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Use dedicated lock name for pbufs

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Also remove a pointer to array variable, use array address directly.

Reviewed by:	markj, mckusick
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D34072
This commit is contained in:
Konstantin Belousov 2022-01-23 02:24:12 +02:00
parent 9cd59de2e1
commit 531f8cfea0
3 changed files with 12 additions and 12 deletions
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14
sys/kern/vfs_bio.c
View file

@ -400,12 +400,6 @@ struct bufqueue __exclusive_cache_line bqempty;
*/
uma_zone_t buf_zone;
/*
* Single global constant for BUF_WMESG, to avoid getting multiple references.
* buf_wmesg is referred from macros.
*/
const char *buf_wmesg = BUF_WMESG;
static int
sysctl_runningspace(SYSCTL_HANDLER_ARGS)
{
@ -1184,6 +1178,12 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est)
return (v);
}
/*
* Single global constant for BUF_WMESG, to avoid getting multiple
* references.
*/
static const char buf_wmesg[] = "bufwait";
/* Initialize the buffer subsystem. Called before use of any buffers. */
void
bufinit(void)
@ -1214,7 +1214,7 @@ bufinit(void)
bp->b_xflags = 0;
bp->b_data = bp->b_kvabase = unmapped_buf;
LIST_INIT(&bp->b_dep);
BUF_LOCKINIT(bp);
BUF_LOCKINIT(bp, buf_wmesg);
bq_insert(&bqempty, bp, false);
}

6
sys/sys/buf.h
View file

@ -292,16 +292,14 @@ struct buf {
/*
* Buffer locking
*/
extern const char *buf_wmesg; /* Default buffer lock message */
#define BUF_WMESG "bufwait"
#include <sys/proc.h> /* XXX for curthread */
#include <sys/mutex.h>
/*
* Initialize a lock.
*/
#define BUF_LOCKINIT(bp) \
lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, LK_NEW)
#define BUF_LOCKINIT(bp, wmesg) \
lockinit(&(bp)->b_lock, PRIBIO + 4, wmesg, 0, LK_NEW)
/*
*
* Get a lock sleeping non-interruptably until it becomes available.

4
sys/vm/vm_pager.c
View file

@ -489,6 +489,8 @@ pbuf_dtor(void *mem, int size, void *arg)
BUF_UNLOCK(bp);
}
static const char pbuf_wmesg[] = "pbufwait";
static int
pbuf_init(void *mem, int size, int flags)
{
@ -498,7 +500,7 @@ pbuf_init(void *mem, int size, int flags)
if (bp->b_kvabase == NULL)
return (ENOMEM);
bp->b_kvasize = ptoa(PBUF_PAGES);
BUF_LOCKINIT(bp);
BUF_LOCKINIT(bp, pbuf_wmesg);
LIST_INIT(&bp->b_dep);
bp->b_rcred = bp->b_wcred = NOCRED;
bp->b_xflags = 0;