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/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
LibGTop is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
LibGTop is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/procmem.h>
#include "glibtop_private.h"
static const unsigned long _glibtop_sysdeps_proc_mem =
(1L << GLIBTOP_PROC_MEM_SIZE) + (1L << GLIBTOP_PROC_MEM_RESIDENT) +
(1L << GLIBTOP_PROC_MEM_SHARE);
static const unsigned long _glibtop_sysdeps_proc_mem_pss =
(1L << GLIBTOP_PROC_MEM_RSS);
static unsigned long
get_pss(glibtop* server, pid_t pid)
{
char filepath[128];
FILE* smaps;
char* line = NULL;
size_t line_size = 0;
unsigned long pss = 0;
snprintf(filepath, sizeof filepath, "/proc/%u/smaps", (unsigned)pid);
if (!(smaps = fopen(filepath, "r"))) {
glibtop_error_io_r(server, "Cannot open %s", filepath);
goto out;
}
while (getline(&line, &line_size, smaps) != -1) {
if (strncmp(line, "Pss:", 4))
continue;
pss += get_scaled(line + 4, NULL);
}
out:
if (smaps)
fclose(smaps);
free(line);
return pss;
}
/* Init function. */
void
_glibtop_init_proc_mem_s (glibtop *server)
{
server->sysdeps.proc_mem = _glibtop_sysdeps_proc_mem;
if (server->os_version_code >= LINUX_VERSION_CODE(2, 6, 25))
server->sysdeps.proc_mem |= _glibtop_sysdeps_proc_mem_pss;
}
/* Provides detailed information about a process. */
void
glibtop_get_proc_mem_s (glibtop *server, glibtop_proc_mem *buf, pid_t pid)
{
char buffer [BUFSIZ], *p;
const size_t pagesize = getpagesize();
memset (buf, 0, sizeof (glibtop_proc_mem));
/* As of 2.6.24 in fs/proc/*.c
== rss vs. resident ==
stat/rss:
get_mm_rss where
#define get_mm_rss(mm) \
(get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
statm/resident:
*shared = get_mm_counter(mm, file_rss);
*resident = *shared + get_mm_counter(mm, anon_rss);
== vsize vs. size ==
stat/vsize:
task_vsize(mm) ... total_vm * pagesize
statm/size
mm->total_vm
=================
rss == resident
vsize == size
rss_lim is not implemented in statm, but there's limits which
provides all limits
share is only implemented in statm
*/
if (proc_statm_to_buffer(buffer, sizeof buffer, pid))
return;
buf->size = strtoull (buffer, &p, 0);
buf->resident = strtoull (p, &p, 0);
buf->share = strtoull (p, &p, 0);
buf->size *= pagesize;
buf->resident *= pagesize;
buf->share *= pagesize;
/* dummy values */
buf->vsize = buf->size;
buf->rss_rlim = ~0;
buf->flags |= _glibtop_sysdeps_proc_mem;
#if 0
/* FIXME: see previous comment */
if (server->os_version_code >= LINUX_VERSION_CODE(2, 6, 25)) {
buf->rss = get_pss(server, pid);
buf->flags |= _glibtop_sysdeps_proc_mem_pss;
}
#else
buf->rss = buf->resident;
#endif
}
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