From: Ben Gras <ben@minix3.org>
Date: Sat, 26 Nov 2011 15:12:17 +0000 (+0000)
Subject: vm: report cropped region sizes
X-Git-Tag: v3.2.0~218
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/style.css?a=commitdiff_plain;h=ef99a7a3dc55280fff9eb4a4755a5dde7cf37ee1;p=minix.git

vm: report cropped region sizes

	. when reporting on regions, only report part of the
	  region (addr and length) that really has memory mapped
	  into it
	. to minimise core files
---

diff --git a/servers/vm/region.c b/servers/vm/region.c
index c44062f85..2d63e1954 100644
--- a/servers/vm/region.c
+++ b/servers/vm/region.c
@@ -1991,9 +1991,19 @@ PUBLIC int get_region_info(struct vmproc *vmp, struct vm_region_info *vri,
 	if(!(vr = region_get_iter(&v_iter))) return 0;
 
 	for(count = 0; (vr = region_get_iter(&v_iter)) && count < max; count++, vri++) {
-		vri->vri_addr = arch_map2info(vmp, vr->vaddr, &vri->vri_seg,
-			&vri->vri_prot);
-		vri->vri_length = vr->length;
+		struct phys_region *ph1, *ph2;
+
+		/* Report part of the region that's actually in use. */
+
+		/* Get first and last phys_regions, if any */
+		ph1 = physr_search_least(vr->phys);
+		ph2 = physr_search_greatest(vr->phys);
+		if(!ph1 || !ph2) { assert(!ph1 && !ph2); continue; }
+
+		/* Report start+length of region starting from lowest use. */
+		vri->vri_addr = arch_map2info(vmp, vr->vaddr + ph1->offset,
+			&vri->vri_seg, &vri->vri_prot);
+		vri->vri_length = ph2->offset + ph2->ph->length - ph1->offset;
 
 		/* "AND" the provided protection with per-page protection. */
 		if (!(vr->flags & VR_WRITABLE))