linux-5.15/kswapd_try_to_sleep()
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開始行:
*参照元 [#vd9b0e58]
#backlinks
*説明 [#h80606b8]
-パス: [[linux-5.15/mm/vmscan.c]]
-FIXME: これは何？
--説明
**引数 [#s7be8084]
-pg_data_t *pgdat
--
--[[linux-5.15/pg_data_t]]
-int alloc_order
--
-int reclaim_order
--
-unsigned int highest_zoneidx
--メモリを確保する最大のゾーンインデックス値。この値以下...
**返り値 [#h35fa71c]
-なし
**参考 [#q809dd11]
*実装 [#v851d86e]
static void kswapd_try_to_sleep(pg_data_t *pgdat, int al...
unsigned int highest_zoneidx)
{
long remaining = 0;
DEFINE_WAIT(wait);
if (freezing(current) || kthread_should_stop())
return;
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERR...
-
--[[linux-5.15/DEFINE_WAIT()]]
--[[linux-5.15/freezing()]]
--[[linux-5.15/kthread_should_stop()]]
--[[linux-5.15/prepare_to_wait()]]
/*
* Try to sleep for a short interval. Note that kcompac...
* woken if it is possible to sleep for a short interva...
* deliberate on the assumption that if reclaim cannot ...
* eligible zone balanced that it's also unlikely that ...
* succeed.
*/
if (prepare_kswapd_sleep(pgdat, reclaim_order, highest_...
-
--[[linux-5.15/prepare_kswapd_sleep()]]
/*
* Compaction records what page blocks it recently fai...
* isolate pages from and skips them in the future sca...
* When kswapd is going to sleep, it is reasonable to ...
* that pages and compaction may succeed so reset the ...
*/
reset_isolation_suitable(pgdat);
-
--[[linux-5.15/reset_isolation_suitable()]]
/*
* We have freed the memory, now we should compact it ...
* allocation of the requested order possible.
*/
wakeup_kcompactd(pgdat, alloc_order, highest_zoneidx);
-
--[[linux-5.15/wakeup_kcompactd()]]
remaining = schedule_timeout(HZ/10);
-
--[[linux-5.15/schedule_timeout()]]
/*
* If woken prematurely then reset kswapd_highest_zone...
* order. The values will either be from a wakeup requ...
* the previous request that slept prematurely.
*/
if (remaining) {
WRITE_ONCE(pgdat->kswapd_highest_zoneidx,
kswapd_highest_zoneidx(pgdat,
highest_zoneidx));
if (READ_ONCE(pgdat->kswapd_order) < reclaim_order)
WRITE_ONCE(pgdat->kswapd_order, reclaim_order);
}
finish_wait(&pgdat->kswapd_wait, &wait);
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTER...
-
--[[linux-5.15/WRITE_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/finish_wait()]]
--[[linux-5.15/prepare_to_wait()]]
}
/*
* After a short sleep, check if it was a premature sle...
* go fully to sleep until explicitly woken up.
*/
if (!remaining &&
prepare_kswapd_sleep(pgdat, reclaim_order, highest_...
trace_mm_vmscan_kswapd_sleep(pgdat->node_id);
-
--[[linux-5.15/prepare_kswapd_sleep()]]
--[[linux-5.15/trace_mm_vmscan_kswapd_sleep()]]
/*
* vmstat counters are not perfectly accurate and the ...
* value for counters such as NR_FREE_PAGES can deviat...
* true value by nr_online_cpus * threshold. To avoid ...
* watermarks being breached while under pressure, we ...
* per-cpu vmstat threshold while kswapd is awake and ...
* them before going back to sleep.
*/
set_pgdat_percpu_threshold(pgdat, calculate_normal_thr...
if (!kthread_should_stop())
schedule();
set_pgdat_percpu_threshold(pgdat, calculate_pressure_t...
-
--[[linux-5.15/set_pgdat_percpu_threshold()]]
--[[linux-5.15/kthread_should_stop()]]
} else {
if (remaining)
count_vm_event(KSWAPD_LOW_WMARK_HIT_QUICKLY);
else
count_vm_event(KSWAPD_HIGH_WMARK_HIT_QUICKLY);
}
finish_wait(&pgdat->kswapd_wait, &wait);
}
-
--[[linux-5.15/count_vm_event()]]
--[[linux-5.15/finish_wait()]]
*コメント [#y7113d60]
終了行:
*参照元 [#vd9b0e58]
#backlinks
*説明 [#h80606b8]
-パス: [[linux-5.15/mm/vmscan.c]]
-FIXME: これは何？
--説明
**引数 [#s7be8084]
-pg_data_t *pgdat
--
--[[linux-5.15/pg_data_t]]
-int alloc_order
--
-int reclaim_order
--
-unsigned int highest_zoneidx
--メモリを確保する最大のゾーンインデックス値。この値以下...
**返り値 [#h35fa71c]
-なし
**参考 [#q809dd11]
*実装 [#v851d86e]
static void kswapd_try_to_sleep(pg_data_t *pgdat, int al...
unsigned int highest_zoneidx)
{
long remaining = 0;
DEFINE_WAIT(wait);
if (freezing(current) || kthread_should_stop())
return;
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERR...
-
--[[linux-5.15/DEFINE_WAIT()]]
--[[linux-5.15/freezing()]]
--[[linux-5.15/kthread_should_stop()]]
--[[linux-5.15/prepare_to_wait()]]
/*
* Try to sleep for a short interval. Note that kcompac...
* woken if it is possible to sleep for a short interva...
* deliberate on the assumption that if reclaim cannot ...
* eligible zone balanced that it's also unlikely that ...
* succeed.
*/
if (prepare_kswapd_sleep(pgdat, reclaim_order, highest_...
-
--[[linux-5.15/prepare_kswapd_sleep()]]
/*
* Compaction records what page blocks it recently fai...
* isolate pages from and skips them in the future sca...
* When kswapd is going to sleep, it is reasonable to ...
* that pages and compaction may succeed so reset the ...
*/
reset_isolation_suitable(pgdat);
-
--[[linux-5.15/reset_isolation_suitable()]]
/*
* We have freed the memory, now we should compact it ...
* allocation of the requested order possible.
*/
wakeup_kcompactd(pgdat, alloc_order, highest_zoneidx);
-
--[[linux-5.15/wakeup_kcompactd()]]
remaining = schedule_timeout(HZ/10);
-
--[[linux-5.15/schedule_timeout()]]
/*
* If woken prematurely then reset kswapd_highest_zone...
* order. The values will either be from a wakeup requ...
* the previous request that slept prematurely.
*/
if (remaining) {
WRITE_ONCE(pgdat->kswapd_highest_zoneidx,
kswapd_highest_zoneidx(pgdat,
highest_zoneidx));
if (READ_ONCE(pgdat->kswapd_order) < reclaim_order)
WRITE_ONCE(pgdat->kswapd_order, reclaim_order);
}
finish_wait(&pgdat->kswapd_wait, &wait);
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTER...
-
--[[linux-5.15/WRITE_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/finish_wait()]]
--[[linux-5.15/prepare_to_wait()]]
}
/*
* After a short sleep, check if it was a premature sle...
* go fully to sleep until explicitly woken up.
*/
if (!remaining &&
prepare_kswapd_sleep(pgdat, reclaim_order, highest_...
trace_mm_vmscan_kswapd_sleep(pgdat->node_id);
-
--[[linux-5.15/prepare_kswapd_sleep()]]
--[[linux-5.15/trace_mm_vmscan_kswapd_sleep()]]
/*
* vmstat counters are not perfectly accurate and the ...
* value for counters such as NR_FREE_PAGES can deviat...
* true value by nr_online_cpus * threshold. To avoid ...
* watermarks being breached while under pressure, we ...
* per-cpu vmstat threshold while kswapd is awake and ...
* them before going back to sleep.
*/
set_pgdat_percpu_threshold(pgdat, calculate_normal_thr...
if (!kthread_should_stop())
schedule();
set_pgdat_percpu_threshold(pgdat, calculate_pressure_t...
-
--[[linux-5.15/set_pgdat_percpu_threshold()]]
--[[linux-5.15/kthread_should_stop()]]
} else {
if (remaining)
count_vm_event(KSWAPD_LOW_WMARK_HIT_QUICKLY);
else
count_vm_event(KSWAPD_HIGH_WMARK_HIT_QUICKLY);
}
finish_wait(&pgdat->kswapd_wait, &wait);
}
-
--[[linux-5.15/count_vm_event()]]
--[[linux-5.15/finish_wait()]]
*コメント [#y7113d60]
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