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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-11-21 10:26:44 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-21 10:26:44 -0800 |
| commit | 551eaff1b384cc107eab6332ba8424b3ca1f304b (patch) | |
| tree | 02c90fa7a5ea2f6ebdf34004ae20f9c403e5820c /net/core | |
| parent | 20a95a2169d1cd3da50cf65ba882d0e27a4a2d4f (diff) | |
| download | blackbird-op-linux-551eaff1b384cc107eab6332ba8424b3ca1f304b.tar.gz blackbird-op-linux-551eaff1b384cc107eab6332ba8424b3ca1f304b.zip | |
pktgen: allow faster module unload
Unloading pktgen module needs ~6 seconds on a 64 cpus machine, to stop
64 kthreads.
Add a pktgen_exiting variable to let kernel threads die faster, so that
kthread_stop() doesnt have to wait too long for them. This variable is
not tested in fast path.
Note : Before exiting from pktgen_thread_worker(), we must make sure
kthread_stop() is waiting for this thread to be stopped, like its done
in kernel/softirq.c
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/pktgen.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 52fc1e08a7c4..2e57830cbeb2 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -395,6 +395,8 @@ struct pktgen_hdr { __be32 tv_usec; }; +static bool pktgen_exiting __read_mostly; + struct pktgen_thread { spinlock_t if_lock; /* for list of devices */ struct list_head if_list; /* All device here */ @@ -3451,11 +3453,6 @@ static void pktgen_rem_thread(struct pktgen_thread *t) remove_proc_entry(t->tsk->comm, pg_proc_dir); - mutex_lock(&pktgen_thread_lock); - - list_del(&t->th_list); - - mutex_unlock(&pktgen_thread_lock); } static void pktgen_resched(struct pktgen_dev *pkt_dev) @@ -3602,6 +3599,8 @@ static int pktgen_thread_worker(void *arg) pkt_dev = next_to_run(t); if (unlikely(!pkt_dev && t->control == 0)) { + if (pktgen_exiting) + break; wait_event_interruptible_timeout(t->queue, t->control != 0, HZ/10); @@ -3654,6 +3653,13 @@ static int pktgen_thread_worker(void *arg) pr_debug("%s removing thread\n", t->tsk->comm); pktgen_rem_thread(t); + /* Wait for kthread_stop */ + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + } + __set_current_state(TASK_RUNNING); + return 0; } @@ -3928,6 +3934,7 @@ static void __exit pg_cleanup(void) struct list_head *q, *n; /* Stop all interfaces & threads */ + pktgen_exiting = true; list_for_each_safe(q, n, &pktgen_threads) { t = list_entry(q, struct pktgen_thread, th_list); |
