linux-5.15/shrink_active_list()
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*参照元 [#t2c8d114]
#backlinks
*説明 [#icb47ab4]
-パス: [[linux-5.15/mm/vmscan.c]]
-FIXME: これは何？
--説明
**引数 [#wc0275d0]
--unsigned long nr_to_scan
--
-struct lruvec *lruvec
--
--[[linux-5.15/lruvec]]
-struct scan_control *sc
--
--[[linux-5.15/scan_control]]
-enum lru_list lru
--
--[[linux-5.15/lru_list]]
**返り値 [#m721ffdf]
-なし
**参考 [#j42f1a41]
*実装 [#bb73a88f]
/*
* shrink_active_list() moves pages from the active LRU ...
*
* We move them the other way if the page is referenced ...
* processes.
*
* If the pages are mostly unmapped, the processing is f...
* appropriate to hold lru_lock across the whole operati...
* the pages are mapped, the processing is slow (page_re...
* we should drop lru_lock around each page. It's impos...
* this, so instead we remove the pages from the LRU whi...
* It is safe to rely on PG_active against the non-LRU p...
* nobody will play with that bit on a non-LRU page.
*
* The downside is that we have to touch page->_refcount...
* But we had to alter page->flags anyway.
*/
static void shrink_active_list(unsigned long nr_to_scan,
struct lruvec *lruvec,
struct scan_control *sc,
enum lru_list lru)
{
unsigned long nr_taken;
unsigned long nr_scanned;
unsigned long vm_flags;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
struct page *page;
unsigned nr_deactivate, nr_activate;
unsigned nr_rotated = 0;
int file = is_file_lru(lru);
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
lru_add_drain();
spin_lock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/LIST_HEAD()]]
--[[linux-5.15/page]]
--[[linux-5.15/is_file_lru()]]
--[[linux-5.15/pglist_data]]
--[[linux-5.15/lruvec_pgdat()]]
--[[linux-5.15/lru_add_drain()]]
--[[linux-5.15/spin_lock_irq()]]
nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
&nr_scanned, sc, lru);
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, n...
-
--[[linux-5.15/isolate_lru_pages()]]
--[[linux-5.15/__mod_node_page_state()]]
if (!cgroup_reclaim(sc))
__count_vm_events(PGREFILL, nr_scanned);
__count_memcg_events(lruvec_memcg(lruvec), PGREFILL, nr...
spin_unlock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/cgroup_reclaim()]]
--[[linux-5.15/__count_vm_events()]]
--[[linux-5.15/lruvec_memcg()]]
--[[linux-5.15/spin_unlock_irq()]]
while (!list_empty(&l_hold)) {
cond_resched();
page = lru_to_page(&l_hold);
list_del(&page->lru);
-
--[[linux-5.15/list_empty()]]
--[[linux-5.15/cond_resched()]]
--[[linux-5.15/lru_to_page()]]
--[[linux-5.15/list_del()]]
if (unlikely(!page_evictable(page))) {
putback_lru_page(page);
continue;
}
-
--[[linux-5.15/page_evictable()]]
--[[linux-5.15/putback_lru_page()]]
if (unlikely(buffer_heads_over_limit)) {
if (page_has_private(page) && trylock_page(page)) {
if (page_has_private(page))
try_to_release_page(page, 0);
unlock_page(page);
}
}
-
--[[linux-5.15/page_has_private()]]
--[[linux-5.15/trylock_page()]]
--[[linux-5.15/try_to_release_page()]]
--[[linux-5.15/unlock_page()]]
if (page_referenced(page, 0, sc->target_mem_cgroup,
&vm_flags)) {
/*
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So
* that executable code get better chances to stay in
* memory under moderate memory pressure. Anon pages
* are not likely to be evicted by use-once streaming
* IO, plus JVM can create lots of anon VM_EXEC pages,
* so we ignore them here.
*/
if ((vm_flags & VM_EXEC) && page_is_file_lru(page)) {
nr_rotated += thp_nr_pages(page);
list_add(&page->lru, &l_active);
continue;
}
}
-
--[[linux-5.15/page_referenced()]]
--[[linux-5.15/page_is_file_lru()]]
--[[linux-5.15/thp_nr_pages()]]
--[[linux-5.15/list_add()]]
ClearPageActive(page); /* we are de-activating */
SetPageWorkingset(page);
list_add(&page->lru, &l_inactive);
}
-
--[[linux-5.15/ClearPageActive()]]
--[[linux-5.15/SetPageWorkingset()]]
--[[linux-5.15/list_add()]]
/*
* Move pages back to the lru list.
*/
spin_lock_irq(&lruvec->lru_lock);
nr_activate = move_pages_to_lru(lruvec, &l_active);
nr_deactivate = move_pages_to_lru(lruvec, &l_inactive);
/* Keep all free pages in l_active list */
list_splice(&l_inactive, &l_active);
-
--[[linux-5.15/spin_lock_irq()]]
--[[linux-5.15/move_pages_to_lru()]]
--[[linux-5.15/list_splice()]]
__count_vm_events(PGDEACTIVATE, nr_deactivate);
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE...
-
--[[linux-5.15/__count_vm_events()]]
--[[linux-5.15/__count_memcg_events()]]
--[[linux-5.15/lruvec_memcg()]]
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -...
spin_unlock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/__mod_node_page_state()]]
--[[linux-5.15/spin_unlock_irq()]]
mem_cgroup_uncharge_list(&l_active);
free_unref_page_list(&l_active);
trace_mm_vmscan_lru_shrink_active(pgdat->node_id, nr_ta...
nr_deactivate, nr_rotated, sc->priority, file);
}
-
--[[linux-5.15/mem_cgroup_uncharge_list()]]
--[[linux-5.15/free_unref_page_list()]]
--[[linux-5.15/trace_mm_vmscan_lru_shrink_active()]]
*コメント [#rd6ee5f5]
終了行:
*参照元 [#t2c8d114]
#backlinks
*説明 [#icb47ab4]
-パス: [[linux-5.15/mm/vmscan.c]]
-FIXME: これは何？
--説明
**引数 [#wc0275d0]
--unsigned long nr_to_scan
--
-struct lruvec *lruvec
--
--[[linux-5.15/lruvec]]
-struct scan_control *sc
--
--[[linux-5.15/scan_control]]
-enum lru_list lru
--
--[[linux-5.15/lru_list]]
**返り値 [#m721ffdf]
-なし
**参考 [#j42f1a41]
*実装 [#bb73a88f]
/*
* shrink_active_list() moves pages from the active LRU ...
*
* We move them the other way if the page is referenced ...
* processes.
*
* If the pages are mostly unmapped, the processing is f...
* appropriate to hold lru_lock across the whole operati...
* the pages are mapped, the processing is slow (page_re...
* we should drop lru_lock around each page. It's impos...
* this, so instead we remove the pages from the LRU whi...
* It is safe to rely on PG_active against the non-LRU p...
* nobody will play with that bit on a non-LRU page.
*
* The downside is that we have to touch page->_refcount...
* But we had to alter page->flags anyway.
*/
static void shrink_active_list(unsigned long nr_to_scan,
struct lruvec *lruvec,
struct scan_control *sc,
enum lru_list lru)
{
unsigned long nr_taken;
unsigned long nr_scanned;
unsigned long vm_flags;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
struct page *page;
unsigned nr_deactivate, nr_activate;
unsigned nr_rotated = 0;
int file = is_file_lru(lru);
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
lru_add_drain();
spin_lock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/LIST_HEAD()]]
--[[linux-5.15/page]]
--[[linux-5.15/is_file_lru()]]
--[[linux-5.15/pglist_data]]
--[[linux-5.15/lruvec_pgdat()]]
--[[linux-5.15/lru_add_drain()]]
--[[linux-5.15/spin_lock_irq()]]
nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
&nr_scanned, sc, lru);
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, n...
-
--[[linux-5.15/isolate_lru_pages()]]
--[[linux-5.15/__mod_node_page_state()]]
if (!cgroup_reclaim(sc))
__count_vm_events(PGREFILL, nr_scanned);
__count_memcg_events(lruvec_memcg(lruvec), PGREFILL, nr...
spin_unlock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/cgroup_reclaim()]]
--[[linux-5.15/__count_vm_events()]]
--[[linux-5.15/lruvec_memcg()]]
--[[linux-5.15/spin_unlock_irq()]]
while (!list_empty(&l_hold)) {
cond_resched();
page = lru_to_page(&l_hold);
list_del(&page->lru);
-
--[[linux-5.15/list_empty()]]
--[[linux-5.15/cond_resched()]]
--[[linux-5.15/lru_to_page()]]
--[[linux-5.15/list_del()]]
if (unlikely(!page_evictable(page))) {
putback_lru_page(page);
continue;
}
-
--[[linux-5.15/page_evictable()]]
--[[linux-5.15/putback_lru_page()]]
if (unlikely(buffer_heads_over_limit)) {
if (page_has_private(page) && trylock_page(page)) {
if (page_has_private(page))
try_to_release_page(page, 0);
unlock_page(page);
}
}
-
--[[linux-5.15/page_has_private()]]
--[[linux-5.15/trylock_page()]]
--[[linux-5.15/try_to_release_page()]]
--[[linux-5.15/unlock_page()]]
if (page_referenced(page, 0, sc->target_mem_cgroup,
&vm_flags)) {
/*
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So
* that executable code get better chances to stay in
* memory under moderate memory pressure. Anon pages
* are not likely to be evicted by use-once streaming
* IO, plus JVM can create lots of anon VM_EXEC pages,
* so we ignore them here.
*/
if ((vm_flags & VM_EXEC) && page_is_file_lru(page)) {
nr_rotated += thp_nr_pages(page);
list_add(&page->lru, &l_active);
continue;
}
}
-
--[[linux-5.15/page_referenced()]]
--[[linux-5.15/page_is_file_lru()]]
--[[linux-5.15/thp_nr_pages()]]
--[[linux-5.15/list_add()]]
ClearPageActive(page); /* we are de-activating */
SetPageWorkingset(page);
list_add(&page->lru, &l_inactive);
}
-
--[[linux-5.15/ClearPageActive()]]
--[[linux-5.15/SetPageWorkingset()]]
--[[linux-5.15/list_add()]]
/*
* Move pages back to the lru list.
*/
spin_lock_irq(&lruvec->lru_lock);
nr_activate = move_pages_to_lru(lruvec, &l_active);
nr_deactivate = move_pages_to_lru(lruvec, &l_inactive);
/* Keep all free pages in l_active list */
list_splice(&l_inactive, &l_active);
-
--[[linux-5.15/spin_lock_irq()]]
--[[linux-5.15/move_pages_to_lru()]]
--[[linux-5.15/list_splice()]]
__count_vm_events(PGDEACTIVATE, nr_deactivate);
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE...
-
--[[linux-5.15/__count_vm_events()]]
--[[linux-5.15/__count_memcg_events()]]
--[[linux-5.15/lruvec_memcg()]]
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -...
spin_unlock_irq(&lruvec->lru_lock);
-
--[[linux-5.15/__mod_node_page_state()]]
--[[linux-5.15/spin_unlock_irq()]]
mem_cgroup_uncharge_list(&l_active);
free_unref_page_list(&l_active);
trace_mm_vmscan_lru_shrink_active(pgdat->node_id, nr_ta...
nr_deactivate, nr_rotated, sc->priority, file);
}
-
--[[linux-5.15/mem_cgroup_uncharge_list()]]
--[[linux-5.15/free_unref_page_list()]]
--[[linux-5.15/trace_mm_vmscan_lru_shrink_active()]]
*コメント [#rd6ee5f5]
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