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1998-06-07  Martin Baulig  <martin@home-of-linux.org>

	* sysdeps/linux/glibtop_machine.h: New file.

	* sysdeps/linux/*.c: Performance optimizations. We now use
	`open' and `read' instead of `fopen' and `fscanf'.
This commit is contained in:
Martin Baulig
1998-06-07 20:38:02 +00:00
committed by Martin Baulig
parent c84923132a
commit 9c9ad03d60
13 changed files with 456 additions and 199 deletions
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35
sysdeps/linux/mem.c
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@@ -20,6 +20,7 @@
Boston, MA 02111-1307, USA. */
#include <config.h>
#include <glibtop/error.h>
#include <glibtop/mem.h>
static const unsigned long _glibtop_sysdeps_mem =
@@ -28,12 +29,15 @@ static const unsigned long _glibtop_sysdeps_mem =
(1 << GLIBTOP_MEM_BUFFER) + (1 << GLIBTOP_MEM_CACHED) +
(1 << GLIBTOP_MEM_USER);
#define FILENAME "/proc/meminfo"
/* Provides information about memory usage. */
void
glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
{
FILE *f;
char buffer [BUFSIZ];
int fd = 0, ret;
glibtop_init_r (&server, 0, 0);
@@ -41,13 +45,32 @@ glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
buf->flags = _glibtop_sysdeps_mem;
f = fopen ("/proc/meminfo", "r");
if (!f) return;
#ifdef GLIBTOP_CACHE_OPEN
fd = server->machine.fd_meminfo;
#endif
if (fd == 0) {
fd = open (FILENAME, O_RDONLY);
if (fd == -1)
glibtop_error_r (server, "open (%s): %s",
FILENAME, strerror (errno));
} else {
lseek (fd, 0, SEEK_SET);
}
fscanf (f, "%*[^\n]\nMem: %lu %lu %lu %lu %lu %lu\n",
&buf->total, &buf->used, &buf->free, &buf->shared, &buf->buffer, &buf->cached);
ret = read (fd, buffer, BUFSIZ);
if (ret == -1)
glibtop_error_r (server, "read (%s): %s",
FILENAME, strerror (errno));
sscanf (buffer, "%*[^\n]\nMem: %lu %lu %lu %lu %lu %lu\n",
&buf->total, &buf->used, &buf->free, &buf->shared,
&buf->buffer, &buf->cached);
buf->user = buf->total - buf->free - buf->shared - buf->buffer;
fclose (f);
#ifdef GLIBTOP_CACHE_OPEN
server->machine.fd_meminfo = fd;
#else
close (fd);
#endif
}