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Allow the bufdaemon and update daemon processes to skip the

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waitrunningbufspace() calls so that they are always able to
proceed and clean up buffer space.

Submitted by:	Brian Fundakowski Feldman <green@freebsd.org>
This commit is contained in:
Kirk McKusick 2003-11-04 06:30:00 +00:00
parent fe1e903532
commit 15a93fcc31
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122031
1 changed files with 8 additions and 4 deletions
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12
sys/kern/vfs_bio.c
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@ -72,6 +72,8 @@ struct buf_ops buf_ops_bio = {
*/
struct buf *buf; /* buffer header pool */
static struct proc *bufdaemonproc;
static void vm_hold_free_pages(struct buf * bp, vm_offset_t from,
vm_offset_t to);
static void vm_hold_load_pages(struct buf * bp, vm_offset_t from,
@ -888,9 +890,13 @@ bwrite(struct buf * bp)
* don't allow the async write to saturate the I/O
* system. We will not deadlock here because
* we are blocking waiting for I/O that is already in-progress
* to complete.
* to complete. We do not block here if it is the update
* or syncer daemon trying to clean up as that can lead
* to deadlock.
*/
waitrunningbufspace();
if (curthread->td_proc != bufdaemonproc &&
curthread->td_proc != updateproc)
waitrunningbufspace();
}
return (0);
@ -2040,8 +2046,6 @@ getnewbuf(int slpflag, int slptimeo, int size, int maxsize)
* take the load in an attempt to prevent getnewbuf() from blocking.
*/
static struct proc *bufdaemonproc;
static struct kproc_desc buf_kp = {
"bufdaemon",
buf_daemon,