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--- storage/myisam/mi_dynrec.cc.orig 2019-09-20 08:30:51 UTC
+++ storage/myisam/mi_dynrec.cc
@@ -85,17 +85,12 @@ bool mi_dynmap_file(MI_INFO *info, my_off_t size) {
return true;
}
/*
- I wonder if it is good to use MAP_NORESERVE. From the Linux man page:
- MAP_NORESERVE
- Do not reserve swap space for this mapping. When swap space is
- reserved, one has the guarantee that it is possible to modify the
- mapping. When swap space is not reserved one might get SIGSEGV
- upon a write if no physical memory is available.
+ MAP_NORESERVE is unimplemented in FreeBSD
*/
info->s->file_map = (uchar *)my_mmap(
nullptr, (size_t)size,
info->s->mode == O_RDONLY ? PROT_READ : PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_NORESERVE, info->dfile, 0L);
+ MAP_SHARED, info->dfile, 0L);
if (info->s->file_map == (uchar *)MAP_FAILED) {
info->s->file_map = nullptr;
return true;