You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
792 B
38 lines
792 B
/* readahead.c - preload files into disk cache.
|
|
*
|
|
* Copyright 2013 Rob Landley <rob@landley.net>
|
|
*
|
|
* No standard.
|
|
|
|
USE_READAHEAD(NEWTOY(readahead, NULL, TOYFLAG_BIN))
|
|
|
|
config READAHEAD
|
|
bool "readahead"
|
|
default y
|
|
help
|
|
usage: readahead FILE...
|
|
|
|
Preload files into disk cache.
|
|
*/
|
|
|
|
#include "toys.h"
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
static void do_readahead(int fd, char *name)
|
|
{
|
|
int rc;
|
|
|
|
// Since including fcntl.h doesn't give us the wrapper, use the syscall.
|
|
// 32 bits takes LO/HI offset (we don't care about endianness of 0).
|
|
if (sizeof(long) == 4) rc = syscall(__NR_readahead, fd, 0, 0, INT_MAX);
|
|
else rc = syscall(__NR_readahead, fd, 0, INT_MAX);
|
|
|
|
if (rc) perror_msg("readahead: %s", name);
|
|
}
|
|
|
|
void readahead_main(void)
|
|
{
|
|
loopfiles(toys.optargs, do_readahead);
|
|
}
|