From 825d80e01c65efad6bfe7302038a657bbc08e06a Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Thu, 7 Apr 2016 04:23:25 +0000
Subject: Add four new RCTL resources - readbps, readiops, writebps and
 writeiops, for limiting disk (actually filesystem) IO.

Note that in some cases these limits are not quite precise. It's ok,
as long as it's within some reasonable bounds.

Testing - and review of the code, in particular the VFS and VM parts - is
very welcome.

MFC after:	1 month
Relnotes:	yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D5080
---
 sys/vm/vm_fault.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'sys/vm/vm_fault.c')

diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index a7e3d37..13a5757 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -83,6 +83,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/lock.h>
 #include <sys/mman.h>
 #include <sys/proc.h>
+#include <sys/racct.h>
 #include <sys/resourcevar.h>
 #include <sys/rwlock.h>
 #include <sys/sysctl.h>
@@ -994,6 +995,21 @@ vnode_locked:
 	if (hardfault) {
 		PCPU_INC(cnt.v_io_faults);
 		curthread->td_ru.ru_majflt++;
+#ifdef RACCT
+		if (racct_enable && fs.object->type == OBJT_VNODE) {
+			PROC_LOCK(curproc);
+			if ((fault_type & (VM_PROT_COPY | VM_PROT_WRITE)) != 0) {
+				racct_add_force(curproc, RACCT_WRITEBPS,
+				    PAGE_SIZE + behind * PAGE_SIZE);
+				racct_add_force(curproc, RACCT_WRITEIOPS, 1);
+			} else {
+				racct_add_force(curproc, RACCT_READBPS,
+				    PAGE_SIZE + ahead * PAGE_SIZE);
+				racct_add_force(curproc, RACCT_READIOPS, 1);
+			}
+			PROC_UNLOCK(curproc);
+		}
+#endif
 	} else 
 		curthread->td_ru.ru_minflt++;
 
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