Index: sys/arch/amd64/amd64/machdep.c
===================================================================
RCS file: /cvsroot/src/sys/arch/amd64/amd64/machdep.c,v
retrieving revision 1.243
diff -u -r1.243 machdep.c
--- sys/arch/amd64/amd64/machdep.c 23 Dec 2016 07:15:27 -0000 1.243
+++ sys/arch/amd64/amd64/machdep.c 26 Dec 2016 11:19:10 -0000
@@ -1468,30 +1468,39 @@
static void
init_x86_64_msgbuf(void)
{
- /* Message buffer is located at end of core. */
- psize_t reqsz = round_page(MSGBUFSIZE);
- psize_t sz = 0;
-
- for (sz = 0; sz < reqsz; sz += PAGE_SIZE) {
- paddr_t stolenpa;
-
- if (!uvm_page_physget(&stolenpa))
- break;
-
- if (stolenpa == (msgbuf_p_seg[msgbuf_p_cnt].paddr
- + PAGE_SIZE)) {
- /* contiguous: append it to current buf alloc */
- msgbuf_p_seg[msgbuf_p_cnt].sz += PAGE_SIZE;
- } else {
- /* non-contiguous: start a new msgbuf seg */
- msgbuf_p_seg[msgbuf_p_cnt].sz = PAGE_SIZE;
- msgbuf_p_seg[msgbuf_p_cnt++].paddr = stolenpa;
- }
+ /* Message buffer is located at end of core. */
+ psize_t sz = round_page(MSGBUFSIZE);
+ psize_t reqsz = sz;
+ uvm_physseg_t x;
+
+ search_again:
+ x = uvm_physseg_get_last();
+
+ /* Shrink so it'll fit in the last segment. */
+ if (uvm_physseg_get_avail_end(x) - uvm_physseg_get_avail_start(x) < atop(sz))
+ sz = ctob(uvm_physseg_get_avail_end(x) - uvm_physseg_get_avail_start(x));
+
+ uvm_physseg_unplug(uvm_physseg_get_end(x) - atop(sz), atop(sz));
+ msgbuf_p_seg[msgbuf_p_cnt].sz = sz;
+ msgbuf_p_seg[msgbuf_p_cnt++].paddr = ctob(uvm_physseg_get_avail_end(x));
+
+ /* Now find where the new avail_end is. */
+ avail_end = ctob(uvm_physseg_get_avail_end(x));
+
+ if (sz == reqsz)
+ return;
+
+ reqsz -= sz;
+
+ if (msgbuf_p_cnt == VM_PHYSSEG_MAX) {
+ /* No more segments available, bail out. */
+ printf("WARNING: MSGBUFSIZE (%zu) too large, using %zu.\n",
+ (size_t)MSGBUFSIZE, (size_t)(MSGBUFSIZE - reqsz));
+ return;
}
- if (sz != reqsz)
- printf("%s: could only allocate %ld bytes of requested %ld bytes\n",
- __func__, sz, reqsz);
+ sz = reqsz;
+ goto search_again;
}
static void
