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Multipage allocation

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We can also quite simply allocate bigger blocks. Anyway, we need these
blocks to be aligned to their size which needs one mmap() two times
bigger and then two munmap()s returning the unaligned parts.

The user can specify -B <N> on startup when <N> is the exponent of 2,
setting the block size to 2^N. On most systems, N is 12, anyway if you
know that your configuration is going to eat gigabytes of RAM, you are
almost forced to raise your block size as you may easily get into memory
fragmentation issues or you have to raise your maximum mapping count,
e.g. "sysctl vm.max_map_count=(number)".
This commit is contained in:
Maria Matejka
2021-09-08 11:29:49 +02:00
parent 3a31c3aad6
commit 6cd3771378
5 changed files with 62 additions and 4 deletions
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32
sysdep/unix/main.c
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@@ -682,7 +682,7 @@ signal_init(void)
* Parsing of command-line arguments
*/
static char *opt_list = "bc:dD:ps:P:u:g:flRh";
static char *opt_list = "B:c:dD:ps:P:u:g:flRh";
int parse_and_exit;
char *bird_name;
static char *use_user;
@@ -703,6 +703,7 @@ display_help(void)
fprintf(stderr,
"\n"
"Options: \n"
" -B <block-size> Use 2^this number as memory allocation block size (default: 12)\n"
" -c <config-file> Use given configuration file instead of\n"
" " PATH_CONFIG_FILE "\n"
" -d Enable debug messages and run bird in foreground\n"
@@ -789,12 +790,15 @@ get_gid(const char *s)
return gr->gr_gid;
}
extern _Bool alloc_multipage;
static void
parse_args(int argc, char **argv)
{
int config_changed = 0;
int socket_changed = 0;
int c;
int bp;
bird_name = get_bird_name(argv[0], "bird");
if (argc == 2)
@@ -807,6 +811,29 @@ parse_args(int argc, char **argv)
while ((c = getopt(argc, argv, opt_list)) >= 0)
switch (c)
{
case 'B':
bp = atoi(optarg);
if (bp < 1)
{
fprintf(stderr, "Strange block size power %d\n\n", bp);
display_usage();
exit(1);
}
if ((1 << bp) < page_size)
{
fprintf(stderr, "Requested block size %ld is lesser than page size %ld\n\n", (1L<<bp), page_size);
display_usage();
exit(1);
}
if ((1L << bp) > page_size)
{
alloc_multipage = 1;
page_size = (1L << bp);
}
break;
case 'c':
config_name = optarg;
config_changed = 1;
@@ -861,6 +888,8 @@ parse_args(int argc, char **argv)
}
}
void resource_sys_init(void);
/*
* Hic Est main()
*/
@@ -873,6 +902,7 @@ main(int argc, char **argv)
dmalloc_debug(0x2f03d00);
#endif
resource_sys_init();
parse_args(argc, argv);
log_switch(1, NULL, NULL);