bufspace_wait(): only try to help bufdaemon if there is a chance to help

Only call buf_flush() if there are some dirty buffers belonging to the
vnode we are allocating the buffer for.  Otherwise the bd dirty queue
scan cannot find anything and it makes no sense to spend CPU doing it.

This commit is contained in:

Konstantin Belousov

2026-04-22 08:09:34 +03:00

parent f9458655e7

commit 067cfac2e7

1 changed files with 2 additions and 1 deletions

									
										sys/kern/vfs_bio.c
									
		+2
		-1
	
												View File
												
				@@ -727,7 +727,8 @@ bufspace_wait(struct bufdomain *bd, struct vnode *vp, int gbflags,

					BD_LOCK(bd);

					while (bd->bd_wanted) {

						if (vp != NULL && vp->v_type != VCHR &&

						    (td->td_pflags & TDP_BUFNEED) == 0) {

						    (td->td_pflags & TDP_BUFNEED) == 0 &&

						    vp->v_bufobj.bo_dirty.bv_cnt > 0) {

							BD_UNLOCK(bd);

							/*

							 * getblk() is called with a vnode locked, and