[v2,12/14] paged_pages field is MEM_PAGING-only

Commit Message

Jan Beulich Feb. 23, 2022, 4:05 p.m. UTC

Conditionalize it and its uses accordingly.

Signed-off-by: Jan Beulich <[e-mail]>
Reviewed-by: Tamas K Lengyel <[e-mail]>
Reviewed-by: George Dunlap <[e-mail]>
---
v2: Re-base (drop clearing of field in getdomaininfo()).
---
I was on the edge of introducing a helper for
atomic_read(&d->paged_pages) but decided against because of
dump_domains() not being able to use it sensibly (I really want to omit
the output field altogether there when !MEM_PAGING).

Patch

--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1213,6 +1213,7 @@  int add_to_physmap(struct domain *sd, un
     }
     else
     {
+#ifdef CONFIG_MEM_PAGING
         /*
          * There is a chance we're plugging a hole where a paged out
          * page was.
@@ -1238,6 +1239,7 @@  int add_to_physmap(struct domain *sd, un
                 put_page(cpage);
             }
         }
+#endif
     }
 
     atomic_inc(&nr_saved_mfns);
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -691,11 +691,13 @@  p2m_add_page(struct domain *d, gfn_t gfn
             /* Count how man PoD entries we'll be replacing if successful */
             pod_count++;
         }
+#ifdef CONFIG_MEM_PAGING
         else if ( p2m_is_paging(ot) && (ot != p2m_ram_paging_out) )
         {
             /* We're plugging a hole in the physmap where a paged out page was */
             atomic_dec(&d->paged_pages);
         }
+#endif
     }
 
     /* Then, look for m->p mappings for this range and deal with them */
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -112,7 +112,9 @@  void getdomaininfo(struct domain *d, str
 #ifdef CONFIG_MEM_SHARING
     info->shr_pages         = atomic_read(&d->shr_pages);
 #endif
+#ifdef CONFIG_MEM_PAGING
     info->paged_pages       = atomic_read(&d->paged_pages);
+#endif
     info->shared_info_frame =
         gfn_x(mfn_to_gfn(d, _mfn(virt_to_mfn(d->shared_info))));
     BUG_ON(SHARED_M2P(info->shared_info_frame));
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -278,14 +278,18 @@  static void dump_domains(unsigned char k
 #ifdef CONFIG_MEM_SHARING
                " shared_pages=%u"
 #endif
+#ifdef CONFIG_MEM_PAGING
                " paged_pages=%u"
+#endif
                " dirty_cpus={%*pbl} max_pages=%u\n",
                domain_tot_pages(d), d->xenheap_pages,
 #ifdef CONFIG_MEM_SHARING
                atomic_read(&d->shr_pages),
 #endif
-               atomic_read(&d->paged_pages), CPUMASK_PR(d->dirty_cpumask),
-               d->max_pages);
+#ifdef CONFIG_MEM_PAGING
+               atomic_read(&d->paged_pages),
+#endif
+               CPUMASK_PR(d->dirty_cpumask), d->max_pages);
         printk("    handle=%02x%02x%02x%02x-%02x%02x-%02x%02x-"
                "%02x%02x-%02x%02x%02x%02x%02x%02x vm_assist=%08lx\n",
                d->handle[ 0], d->handle[ 1], d->handle[ 2], d->handle[ 3],
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -390,7 +390,9 @@  struct domain
     atomic_t         shr_pages;         /* shared pages */
 #endif
 
+#ifdef CONFIG_MEM_PAGING
     atomic_t         paged_pages;       /* paged-out pages */
+#endif
 
     /* Scheduling. */
     void            *sched_priv;    /* scheduler-specific data */