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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0085-mm-memcontrol-Replace-local_irq_disable-with-local-l.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/debian/patches-rt/0085-mm-memcontrol-Replace-local_irq_disable-with-local-l.patch b/debian/patches-rt/0085-mm-memcontrol-Replace-local_irq_disable-with-local-l.patch new file mode 100644 index 000000000..8da70c668 --- /dev/null +++ b/debian/patches-rt/0085-mm-memcontrol-Replace-local_irq_disable-with-local-l.patch @@ -0,0 +1,124 @@ +From d5d11c92081bb9edd9eb11cd752a325f8822a0a5 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 28 Jan 2015 17:14:16 +0100 +Subject: [PATCH 085/347] mm/memcontrol: Replace local_irq_disable with local + locks +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +There are a few local_irq_disable() which then take sleeping locks. This +patch converts them local locks. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + mm/memcontrol.c | 24 ++++++++++++++++-------- + 1 file changed, 16 insertions(+), 8 deletions(-) + +diff --git a/mm/memcontrol.c b/mm/memcontrol.c +index 281d74f86892..239fec6eac9f 100644 +--- a/mm/memcontrol.c ++++ b/mm/memcontrol.c +@@ -69,6 +69,7 @@ + #include <net/sock.h> + #include <net/ip.h> + #include "slab.h" ++#include <linux/locallock.h> + + #include <linux/uaccess.h> + +@@ -94,6 +95,8 @@ int do_swap_account __read_mostly; + #define do_swap_account 0 + #endif + ++static DEFINE_LOCAL_IRQ_LOCK(event_lock); ++ + /* Whether legacy memory+swap accounting is active */ + static bool do_memsw_account(void) + { +@@ -4933,12 +4936,12 @@ static int mem_cgroup_move_account(struct page *page, + + ret = 0; + +- local_irq_disable(); ++ local_lock_irq(event_lock); + mem_cgroup_charge_statistics(to, page, compound, nr_pages); + memcg_check_events(to, page); + mem_cgroup_charge_statistics(from, page, compound, -nr_pages); + memcg_check_events(from, page); +- local_irq_enable(); ++ local_unlock_irq(event_lock); + out_unlock: + unlock_page(page); + out: +@@ -6057,10 +6060,10 @@ void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, + + commit_charge(page, memcg, lrucare); + +- local_irq_disable(); ++ local_lock_irq(event_lock); + mem_cgroup_charge_statistics(memcg, page, compound, nr_pages); + memcg_check_events(memcg, page); +- local_irq_enable(); ++ local_unlock_irq(event_lock); + + if (do_memsw_account() && PageSwapCache(page)) { + swp_entry_t entry = { .val = page_private(page) }; +@@ -6129,7 +6132,7 @@ static void uncharge_batch(const struct uncharge_gather *ug) + memcg_oom_recover(ug->memcg); + } + +- local_irq_save(flags); ++ local_lock_irqsave(event_lock, flags); + __mod_memcg_state(ug->memcg, MEMCG_RSS, -ug->nr_anon); + __mod_memcg_state(ug->memcg, MEMCG_CACHE, -ug->nr_file); + __mod_memcg_state(ug->memcg, MEMCG_RSS_HUGE, -ug->nr_huge); +@@ -6137,7 +6140,7 @@ static void uncharge_batch(const struct uncharge_gather *ug) + __count_memcg_events(ug->memcg, PGPGOUT, ug->pgpgout); + __this_cpu_add(ug->memcg->stat_cpu->nr_page_events, nr_pages); + memcg_check_events(ug->memcg, ug->dummy_page); +- local_irq_restore(flags); ++ local_unlock_irqrestore(event_lock, flags); + + if (!mem_cgroup_is_root(ug->memcg)) + css_put_many(&ug->memcg->css, nr_pages); +@@ -6300,10 +6303,10 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage) + + commit_charge(newpage, memcg, false); + +- local_irq_save(flags); ++ local_lock_irqsave(event_lock, flags); + mem_cgroup_charge_statistics(memcg, newpage, compound, nr_pages); + memcg_check_events(memcg, newpage); +- local_irq_restore(flags); ++ local_unlock_irqrestore(event_lock, flags); + } + + DEFINE_STATIC_KEY_FALSE(memcg_sockets_enabled_key); +@@ -6485,6 +6488,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) + struct mem_cgroup *memcg, *swap_memcg; + unsigned int nr_entries; + unsigned short oldid; ++ unsigned long flags; + + VM_BUG_ON_PAGE(PageLRU(page), page); + VM_BUG_ON_PAGE(page_count(page), page); +@@ -6530,13 +6534,17 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) + * important here to have the interrupts disabled because it is the + * only synchronisation we have for updating the per-CPU variables. + */ ++ local_lock_irqsave(event_lock, flags); ++#ifndef CONFIG_PREEMPT_RT_BASE + VM_BUG_ON(!irqs_disabled()); ++#endif + mem_cgroup_charge_statistics(memcg, page, PageTransHuge(page), + -nr_entries); + memcg_check_events(memcg, page); + + if (!mem_cgroup_is_root(memcg)) + css_put_many(&memcg->css, nr_entries); ++ local_unlock_irqrestore(event_lock, flags); + } + + /** +-- +2.36.1 + |