linux-5.15/kswapd()
をテンプレートにして作成
[
トップ
] [
新規
|
一覧
|
検索
|
最終更新
|
ヘルプ
|
ログイン
]
開始行:
*参照元 [#x082c713]
#backlinks
*説明 [#we98f8de]
-パス: [[linux-5.15/mm/vmscan.c]]
-kswapdのスレッドメイン関数
**引数 [#b835ab99]
-void *p
--メモリノード。pg_data_t型のポインタを渡す。
--[[linux-5.15/pg_data_t]]
**返り値 [#vacd6ec1]
-int
--常に0、基本的に終了しないので意味はない。
**参考 [#a9528d89]
*実装 [#e3b7008b]
/*
* The background pageout daemon, started as a kernel th...
* from the init process.
*
* This basically trickles out pages so that we have _so...
* free memory available even if there is no other activ...
* that frees anything up. This is needed for things lik...
* etc, where we otherwise might have all activity going...
* asynchronous contexts that cannot page things out.
*
* If there are applications that are active memory-allo...
* (most normal use), this basically shouldn't matter.
*/
static int kswapd(void *p)
{
unsigned int alloc_order, reclaim_order;
unsigned int highest_zoneidx = MAX_NR_ZONES - 1;
pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
const struct cpumask *cpumask = cpumask_of_node(pgdat->...
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
-
--[[linux-5.15/pg_data_t]]
--[[linux-5.15/task_struct]]
--[[linux-5.15/cpumask]]
--[[linux-5.15/cpumask_of_node()]]
--[[linux-5.15/cpumask_empty()]]
--[[linux-5.15/set_cpus_allowed_ptr()]]
/*
* Tell the memory management that we're a "memory allo...
* and that if we need more memory we should get access...
* regardless (see "__alloc_pages()"). "kswapd" should
* never get caught in the normal page freeing logic.
*
* (Kswapd normally doesn't need memory anyway, but som...
* you need a small amount of memory in order to be abl...
* page out something else, and this flag essentially p...
* us from recursively trying to free more memory as we...
* trying to free the first piece of memory in the firs...
*/
tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
set_freezable();
WRITE_ONCE(pgdat->kswapd_order, 0);
WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES);
-
--[[linux-5.15/set_freezable()]]
--[[linux-5.15/WRITE_ONCE()]]
for ( ; ; ) {
bool ret;
alloc_order = reclaim_order = READ_ONCE(pgdat->kswapd_...
highest_zoneidx = kswapd_highest_zoneidx(pgdat,
highest_zoneidx);
-
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
kswapd_try_sleep:
kswapd_try_to_sleep(pgdat, alloc_order, reclaim_order,
highest_zoneidx);
-
--[[linux-5.15/kswapd_try_to_sleep()]]
/* Read the new order and highest_zoneidx */
alloc_order = READ_ONCE(pgdat->kswapd_order);
highest_zoneidx = kswapd_highest_zoneidx(pgdat,
highest_zoneidx);
WRITE_ONCE(pgdat->kswapd_order, 0);
WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES);
ret = try_to_freeze();
if (kthread_should_stop())
break;
-
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
--[[linux-5.15/WRITE_ONCE()]]
--[[linux-5.15/try_to_freeze()]]
--[[linux-5.15/kthread_should_stop()]]
/*
* We can speed up thawing tasks if we don't call bala...
* after returning from the refrigerator
*/
if (ret)
continue;
/*
* Reclaim begins at the requested order but if a high...
* reclaim fails then kswapd falls back to reclaiming ...
* order-0. If that happens, kswapd will consider slee...
* for the order it finished reclaiming at (reclaim_or...
* but kcompactd is woken to compact for the original
* request (alloc_order).
*/
trace_mm_vmscan_kswapd_wake(pgdat->node_id, highest_zo...
alloc_order);
reclaim_order = balance_pgdat(pgdat, alloc_order,
highest_zoneidx);
if (reclaim_order < alloc_order)
goto kswapd_try_sleep;
}
-
--[[linux-5.15/trace_mm_vmscan_kswapd_wake()]]
--[[linux-5.15/balance_pgdat()]]
tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
return 0;
}
*コメント [#p37b6e43]
終了行:
*参照元 [#x082c713]
#backlinks
*説明 [#we98f8de]
-パス: [[linux-5.15/mm/vmscan.c]]
-kswapdのスレッドメイン関数
**引数 [#b835ab99]
-void *p
--メモリノード。pg_data_t型のポインタを渡す。
--[[linux-5.15/pg_data_t]]
**返り値 [#vacd6ec1]
-int
--常に0、基本的に終了しないので意味はない。
**参考 [#a9528d89]
*実装 [#e3b7008b]
/*
* The background pageout daemon, started as a kernel th...
* from the init process.
*
* This basically trickles out pages so that we have _so...
* free memory available even if there is no other activ...
* that frees anything up. This is needed for things lik...
* etc, where we otherwise might have all activity going...
* asynchronous contexts that cannot page things out.
*
* If there are applications that are active memory-allo...
* (most normal use), this basically shouldn't matter.
*/
static int kswapd(void *p)
{
unsigned int alloc_order, reclaim_order;
unsigned int highest_zoneidx = MAX_NR_ZONES - 1;
pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
const struct cpumask *cpumask = cpumask_of_node(pgdat->...
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
-
--[[linux-5.15/pg_data_t]]
--[[linux-5.15/task_struct]]
--[[linux-5.15/cpumask]]
--[[linux-5.15/cpumask_of_node()]]
--[[linux-5.15/cpumask_empty()]]
--[[linux-5.15/set_cpus_allowed_ptr()]]
/*
* Tell the memory management that we're a "memory allo...
* and that if we need more memory we should get access...
* regardless (see "__alloc_pages()"). "kswapd" should
* never get caught in the normal page freeing logic.
*
* (Kswapd normally doesn't need memory anyway, but som...
* you need a small amount of memory in order to be abl...
* page out something else, and this flag essentially p...
* us from recursively trying to free more memory as we...
* trying to free the first piece of memory in the firs...
*/
tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
set_freezable();
WRITE_ONCE(pgdat->kswapd_order, 0);
WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES);
-
--[[linux-5.15/set_freezable()]]
--[[linux-5.15/WRITE_ONCE()]]
for ( ; ; ) {
bool ret;
alloc_order = reclaim_order = READ_ONCE(pgdat->kswapd_...
highest_zoneidx = kswapd_highest_zoneidx(pgdat,
highest_zoneidx);
-
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
kswapd_try_sleep:
kswapd_try_to_sleep(pgdat, alloc_order, reclaim_order,
highest_zoneidx);
-
--[[linux-5.15/kswapd_try_to_sleep()]]
/* Read the new order and highest_zoneidx */
alloc_order = READ_ONCE(pgdat->kswapd_order);
highest_zoneidx = kswapd_highest_zoneidx(pgdat,
highest_zoneidx);
WRITE_ONCE(pgdat->kswapd_order, 0);
WRITE_ONCE(pgdat->kswapd_highest_zoneidx, MAX_NR_ZONES);
ret = try_to_freeze();
if (kthread_should_stop())
break;
-
--[[linux-5.15/READ_ONCE()]]
--[[linux-5.15/kswapd_highest_zoneidx()]]
--[[linux-5.15/WRITE_ONCE()]]
--[[linux-5.15/try_to_freeze()]]
--[[linux-5.15/kthread_should_stop()]]
/*
* We can speed up thawing tasks if we don't call bala...
* after returning from the refrigerator
*/
if (ret)
continue;
/*
* Reclaim begins at the requested order but if a high...
* reclaim fails then kswapd falls back to reclaiming ...
* order-0. If that happens, kswapd will consider slee...
* for the order it finished reclaiming at (reclaim_or...
* but kcompactd is woken to compact for the original
* request (alloc_order).
*/
trace_mm_vmscan_kswapd_wake(pgdat->node_id, highest_zo...
alloc_order);
reclaim_order = balance_pgdat(pgdat, alloc_order,
highest_zoneidx);
if (reclaim_order < alloc_order)
goto kswapd_try_sleep;
}
-
--[[linux-5.15/trace_mm_vmscan_kswapd_wake()]]
--[[linux-5.15/balance_pgdat()]]
tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
return 0;
}
*コメント [#p37b6e43]
ページ名:
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
