[Xen-changelog] [xen-unstable] mem_event: add ref counting for free requestslots

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1315231809 -3600
# Node ID 083f10851dd85cf436eb4c26ac9afe78997b2bca
# Parent  7f357e1ef60adf1e43fad97d58721cc2c5309c42
mem_event: add ref counting for free requestslots

If mem_event_check_ring() is called by many vcpus at the same time
before any of them called also mem_event_put_request(), all of the
callers must assume there are enough free slots available in the ring.

Record the number of request producers in mem_event_check_ring() to
keep track of available free slots.

Add a new mem_event_put_req_producers() function to release a request
attempt made in mem_event_check_ring(). Its required for
p2m_mem_paging_populate() because that function can only modify the
p2m type if there are free request slots. But in some cases
p2m_mem_paging_populate() does not actually have to produce another
request when it is known that the same request was already made
earlier by a different vcpu.

mem_event_check_ring() can not return a reference to a free request
slot because there could be multiple references for different vcpus
and the order of mem_event_put_request() calls is not known. As a
result, incomplete requests could be consumed by the ring user.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---


diff -r 7f357e1ef60a -r 083f10851dd8 xen/arch/x86/mm/mem_event.c
--- a/xen/arch/x86/mm/mem_event.c       Mon Sep 05 15:09:24 2011 +0100
+++ b/xen/arch/x86/mm/mem_event.c       Mon Sep 05 15:10:09 2011 +0100
@@ -37,8 +37,6 @@
 #define mem_event_ring_lock(_d)       spin_lock(&(_d)->mem_event.ring_lock)
 #define mem_event_ring_unlock(_d)     spin_unlock(&(_d)->mem_event.ring_lock)
 
-#define MEM_EVENT_RING_THRESHOLD 4
-
 static int mem_event_enable(struct domain *d, mfn_t ring_mfn, mfn_t shared_mfn)
 {
     int rc;
@@ -109,6 +107,7 @@
     req_prod++;
 
     /* Update ring */
+    d->mem_event.req_producers--;
     front_ring->req_prod_pvt = req_prod;
     RING_PUSH_REQUESTS(front_ring);
 
@@ -153,11 +152,18 @@
     vcpu_sleep_nosync(v);
 }
 
+void mem_event_put_req_producers(struct domain *d)
+{
+    mem_event_ring_lock(d);
+    d->mem_event.req_producers--;
+    mem_event_ring_unlock(d);
+}
+
 int mem_event_check_ring(struct domain *d)
 {
     struct vcpu *curr = current;
     int free_requests;
-    int ring_full;
+    int ring_full = 1;
 
     if ( !d->mem_event.ring_page )
         return -1;
@@ -165,12 +171,11 @@
     mem_event_ring_lock(d);
 
     free_requests = RING_FREE_REQUESTS(&d->mem_event.front_ring);
-    if ( unlikely(free_requests < 2) )
+    if ( d->mem_event.req_producers < free_requests )
     {
-        gdprintk(XENLOG_INFO, "free request slots: %d\n", free_requests);
-        WARN_ON(free_requests == 0);
+        d->mem_event.req_producers++;
+        ring_full = 0;
     }
-    ring_full = free_requests < MEM_EVENT_RING_THRESHOLD ? 1 : 0;
 
     if ( (curr->domain->domain_id == d->domain_id) && ring_full )
     {
diff -r 7f357e1ef60a -r 083f10851dd8 xen/arch/x86/mm/mem_sharing.c
--- a/xen/arch/x86/mm/mem_sharing.c     Mon Sep 05 15:09:24 2011 +0100
+++ b/xen/arch/x86/mm/mem_sharing.c     Mon Sep 05 15:10:09 2011 +0100
@@ -281,7 +281,6 @@
     vcpu_pause_nosync(v);
     req.flags |= MEM_EVENT_FLAG_VCPU_PAUSED;
 
-    /* XXX: Need to reserve a request, not just check the ring! */
     if(mem_event_check_ring(d)) return page;
 
     req.gfn = gfn;
diff -r 7f357e1ef60a -r 083f10851dd8 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Mon Sep 05 15:09:24 2011 +0100
+++ b/xen/arch/x86/mm/p2m.c     Mon Sep 05 15:10:09 2011 +0100
@@ -803,6 +803,7 @@
     else if ( p2mt != p2m_ram_paging_out && p2mt != p2m_ram_paged )
     {
         /* gfn is already on its way back and vcpu is not paused */
+        mem_event_put_req_producers(d);
         return;
     }
 
diff -r 7f357e1ef60a -r 083f10851dd8 xen/include/asm-x86/mem_event.h
--- a/xen/include/asm-x86/mem_event.h   Mon Sep 05 15:09:24 2011 +0100
+++ b/xen/include/asm-x86/mem_event.h   Mon Sep 05 15:10:09 2011 +0100
@@ -27,6 +27,7 @@
 /* Pauses VCPU while marking pause flag for mem event */
 void mem_event_mark_and_pause(struct vcpu *v);
 int mem_event_check_ring(struct domain *d);
+void mem_event_put_req_producers(struct domain *d);
 void mem_event_put_request(struct domain *d, mem_event_request_t *req);
 void mem_event_get_response(struct domain *d, mem_event_response_t *rsp);
 void mem_event_unpause_vcpus(struct domain *d);
diff -r 7f357e1ef60a -r 083f10851dd8 xen/include/xen/sched.h
--- a/xen/include/xen/sched.h   Mon Sep 05 15:09:24 2011 +0100
+++ b/xen/include/xen/sched.h   Mon Sep 05 15:10:09 2011 +0100
@@ -183,6 +183,7 @@
 {
     /* ring lock */
     spinlock_t ring_lock;
+    unsigned int req_producers;
     /* shared page */
     mem_event_shared_page_t *shared_page;
     /* shared ring page */

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