git: aec3c884057a - stable/13 - buf: Dynamically allocate per-CPU buffer queues

The branch stable/13 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=aec3c884057ab3f95e8c88a346694966df637303

commit aec3c884057ab3f95e8c88a346694966df637303
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2023-05-10 14:05:32 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2023-05-11 13:32:32 +0000

    buf: Dynamically allocate per-CPU buffer queues
    
    To reduce static bloat.  No functional change intended.
    
    PR:             269572
    Reviewed by:    mjg, kib, emaste
    MFC after:      2 weeks
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D39808
    
    (cherry picked from commit e72f7ed43eefaf305c33c232bc2c33d997427f58)
---
 sys/kern/vfs_bio.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index 174a6e0b556a..cb94dbd81021 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -116,7 +116,7 @@ struct bufqueue {
 #define	BQ_ASSERT_LOCKED(bq)	mtx_assert(BQ_LOCKPTR((bq)), MA_OWNED)
 
 struct bufdomain {
-	struct bufqueue	bd_subq[MAXCPU + 1]; /* Per-cpu sub queues + global */
+	struct bufqueue	*bd_subq;
 	struct bufqueue bd_dirtyq;
 	struct bufqueue	*bd_cleanq;
 	struct mtx_padalign bd_run_lock;
@@ -1901,6 +1901,9 @@ bd_init(struct bufdomain *bd)
 {
 	int i;
 
+	/* Per-CPU clean buf queues, plus one global queue. */
+	bd->bd_subq = mallocarray(mp_maxid + 2, sizeof(struct bufqueue),
+	    M_BIOBUF, M_WAITOK | M_ZERO);
 	bd->bd_cleanq = &bd->bd_subq[mp_maxid + 1];
 	bq_init(bd->bd_cleanq, QUEUE_CLEAN, mp_maxid + 1, "bufq clean lock");
 	bq_init(&bd->bd_dirtyq, QUEUE_DIRTY, -1, "bufq dirty lock");