src/util/xadvise.c
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include "build-defs.h" | ||
| 2 | #if HAVE_POSIX_MADVISE | ||
| 3 | #include <sys/mman.h> | ||
| 4 | #endif | ||
| 5 | #include "xadvise.h" | ||
| 6 | #include "debug.h" | ||
| 7 | |||
| 8 | 1 | int advise_sequential(void *addr, size_t len) | |
| 9 | { | ||
| 10 | 1 | BUG_ON(len == 0); | |
| 11 | |||
| 12 | #if HAVE_POSIX_MADVISE | ||
| 13 | 1 | return posix_madvise(addr, len, POSIX_MADV_SEQUENTIAL); | |
| 14 | #else | ||
| 15 | (void)addr; | ||
| 16 | #endif | ||
| 17 | |||
| 18 | // "The posix_madvise() function shall have no effect on the semantics | ||
| 19 | // of access to memory in the specified range, although it may affect | ||
| 20 | // the performance of access". Ergo, doing nothing is a valid fallback. | ||
| 21 | return 0; | ||
| 22 | } | ||
| 23 |