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Mon, 15 Sep 2025 14:12:48 GMT (envelope-from git) Date: Mon, 15 Sep 2025 14:12:48 GMT Message-Id: <202509151412.58FECmcW091256@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: f1b656f14464 - main - vm_fault_busy_sleep(): update comment after addition of allocflags arg List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-main@freebsd.org Sender: owner-dev-commits-src-main@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: f1b656f14464c2e3ec4ab2eeade3b00dce4bd459 Auto-Submitted: auto-generated The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=f1b656f14464c2e3ec4ab2eeade3b00dce4bd459 commit f1b656f14464c2e3ec4ab2eeade3b00dce4bd459 Author: Konstantin Belousov AuthorDate: 2025-09-15 00:52:47 +0000 Commit: Konstantin Belousov CommitDate: 2025-09-15 14:11:57 +0000 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 --- sys/vm/vm_fault.c | 9 ++++----- 1 file 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)