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memory: Added a fallback to use mmap without hugepages in case mmap with hugepages fails; in case the fallback is used, a warning is provided to the user

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This commit is contained in:
Sonja Kolen 2018-07-18 16:58:07 +02:00
parent 5c179a6609
commit aaf20934fd
1 changed files with 21 additions and 2 deletions
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23
lib/memory/hugepage.c
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@ -72,8 +72,27 @@ static struct memory_allocation * memory_hugepage_alloc(struct memory_type *m, s
ma->address = mmap(NULL, ma->length, prot, flags, -1, 0);
if (ma->address == MAP_FAILED) {
free(ma);
return NULL;
//try again without hugepages as fallback solution, warn the user
prot= PROT_READ | PROT_WRITE;
//same flags as above without hugepages
flags = MAP_PRIVATE | MAP_ANONYMOUS;
#ifdef __linux__
if(getuid() == 0){
flags |= MAP_LOCKED;
}
#endif
//length has to be aligned with pagesize
ma->length = ALIGN(len, getpagesize());
//try mmap again
ma->address = mmap(NULL, ma->length, prot, flags, -1, 0);
if(ma->address == MAP_FAILED){
free(ma);
return NULL;
}
else{
warn("memory_hugepage_alloc: hugepage could not be mapped, mapped without hugepages instead!");
}
}
return ma;