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memutils.c
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memutils.c
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/* memutils.c - Provides memory related information
* other than those provided by kmem command.
* Currently the following are supported.
*
* 1) The page count per migrate type for all orders,
* for all nodes.
*
* Copyright (C) 2013, Vinayak Menon <[email protected]>
* Author: Vinayak Menon <[email protected]>
*
* This program 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.
*
* This program 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.
*/
#include "defs.h"
void memutils_init(void);
void memutils_fini(void);
void cmd_memutils(void);
char *help_memutils[];
static struct command_table_entry command_table[] = {
{ "memutils", cmd_memutils, help_memutils, 0},
{ NULL },
};
static void dump_pgtype_info(void);
void __attribute__((constructor))
memutils_init(void)
{
register_extension(command_table);
}
void __attribute__((destructor))
memutils_fini(void) { }
void
cmd_memutils(void)
{
int c;
int pflag = 0;
while ((c = getopt(argcnt, args, "p")) != EOF) {
switch (c) {
case 'p':
pflag = 1;
break;
default:
argerrs++;
break;
}
}
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
if (pflag == 1)
dump_pgtype_info();
}
static void dump_pgtype_info(void)
{
int n, m, z, o;
int list_count = 0;
ulong free_cnt = 0;
int mtype_sym = 0;
int mtype_len = 0;
ulong *mtypes;
ulong node_zones;
ulong temp;
ulong freelist;
ulong *free_ptr;
char *free_list_buf;
char name_buf[BUFSIZE];
char buf[BUFSIZE];
struct node_table *nt;
struct list_data list_data;
if (!(vt->flags & (NODES|ZONES)))
error(FATAL,
"dump_pgtype_info called without (NODES|ZONES)\n");
if (!VALID_STRUCT(zone))
error(FATAL,
"zone struct not available in this kernel\n");
if (VALID_STRUCT(free_area)) {
if (SIZE(free_area) == (3 * sizeof(ulong)))
error(FATAL,
"free_area type not supported by command\n");
else
list_count = MEMBER_SIZE("free_area",
"free_list")/SIZE(list_head);
} else
error(FATAL,
"free_area structure not found in this kernel\n");
free_list_buf = GETBUF(SIZE(list_head));
do {
if (symbol_exists("migratetype_names") &&
(get_symbol_type("migratetype_names",
NULL, NULL) == TYPE_CODE_ARRAY)) {
open_tmpfile();
sprintf(buf, "whatis migratetype_names");
if (!gdb_pass_through(buf, fp, GNU_RETURN_ON_ERROR)) {
close_tmpfile();
break;
}
rewind(pc->tmpfile);
while (fgets(buf, BUFSIZE, pc->tmpfile)) {
if (STRNEQ(buf, "type = "))
break;
}
close_tmpfile();
if (!strstr(buf, "char *") ||
(count_chars(buf, '[') != 1) ||
(count_chars(buf, ']') != 1))
break;
mtype_len = get_array_length("migratetype_names",
NULL, 0);
mtypes = (ulong *)GETBUF(mtype_len * sizeof(ulong));
readmem(symbol_value("migratetype_names"),
KVADDR, mtypes,
(mtype_len * sizeof(ulong)),
NULL, FAULT_ON_ERROR);
mtype_sym = 1;
}
} while (0);
fprintf(fp, "%-43s [%d-%d]:",
"Free pages count per migrate type at order",
0, vt->nr_free_areas - 1);
fprintf(fp, "\n");
for (n = 0; n < vt->numnodes; n++) {
nt = &vt->node_table[n];
node_zones = nt->pgdat + OFFSET(pglist_data_node_zones);
for (m = 0; m < list_count; m++) {
for (z = 0; z < vt->nr_zones; z++) {
readmem((node_zones + (z * SIZE(zone)))
+ OFFSET(zone_name), KVADDR, &temp,
sizeof(void *), "node_zones name",
FAULT_ON_ERROR);
read_string(temp, name_buf, BUFSIZE-1);
fprintf(fp, "Node %4d, ", nt->node_id);
fprintf(fp, "zone %8s, ", name_buf);
if (mtype_sym) {
read_string(mtypes[m],
name_buf, BUFSIZE-1);
fprintf(fp, "type %12s ", name_buf);
} else
fprintf(fp, "type %12d ", m);
for (o = 0; o < vt->nr_free_areas; o++) {
freelist =
(node_zones + (z * SIZE(zone)))
+ (OFFSET(zone_free_area) +
(o * SIZE(free_area))) +
(m * SIZE(list_head));
readmem(freelist, KVADDR, free_list_buf,
SIZE(list_head),
"free_area free_list",
FAULT_ON_ERROR);
free_ptr = (ulong *)free_list_buf;
if (!(*free_ptr) ||
(*free_ptr == freelist)) {
fprintf(fp, "%6lu ", (ulong)0);
continue;
}
BZERO(&list_data,
sizeof(struct list_data));
list_data.flags = RETURN_ON_DUPLICATE;
list_data.start = *free_ptr;
list_data.end = freelist;
list_data.list_head_offset =
OFFSET(page_lru) +
OFFSET(list_head_next);
free_cnt = do_list(&list_data);
if (free_cnt < 0) {
error(pc->curcmd_flags &
IGNORE_ERRORS ? INFO : FATAL,
"corrupted free list\n");
free_cnt = 0;
}
fprintf(fp, "%6lu ", free_cnt);
}
fprintf(fp, "\n");
}
}
}
FREEBUF(free_list_buf);
if (mtype_sym)
FREEBUF(mtypes);
}
char *help_memutils[] = {
"memutils",
"memory information",
"[-p]",
"The command displays memory information",
" -p displays the number of pages per migrate type for all orders, for all",
" nodes.",
"\nEXAMPLES",
"\n Display pages per migrate type for all orders, for all nodes:\n",
" %s> memutils -p",
" Free pages count per migrate type at order [0-10]:",
" Node 0, zone Normal, type Unmovable 155 172 92 39 20 8 10 15 7 3 1",
" Node 0, zone HighMem, type Unmovable 1 2 0 0 0 0 0 0 0 0 0",
" Node 0, zone Movable, type Unmovable 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Normal, type Reclaimable 9 3 0 0 1 1 0 0 0 0 0",
" Node 0, zone HighMem, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Movable, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Normal, type Movable 7 68 35 253 137 38 16 4 0 0 66",
" Node 0, zone HighMem, type Movable 0 1 0 0 0 0 0 0 0 0 0",
" Node 0, zone Movable, type Movable 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 1",
" Node 0, zone HighMem, type Reserve 11 7 5 1 0 0 0 0 0 0 0",
" Node 0, zone Movable, type Reserve 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone HighMem, type Isolate 0 0 0 0 0 0 0 0 0 0 0",
" Node 0, zone Movable, type Isolate 0 0 0 0 0 0 0 0 0 0 0",
NULL
};