简介

在linux的代码里有一个注释如下；
If softirq window is exhausted then punt. 少个逗号，加上 If softirq window is exhausted, then punt.
使用bing翻译是：如果 softirq 窗口用尽，则 punt。
这里的punt没有翻译出来。这一句的灵魂就在于punt，结果没有翻译出来。

static __latent_entropy void net_rx_action(struct softirq_action *h)
{
。。。。。/* If softirq window is exhausted then punt.* Allow this to run for 2 jiffies since which will allow* an average latency of 1.5/HZ.*/if (unlikely(budget <= 0 ||time_after_eq(jiffies, time_limit))) {sd->time_squeeze++;break;}

这就没办法了，就只能查字典

字典

punt *[pʌnt]
n. 方头平底船, 踢悬空球, 赌博者
vt. 踢悬空球, 用篙撑船, 赌博
vi. 踢悬空球, 用篙撑船, 赌博
n long shallow flat-bottomed boat with square ends that is moved by pushing the end of a long pole against the bottom of a river （用篙撑的）长而浅的方头平底船.

v (a) [I, Ipr, Ip] move a punt with a pole (in the specified direction) 用篙撑方头平底船: She soon learned to punt. 她很快就学会了撑方头平底船. * They punted along the river. 他们撑着方头平底船沿河航行. (b) [I] (often 常作 go punting) go along a river in a punt, esp for pleasure 乘方头平底船沿河航行（尤指游览）.

v [Tn] kick (a football) after it has dropped from the hands and before it touches the ground 踢（从手中落下而未着地之足球）; 踢（悬空球）.

n kick made in this way 踢悬空球.

v [I] 1 (in some card-games) lay a stake against the bank （在某些牌戏中）对庄家下赌注. 2 (infml 口 esp Brit) speculate in shares, bet money on a horse, etc; gamble 进行股票投机、对赛马下赌注等; 赌博.

解释

从字面的理解就是踢悬空球，不知道这个词的词源是怎么来的；感觉更像是一个形音词；在球从手上下落，然后在落地之前踢一脚之后的声音“嗙特”。在球落地之前来一脚，意味着不落地，直接踢出去了。
下面这个赌博的意思是说，这个球不落地。其实对于这个球来说有“不落地，急转弯”的引申。

If softirq window is exhausted, then punt.
再回来这么理解：如果softirq的窗口被消耗完，则返回。

另一个

static int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,unsigned int nr_pages)
{
。。。。/** If the hierarchy is above the normal consumption range, schedule* reclaim on returning to userland.  We can perform reclaim here* if __GFP_RECLAIM but let's always punt for simplicity and so that* GFP_KERNEL can consistently be used during reclaim.  @memcg is* not recorded as it most likely matches current's and won't* change in the meantime.  As high limit is checked again before* reclaim, the cost of mismatch is negligible.*/do {bool mem_high, swap_high;

另一个

踢悬空球，踢回去。直接返回的意思。

static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flags *rf,int dest_cpu, unsigned int flags)
{
。。。。if (task_running(rq, p) || READ_ONCE(p->__state) == TASK_WAKING) {/** MIGRATE_ENABLE gets here because 'p == current', but for* anything else we cannot do is_migration_disabled(), punt* and have the stopper function handle it all race-free.*/stop_pending = pending->stop_pending;if (!stop_pending)pending->stop_pending = true;