kswapd_try_to_sleep

Name:kswapd_try_to_sleep

Proto:static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_order, unsigned int classzone_idx)

Type:void

Parameter:

Type	Parameter	Name
pg_data_t *	pgdat
int	alloc_order
int	reclaim_order
unsigned int	classzone_idx

3796

3797

DEFINE_WAIT(wait)

3799

If freezing(current process) || kthread_should_stop - should this kthread return now?* When someone calls kthread_stop() on your kthread, it will be woken* and this will return true. You should then return, and your return* value will be passed through to kthread_stop(). Then Return

3802

Note: we use "set_current_state()" _after_ the wait-queue add,* because we need a memory barrier there on SMP, so that any* wake-function that tests for the wait-queue being active* will be guaranteed to see waitqueue addition _or_ subsequent

3811

If Prepare kswapd for sleeping. This verifies that there are no processes* waiting in throttle_direct_reclaim() and that watermarks have been met.* Returns true if kswapd is ready to sleep Then

3818

reset_isolation_suitable(pgdat)

3824

wakeup_kcompactd(pgdat, alloc_order, classzone_idx)

3826

remaining = schedule_timeout - sleep until timeout*@timeout: timeout value in jiffies* Make the current task sleep until @timeout jiffies have* elapsed

3833

If remaining Then

3834

kswapd_classzone_idx = kswapd_classzone_idx(pgdat, classzone_idx)

3835

kswapd_order = max - return maximum of two values of the same or compatible types*@x: first value*@y: second value(kswapd_order, reclaim_order)

3838

sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.

3839

Note: we use "set_current_state()" _after_ the wait-queue add,* because we need a memory barrier there on SMP, so that any* wake-function that tests for the wait-queue being active* will be guaranteed to see waitqueue addition _or_ subsequent

3846

If Not remaining && Prepare kswapd for sleeping. This verifies that there are no processes* waiting in throttle_direct_reclaim() and that watermarks have been met.* Returns true if kswapd is ready to sleep Then

3848

trace_mm_vmscan_kswapd_sleep(node_id)

3860

If Not kthread_should_stop - should this kthread return now?* When someone calls kthread_stop() on your kthread, it will be woken* and this will return true. You should then return, and your return* value will be passed through to kthread_stop(). Then schedule()

3864

Else

3865

If remaining Then Disable counters

3867

Else Disable counters

3870

sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.

**Caller**
Name	Describe
kswapd	The background pageout daemon, started as a kernel thread* from the init process.* This basically trickles out pages so that we have _some_* free memory available even if there is no other activity* that frees anything up

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