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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC][PATCH 2/2] Add hcall to probe Xen heap
For post-3.0.5 inclusion:
Add new domctl hypercall to expose current heap values. This functionality is
needed for probing how much memory is available in a given node prior to VM
creation.
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
diffstat output:
tools/libxc/xc_domain.c | 28 ++++++++++++++++++++++++++++
tools/libxc/xenctrl.h | 16 ++++++++++++++++
xen/common/domctl.c | 35 +++++++++++++++++++++++++++++++++++
xen/common/page_alloc.c | 9 +--------
xen/include/public/domctl.h | 16 ++++++++++++++++
xen/include/xen/mm.h | 10 ++++++++++
6 files changed, 106 insertions(+), 8 deletions(-)
Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>
---
Add new domctl hypercall to expose current heap values. This functionality is
needed for probing how much memory is available in a given node prior to VM
creation.
Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>
diff -r 48cbb32df526 tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c Thu Mar 29 21:55:42 2007 -0500
+++ b/tools/libxc/xc_domain.c Fri Mar 30 09:41:40 2007 -0500
@@ -584,6 +584,34 @@ int xc_domain_ioport_permission(int xc_h
domctl.u.ioport_permission.allow_access = allow_access;
return do_domctl(xc_handle, &domctl);
+}
+
+int xc_availheap(int xc_handle,
+ int zone_lo,
+ int zone_hi,
+ int node,
+ uint32_t *nr_zones,
+ uint32_t *nr_nodes,
+ uint64_t *pages)
+{
+ DECLARE_DOMCTL;
+ int rc = 0;
+
+ domctl.cmd = XEN_DOMCTL_availheap;
+ domctl.u.availheap.zone_lo = zone_lo;
+ domctl.u.availheap.zone_hi = zone_hi;
+ domctl.u.availheap.node = node;
+
+ rc = do_domctl(xc_handle, &domctl);
+ if ( rc >= 0 ) {
+ if (nr_zones)
+ *nr_zones = domctl.u.availheap.nr_zones;
+ if (nr_nodes)
+ *nr_nodes = domctl.u.availheap.nr_nodes;
+ *pages = domctl.u.availheap.pages;
+ }
+
+ return rc;
}
int xc_vcpu_setcontext(int xc_handle,
diff -r 48cbb32df526 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Thu Mar 29 21:55:42 2007 -0500
+++ b/tools/libxc/xenctrl.h Fri Mar 30 09:44:28 2007 -0500
@@ -611,6 +611,22 @@ int xc_get_pfn_type_batch(int xc_handle,
/* Get current total pages allocated to a domain. */
long xc_get_tot_pages(int xc_handle, uint32_t domid);
+/**
+ * This function retrieves the the number of pages available
+ * in the heap in a specific range of zones and nodes.
+ *
+ * @parm xc_handle a handle to an open hypervisor interface
+ * @parm domid the domain to query
+ * @parm zone_lo the starting zone to query
+ * @parm zone_lo the last zone to query
+ * @parm node the node to query
+ * @parm *nr_zones caller variable to put number of zones queried
+ * @parm *nr_nodes caller variable to put number of nodes queried
+ * @parm *pages caller variable to put total pages counted
+ * @return 0 on success, <0 on failure.
+ */
+int xc_availheap(int xc_handle, int zone_lo, int zone_hi, int node,
+ uint32_t *nr_zones, uint32_t *nr_nodes, uint64_t *pages);
/*
* Trace Buffer Operations
diff -r 48cbb32df526 xen/common/domctl.c
--- a/xen/common/domctl.c Thu Mar 29 21:55:42 2007 -0500
+++ b/xen/common/domctl.c Fri Mar 30 10:02:01 2007 -0500
@@ -24,6 +24,8 @@
#include <asm/current.h>
#include <public/domctl.h>
#include <acm/acm_hooks.h>
+#include <asm/numa.h>
+#include <xen/nodemask.h>
extern long arch_do_domctl(
struct xen_domctl *op, XEN_GUEST_HANDLE(xen_domctl_t) u_domctl);
@@ -711,6 +713,39 @@ long do_domctl(XEN_GUEST_HANDLE(xen_domc
}
break;
+ case XEN_DOMCTL_availheap:
+ {
+ int zone_lo = 0, zone_hi = NR_ZONES-1;
+
+ ret = -EINVAL;
+ if ( op->u.availheap.node >= num_online_nodes() )
+ break;
+ if ( op->u.availheap.zone_lo >= NR_ZONES )
+ break;
+ if ( op->u.availheap.zone_lo > op->u.availheap.zone_hi )
+ break;
+
+ if ( op->u.availheap.zone_lo > 0 )
+ zone_lo = op->u.availheap.zone_lo;
+ if ( op->u.availheap.zone_hi >= 0 && op->u.availheap.zone_hi <
NR_ZONES )
+ zone_hi = op->u.availheap.zone_hi;
+
+ op->u.availheap.nr_zones = zone_hi - zone_lo + 1;
+
+ ( op->u.availheap.node < 0 ) ?
+ (op->u.availheap.nr_nodes=num_online_nodes()) :
+ (op->u.availheap.nr_nodes=1);
+
+ op->u.availheap.pages =
+ avail_heap_pages(zone_lo, zone_hi, op->u.availheap.node);
+
+ if ( copy_to_guest(u_domctl, op, 1) )
+ ret = -EFAULT;
+ else
+ ret = 0;
+ }
+ break;
+
default:
ret = arch_do_domctl(op, u_domctl);
break;
diff -r 48cbb32df526 xen/common/page_alloc.c
--- a/xen/common/page_alloc.c Thu Mar 29 21:55:42 2007 -0500
+++ b/xen/common/page_alloc.c Fri Mar 30 10:00:25 2007 -0500
@@ -310,13 +310,6 @@ unsigned long alloc_boot_pages(
* BINARY BUDDY ALLOCATOR
*/
-#define MEMZONE_XEN 0
-#ifdef PADDR_BITS
-#define NR_ZONES (PADDR_BITS - PAGE_SHIFT)
-#else
-#define NR_ZONES (BITS_PER_LONG - PAGE_SHIFT)
-#endif
-
#define pfn_dom_zone_type(_pfn) (fls(_pfn) - 1)
typedef struct list_head heap_by_zone_and_order_t[NR_ZONES][MAX_ORDER+1];
@@ -544,7 +537,7 @@ void init_heap_pages(
}
}
-static unsigned long avail_heap_pages(
+unsigned long avail_heap_pages(
unsigned int zone_lo, unsigned int zone_hi, unsigned int node)
{
unsigned int i, zone, num_nodes = num_online_nodes();
diff -r 48cbb32df526 xen/include/public/domctl.h
--- a/xen/include/public/domctl.h Thu Mar 29 21:55:42 2007 -0500
+++ b/xen/include/public/domctl.h Thu Mar 29 22:29:43 2007 -0500
@@ -389,6 +389,21 @@ typedef struct xen_domctl_settimeoffset
typedef struct xen_domctl_settimeoffset xen_domctl_settimeoffset_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_settimeoffset_t);
+
+#define XEN_DOMCTL_availheap 37
+struct xen_domctl_availheap {
+ /* in */
+ int zone_lo; /* starting zone */
+ int zone_hi; /* ending zone, -1 for zone_lo to NR_ZONES */
+ int node; /* query available pages in node, -1 for all */
+ /* out */
+ uint32_t nr_zones; /* number of zones queried */
+ uint32_t nr_nodes; /* number of nodes queried */
+ uint64_t pages;
+};
+typedef struct xen_domctl_availheap xen_domctl_availheap_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_availheap_t);
+
#define XEN_DOMCTL_gethvmcontext 33
#define XEN_DOMCTL_sethvmcontext 34
@@ -457,6 +472,7 @@ struct xen_domctl {
struct xen_domctl_hvmcontext hvmcontext;
struct xen_domctl_address_size address_size;
struct xen_domctl_sendtrigger sendtrigger;
+ struct xen_domctl_availheap availheap;
uint8_t pad[128];
} u;
};
diff -r 48cbb32df526 xen/include/xen/mm.h
--- a/xen/include/xen/mm.h Thu Mar 29 21:55:42 2007 -0500
+++ b/xen/include/xen/mm.h Fri Mar 30 10:01:02 2007 -0500
@@ -33,6 +33,13 @@
#include <xen/list.h>
#include <xen/spinlock.h>
+#define MEMZONE_XEN 0
+#ifdef PADDR_BITS
+#define NR_ZONES (PADDR_BITS - PAGE_SHIFT)
+#else
+#define NR_ZONES (BITS_PER_LONG - PAGE_SHIFT)
+#endif
+
struct domain;
struct page_info;
@@ -64,6 +71,9 @@ unsigned long avail_domheap_pages(void);
unsigned long avail_domheap_pages(void);
#define alloc_domheap_page(d) (alloc_domheap_pages(d,0,0))
#define free_domheap_page(p) (free_domheap_pages(p,0))
+
+unsigned long avail_heap_pages(
+ unsigned int zone_lo, unsigned int zone_hi, unsigned int node);
void scrub_heap_pages(void);
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