diff options
| author | Olaf Hering <olaf@aepfle.de> | 2013-08-06 20:55:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 12:03:31 -0700 |
| commit | 269ce62bbc00c4e80bf3ca2aa21823f20625bcf6 (patch) | |
| tree | 357ff8f61092daf5c861ce13f7d1ec0a647a95d9 /tools/hv/hv_vss_daemon.c | |
| parent | 58125210ab3b202917c04fca014317944d464ea0 (diff) | |
| download | lwn-269ce62bbc00c4e80bf3ca2aa21823f20625bcf6.tar.gz lwn-269ce62bbc00c4e80bf3ca2aa21823f20625bcf6.zip | |
Tools: hv: use single send+recv buffer
send_buffer is used only once during registration. To reduce runtime
memory usage reuse the recv_buffer for registration. Also use
NLMSG_LENGTH instead of NLMSG_HDRLEN to take alignment into account.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/hv/hv_vss_daemon.c')
| -rw-r--r-- | tools/hv/hv_vss_daemon.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c index 8611962c672c..8bcb04096eb2 100644 --- a/tools/hv/hv_vss_daemon.c +++ b/tools/hv/hv_vss_daemon.c @@ -140,7 +140,6 @@ int main(void) struct cn_msg *incoming_cn_msg; int op; struct hv_vss_msg *vss_msg; - char *vss_send_buffer; char *vss_recv_buffer; size_t vss_recv_buffer_len; @@ -150,10 +149,9 @@ int main(void) openlog("Hyper-V VSS", 0, LOG_USER); syslog(LOG_INFO, "VSS starting; pid is:%d", getpid()); - vss_recv_buffer_len = NLMSG_HDRLEN + sizeof(struct cn_msg) + sizeof(struct hv_vss_msg); - vss_send_buffer = calloc(1, vss_recv_buffer_len); + vss_recv_buffer_len = NLMSG_LENGTH(0) + sizeof(struct cn_msg) + sizeof(struct hv_vss_msg); vss_recv_buffer = calloc(1, vss_recv_buffer_len); - if (!(vss_send_buffer && vss_recv_buffer)) { + if (!vss_recv_buffer) { syslog(LOG_ERR, "Failed to allocate netlink buffers"); exit(EXIT_FAILURE); } @@ -185,7 +183,7 @@ int main(void) /* * Register ourselves with the kernel. */ - message = (struct cn_msg *)vss_send_buffer; + message = (struct cn_msg *)vss_recv_buffer; message->id.idx = CN_VSS_IDX; message->id.val = CN_VSS_VAL; message->ack = 0; |