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shmget: Use transparent huge pages when page size isn't specified

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Refs: #1241
Change-Id: Ia111bfeb67d224ad1ab77e5193eac7b7d14a6577
This commit is contained in:
Masamichi Takagi
2018-12-08 19:48:25 +09:00
parent 13e29c0da5
commit eb184419ea
1 changed files with 17 additions and 1 deletions
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18
kernel/syscall.c
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@@ -5196,9 +5196,25 @@ int do_shmget(const key_t key, const size_t size, const int shmflg)
return -ENOSPC; return -ENOSPC;
} }
pgshift = PAGE_SHIFT;
if (shmflg & SHM_HUGETLB) { if (shmflg & SHM_HUGETLB) {
pgshift = (shmflg >> SHM_HUGE_SHIFT) & 0x3F; pgshift = (shmflg >> SHM_HUGE_SHIFT) & 0x3F;
} else {
size_t pgsize;
int p2align;
if (size > PAGE_SIZE) {
error = arch_get_smaller_page_size(NULL, size + 1,
&pgsize, &p2align);
if (error) {
ekprintf("%s: WARNING: arch_get_smaller_page_size failed. size: %ld, error: %d\n",
__func__, size, error);
pgshift = PAGE_SHIFT;
} else {
pgshift = p2align + PAGE_SHIFT;
}
} else {
pgshift = PAGE_SHIFT;
}
} }
memset(&ads, 0, sizeof(ads)); memset(&ads, 0, sizeof(ads));