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authormdf <mdf@FreeBSD.org>2011-01-27 00:34:12 +0000
committermdf <mdf@FreeBSD.org>2011-01-27 00:34:12 +0000
commit7fc649fc41274dcd3ffbed0d354a418b71e65786 (patch)
treee4eadeb1ff33d6db2e7b3001b1b8a9e9c21e2a2f /sys/vm/vm_reserv.c
parent886222db75f8a2f0e19f97934a5375f602e0987a (diff)
downloadFreeBSD-src-7fc649fc41274dcd3ffbed0d354a418b71e65786.zip
FreeBSD-src-7fc649fc41274dcd3ffbed0d354a418b71e65786.tar.gz
Explicitly wire the user buffer rather than doing it implicitly in
sbuf_new_for_sysctl(9). This allows using an sbuf with a SYSCTL_OUT drain for extremely large amounts of data where the caller knows that appropriate references are held, and sleeping is not an issue. Inspired by: rwatson
Diffstat (limited to 'sys/vm/vm_reserv.c')
-rw-r--r--sys/vm/vm_reserv.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/vm/vm_reserv.c b/sys/vm/vm_reserv.c
index d6cbc83..fec0539 100644
--- a/sys/vm/vm_reserv.c
+++ b/sys/vm/vm_reserv.c
@@ -182,6 +182,9 @@ sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS)
vm_reserv_t rv;
int counter, error, level, unused_pages;
+ error = sysctl_wire_old_buffer(req, 0);
+ if (error != 0)
+ return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
sbuf_printf(&sbuf, "\nLEVEL SIZE NUMBER\n\n");
for (level = -1; level <= VM_NRESERVLEVEL - 2; level++) {
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