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*/
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GArray *entry_list = g_array_sized_new(FALSE, FALSE,
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sizeof(glibtop_map_entry),
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100);
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FILE *maps;
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glibtop_init_s (&server, GLIBTOP_SYSDEPS_PROC_MAP, 0);
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memset (buf, 0, sizeof (glibtop_proc_map));
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snprintf (procfilename, sizeof procfilename, "/proc/%d/maps", pid);
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if((maps = fopen (procfilename, "r")) == NULL) {
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return (glibtop_map_entry*) g_array_free(entry_list, TRUE);
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}
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while(TRUE)
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{
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unsigned long perm = 0;
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int rv;
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guint len;
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unsigned short dev_major, dev_minor;
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unsigned long start, end, offset, inode;
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char flags[4];
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char filename [GLIBTOP_MAP_FILENAME_LEN+1];
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glibtop_map_entry *entry;
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/* 8 arguments */
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rv = fscanf (maps, PROC_MAPS_FORMAT,
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&start, &end, flags, &offset,
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&dev_major, &dev_minor, &inode, filename);
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if(rv == EOF || rv < 7)
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break;
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if(rv == 7) /* no filename */
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filename[0] = '\0';
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/* Compute access permissions. */
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if (flags [0] == 'r')
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perm |= GLIBTOP_MAP_PERM_READ;
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if (flags [1] == 'w')
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perm |= GLIBTOP_MAP_PERM_WRITE;
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if (flags [2] == 'x')
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perm |= GLIBTOP_MAP_PERM_EXECUTE;
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if (flags [3] == 's')
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perm |= GLIBTOP_MAP_PERM_SHARED;
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else if (flags [3] == 'p')
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perm |= GLIBTOP_MAP_PERM_PRIVATE;
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/*
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avoid copying the entry, grow by 1 and point to the last
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element.
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*/
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len = entry_list->len;
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g_array_set_size(entry_list, len + 1);
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entry = &g_array_index(entry_list, glibtop_map_entry, len);
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entry->flags = _glibtop_sysdeps_map_entry;
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entry->start = (guint64) start;
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entry->end = (guint64) end;
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entry->offset = (guint64) offset;
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entry->perm = (guint64) perm;
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entry->device = (guint64) MKDEV(dev_major, dev_minor);
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entry->inode = (guint64) inode;
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g_strlcpy(entry->filename, filename, sizeof entry->filename);
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}
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fclose (maps);
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buf->flags = _glibtop_sysdeps_proc_map;
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buf->number = entry_list->len;
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buf->size = sizeof (glibtop_map_entry);
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buf->total = buf->number * buf->size;
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return (glibtop_map_entry*) g_array_free(entry_list, FALSE);
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}
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