diff options
Diffstat (limited to 'libgo/runtime/mem.c')
| -rw-r--r-- | libgo/runtime/mem.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libgo/runtime/mem.c b/libgo/runtime/mem.c index e70694c..e606bdd 100644 --- a/libgo/runtime/mem.c +++ b/libgo/runtime/mem.c @@ -18,6 +18,10 @@ #endif #endif +#ifndef MAP_NORESERVE +#define MAP_NORESERVE 0 +#endif + #ifdef USE_DEV_ZERO static int dev_zero = -1; #endif @@ -134,7 +138,11 @@ runtime_SysReserve(void *v, uintptr n) return v; } - p = runtime_mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, fd, 0); + // Use the MAP_NORESERVE mmap() flag here because typically most of + // this reservation will never be used. It does not make sense + // reserve a huge amount of unneeded swap space. This is important on + // systems which do not overcommit memory by default. + p = runtime_mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_NORESERVE, fd, 0); if(p == MAP_FAILED) return nil; return p; |