From 53832006245010487d8d12599ce011d67bf19f94 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Sun, 24 Feb 2013 12:51:40 -0600 Subject: Add readahead. --- toys/other/readahead.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 toys/other/readahead.c diff --git a/toys/other/readahead.c b/toys/other/readahead.c new file mode 100644 index 00000000..4edd6516 --- /dev/null +++ b/toys/other/readahead.c @@ -0,0 +1,37 @@ +/* readahead.c - preload files into disk cache. + * + * Copyright 2013 Rob Landley + * + * 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 + +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); +} -- cgit v1.2.3