linux-5.15/kcompactd()
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開始行:
*参照元 [#g5f1b261]
#backlinks
*説明 [#u580f8e1]
-パス: [[linux-5.15/mm/compaction.c]]
-kcompactdのスレッドメイン関数
**引数 [#kc412fe3]
-void *p
--メモリノード。pg_data_t型のポインタを指定する。
--[[linux-5.15/pg_data_t]]
**返り値 [#h05b60fb]
-int
--常に0、基本的に終了しないので意味は特に無い。
**参考 [#h9ea645c]
*実装 [#v0fcdc16]
/*
* The background compaction daemon, started as a kernel...
* from the init process.
*/
static int kcompactd(void *p)
{
pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
long default_timeout = msecs_to_jiffies(HPAGE_FRAG_CHEC...
long timeout = default_timeout;
const struct cpumask *cpumask = cpumask_of_node(pgdat->...
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
set_freezable();
-
--[[linux-5.15/pg_data_t]]
--[[linux-5.15/task_struct]]
--[[linux-5.15/msecs_to_jiffies()]]
--[[linux-5.15/cpumask]]
--[[linux-5.15/cpumask_of_node()]]
--[[linux-5.15/cpumask_empty()]]
--[[linux-5.15/set_cpus_allowed_ptr()]]
--[[linux-5.15/set_freezable()]]
pgdat->kcompactd_max_order = 0;
pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1;
while (!kthread_should_stop()) {
unsigned long pflags;
/*
* Avoid the unnecessary wakeup for proactive compaction
* when it is disabled.
*/
if (!sysctl_compaction_proactiveness)
timeout = MAX_SCHEDULE_TIMEOUT;
trace_mm_compaction_kcompactd_sleep(pgdat->node_id);
if (wait_event_freezable_timeout(pgdat->kcompactd_wait,
kcompactd_work_requested(pgdat), timeout) &&
!pgdat->proactive_compact_trigger) {
-
--[[linux-5.15/kthread_should_stop()]]
--[[linux-5.15/trace_mm_compaction_kcompactd_sleep()]]
--[[linux-5.15/wait_freezable_timeout()]]
--[[linux-5.15/kcompactd_work_requested()]]
psi_memstall_enter(&pflags);
kcompactd_do_work(pgdat);
psi_memstall_leave(&pflags);
/*
* Reset the timeout value. The defer timeout from
* proactive compaction is lost here but that is fine
* as the condition of the zone changing substantiona...
* then carrying on with the previous defer interval is
* not useful.
*/
timeout = default_timeout;
continue;
}
-
--[[linux-5.15/psi_memstall_enter()]]
--[[linux-5.15/kcompactd_do_work()]]
--[[linux-5.15/psi_memstall_leave()]]
/*
* Start the proactive work with default timeout. Based
* on the fragmentation score, this timeout is updated.
*/
timeout = default_timeout;
if (should_proactive_compact_node(pgdat)) {
unsigned int prev_score, score;
prev_score = fragmentation_score_node(pgdat);
proactive_compact_node(pgdat);
score = fragmentation_score_node(pgdat);
/*
* Defer proactive compaction if the fragmentation
* score did not go down i.e. no progress made.
*/
if (unlikely(score >= prev_score))
timeout =
default_timeout << COMPACT_MAX_DEFER_SHIFT;
}
if (unlikely(pgdat->proactive_compact_trigger))
pgdat->proactive_compact_trigger = false;
-
--[[linux-5.15/should_proactive_compact_node()]]
--[[linux-5.15/fragmentation_score_node()]]
--[[linux-5.15/proactive_compact_node()]]
--[[linux-5.15/unlikely()]]
}
return 0;
}
*コメント [#cbc2437f]
終了行:
*参照元 [#g5f1b261]
#backlinks
*説明 [#u580f8e1]
-パス: [[linux-5.15/mm/compaction.c]]
-kcompactdのスレッドメイン関数
**引数 [#kc412fe3]
-void *p
--メモリノード。pg_data_t型のポインタを指定する。
--[[linux-5.15/pg_data_t]]
**返り値 [#h05b60fb]
-int
--常に0、基本的に終了しないので意味は特に無い。
**参考 [#h9ea645c]
*実装 [#v0fcdc16]
/*
* The background compaction daemon, started as a kernel...
* from the init process.
*/
static int kcompactd(void *p)
{
pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
long default_timeout = msecs_to_jiffies(HPAGE_FRAG_CHEC...
long timeout = default_timeout;
const struct cpumask *cpumask = cpumask_of_node(pgdat->...
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
set_freezable();
-
--[[linux-5.15/pg_data_t]]
--[[linux-5.15/task_struct]]
--[[linux-5.15/msecs_to_jiffies()]]
--[[linux-5.15/cpumask]]
--[[linux-5.15/cpumask_of_node()]]
--[[linux-5.15/cpumask_empty()]]
--[[linux-5.15/set_cpus_allowed_ptr()]]
--[[linux-5.15/set_freezable()]]
pgdat->kcompactd_max_order = 0;
pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1;
while (!kthread_should_stop()) {
unsigned long pflags;
/*
* Avoid the unnecessary wakeup for proactive compaction
* when it is disabled.
*/
if (!sysctl_compaction_proactiveness)
timeout = MAX_SCHEDULE_TIMEOUT;
trace_mm_compaction_kcompactd_sleep(pgdat->node_id);
if (wait_event_freezable_timeout(pgdat->kcompactd_wait,
kcompactd_work_requested(pgdat), timeout) &&
!pgdat->proactive_compact_trigger) {
-
--[[linux-5.15/kthread_should_stop()]]
--[[linux-5.15/trace_mm_compaction_kcompactd_sleep()]]
--[[linux-5.15/wait_freezable_timeout()]]
--[[linux-5.15/kcompactd_work_requested()]]
psi_memstall_enter(&pflags);
kcompactd_do_work(pgdat);
psi_memstall_leave(&pflags);
/*
* Reset the timeout value. The defer timeout from
* proactive compaction is lost here but that is fine
* as the condition of the zone changing substantiona...
* then carrying on with the previous defer interval is
* not useful.
*/
timeout = default_timeout;
continue;
}
-
--[[linux-5.15/psi_memstall_enter()]]
--[[linux-5.15/kcompactd_do_work()]]
--[[linux-5.15/psi_memstall_leave()]]
/*
* Start the proactive work with default timeout. Based
* on the fragmentation score, this timeout is updated.
*/
timeout = default_timeout;
if (should_proactive_compact_node(pgdat)) {
unsigned int prev_score, score;
prev_score = fragmentation_score_node(pgdat);
proactive_compact_node(pgdat);
score = fragmentation_score_node(pgdat);
/*
* Defer proactive compaction if the fragmentation
* score did not go down i.e. no progress made.
*/
if (unlikely(score >= prev_score))
timeout =
default_timeout << COMPACT_MAX_DEFER_SHIFT;
}
if (unlikely(pgdat->proactive_compact_trigger))
pgdat->proactive_compact_trigger = false;
-
--[[linux-5.15/should_proactive_compact_node()]]
--[[linux-5.15/fragmentation_score_node()]]
--[[linux-5.15/proactive_compact_node()]]
--[[linux-5.15/unlikely()]]
}
return 0;
}
*コメント [#cbc2437f]
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