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| author | Konstantin Belousov <kib@FreeBSD.org> | 2025-09-15 00:52:47 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2025-09-15 14:11:57 +0000 |
| commit | f1b656f14464c2e3ec4ab2eeade3b00dce4bd459 (patch) | |
| tree | 24ec7d529f06752b3805b5528f825f7e9929d8b7 | |
| parent | 081f0e38e3324dd3ca63a2d5036a15f52e6cf858 (diff) | |
vm_fault_busy_sleep(): update comment after addition of allocflags arg
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D52538
| -rw-r--r-- | sys/vm/vm_fault.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index 3dddc7a307d4..524aed2be2ff 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -1456,11 +1456,10 @@ vm_fault_getpages(struct faultstate *fs, int *behindp, int *aheadp) * and we could end up trying to pagein and pageout the same page * simultaneously. * - * We can theoretically allow the busy case on a read fault if the page - * is marked valid, but since such pages are typically already pmap'd, - * putting that special case in might be more effort then it is worth. - * We cannot under any circumstances mess around with a shared busied - * page except, perhaps, to pmap it. + * We allow the busy case on a read fault if the page is valid. We + * cannot under any circumstances mess around with a shared busied + * page except, perhaps, to pmap it. This is controlled by the + * VM_ALLOC_SBUSY bit in the allocflags argument. */ static void vm_fault_busy_sleep(struct faultstate *fs, int allocflags) |