Skip to content

Commit

Permalink
[PATCH] taskstats: factor out reply assembling
Browse files Browse the repository at this point in the history
Introduce mk_reply() helper which does all nla_put()s on reply.

Saves 453 bytes and a preparation for the next patch.

Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Shailabh Nagar <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Jay Lan <[email protected]>
Cc: Thomas Graf <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
  • Loading branch information
Oleg Nesterov authored and Linus Torvalds committed Dec 7, 2006
1 parent 34ec123 commit 68062b8
Showing 1 changed file with 28 additions and 27 deletions.
55 changes: 28 additions & 27 deletions kernel/taskstats.c
Original file line number Diff line number Diff line change
Expand Up @@ -343,14 +343,32 @@ static int parse(struct nlattr *na, cpumask_t *mask)
return ret;
}

static int mk_reply(struct sk_buff *skb, int type, u32 pid, struct taskstats *stats)
{
struct nlattr *na;
int aggr;

aggr = TASKSTATS_TYPE_AGGR_TGID;
if (type == TASKSTATS_TYPE_PID)
aggr = TASKSTATS_TYPE_AGGR_PID;

na = nla_nest_start(skb, aggr);
NLA_PUT_U32(skb, type, pid);
NLA_PUT_TYPE(skb, struct taskstats, TASKSTATS_TYPE_STATS, *stats);
nla_nest_end(skb, na);

return 0;
nla_put_failure:
return -1;
}

static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
int rc = 0;
struct sk_buff *rep_skb;
struct taskstats stats;
void *reply;
size_t size;
struct nlattr *na;
cpumask_t mask;

rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], &mask);
Expand Down Expand Up @@ -382,27 +400,21 @@ static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
if (rc < 0)
goto err;

na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID);
NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, pid);
NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
stats);
if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid, &stats))
goto nla_put_failure;
} else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) {
u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]);
rc = fill_tgid(tgid, NULL, &stats);
if (rc < 0)
goto err;

na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID);
NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, tgid);
NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
stats);
if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid, &stats))
goto nla_put_failure;
} else {
rc = -EINVAL;
goto err;
}

nla_nest_end(rep_skb, na);

return send_reply(rep_skb, info->snd_pid);

nla_put_failure:
Expand Down Expand Up @@ -446,7 +458,6 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
void *reply;
size_t size;
int is_thread_group;
struct nlattr *na;

if (!family_registered)
return;
Expand Down Expand Up @@ -481,27 +492,17 @@ void taskstats_exit(struct task_struct *tsk, int group_dead)
if (rc < 0)
goto err_skb;

na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID);
NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, (u32)tsk->pid);
NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
*tidstats);
nla_nest_end(rep_skb, na);

if (!is_thread_group)
goto send;
if (mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid, tidstats))
goto nla_put_failure;

/*
* Doesn't matter if tsk is the leader or the last group member leaving
*/
if (!group_dead)
if (!is_thread_group || !group_dead)
goto send;

na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID);
NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, (u32)tsk->tgid);
/* No locking needed for tsk->signal->stats since group is dead */
NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS,
*tsk->signal->stats);
nla_nest_end(rep_skb, na);
if (mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid, tsk->signal->stats))
goto nla_put_failure;

send:
send_cpu_listeners(rep_skb, listeners);
Expand Down

0 comments on commit 68062b8

Please sign in to comment.