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Small improvements. Use g_array_sized_new instead of g_array_new with

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* 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).
This commit is contained in:
Benoît Dejean
2005-12-07 09:35:50 +00:00
parent 532f5ceb4f
commit 79fc0e70c0
2 changed files with 41 additions and 12 deletions
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38
sysdeps/linux/procmap.c
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@@ -59,8 +59,15 @@ glibtop_map_entry *
glibtop_get_proc_map_s (glibtop *server, glibtop_proc_map *buf, pid_t pid)
{
char procfilename[GLIBTOP_MAP_FILENAME_LEN+1];
GArray *entry_list = g_array_new(FALSE, FALSE,
sizeof(glibtop_map_entry));
/*
default size of 100 maybe inaccurate.
It's the average number of entry per process on my laptop
*/
GArray *entry_list = g_array_sized_new(FALSE, FALSE,
sizeof(glibtop_map_entry),
100);
FILE *maps;
glibtop_init_s (&server, GLIBTOP_SYSDEPS_PROC_MAP, 0);
@@ -77,13 +84,14 @@ glibtop_get_proc_map_s (glibtop *server, glibtop_proc_map *buf, pid_t pid)
{
unsigned long perm = 0;
int rv;
guint len;
unsigned short dev_major, dev_minor;
unsigned long start, end, offset, inode;
char flags[4];
char filename [GLIBTOP_MAP_FILENAME_LEN+1];
glibtop_map_entry entry;
glibtop_map_entry *entry;
/* 8 arguments */
@@ -113,16 +121,22 @@ glibtop_get_proc_map_s (glibtop *server, glibtop_proc_map *buf, pid_t pid)
else if (flags [3] == 'p')
perm |= GLIBTOP_MAP_PERM_PRIVATE;
entry.flags = _glibtop_sysdeps_map_entry;
entry.start = (guint64) start;
entry.end = (guint64) end;
entry.offset = (guint64) offset;
entry.perm = (guint64) perm;
entry.device = (guint64) MKDEV(dev_major, dev_minor);
entry.inode = (guint64) inode;
g_strlcpy (entry.filename, filename, sizeof entry.filename);
/*
avoid copying the entry, grow by 1 and point to the last
element.
*/
len = entry_list->len;
g_array_set_size(entry_list, len + 1);
entry = &g_array_index(entry_list, glibtop_map_entry, len);
g_array_append_val(entry_list, entry);
entry->flags = _glibtop_sysdeps_map_entry;
entry->start = (guint64) start;
entry->end = (guint64) end;
entry->offset = (guint64) offset;
entry->perm = (guint64) perm;
entry->device = (guint64) MKDEV(dev_major, dev_minor);
entry->inode = (guint64) inode;
g_strlcpy(entry->filename, filename, sizeof entry->filename);
}
fclose (maps);