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authorLinus Torvalds <torvalds@linux-foundation.org>2020-12-19 11:39:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-19 11:39:50 -0800
commit1db98bcf56b1126428d59e71b815c310f73e44ab (patch)
tree086bf1626c161872805a6ba10b1f944646bdb4db /include
parent3644e2d2dda78e21edd8f5415b6d7ab03f5f54f3 (diff)
parent01ab1ede9190b9fafa88b1c97129c034fa9aa437 (diff)
Merge branch 'akpm' (patches from Andrew)
Merge still more updates from Andrew Morton: "18 patches. Subsystems affected by this patch series: mm (memcg and cleanups) and epoll" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm/Kconfig: fix spelling mistake "whats" -> "what's" selftests/filesystems: expand epoll with epoll_pwait2 epoll: wire up syscall epoll_pwait2 epoll: add syscall epoll_pwait2 epoll: convert internal api to timespec64 epoll: eliminate unnecessary lock for zero timeout epoll: replace gotos with a proper loop epoll: pull all code between fetch_events and send_event into the loop epoll: simplify and optimize busy loop logic epoll: move eavail next to the list_empty_careful check epoll: pull fatal signal checks into ep_send_events() epoll: simplify signal handling epoll: check for events when removing a timed out thread from the wait queue mm/memcontrol:rewrite mem_cgroup_page_lruvec() mm, kvm: account kvm_vcpu_mmap to kmemcg mm/memcg: remove unused definitions mm/memcg: warning on !memcg after readahead page charged mm/memcg: bail early from swap accounting if memcg disabled
Diffstat (limited to 'include')
-rw-r--r--include/linux/compat.h6
-rw-r--r--include/linux/memcontrol.h137
-rw-r--r--include/linux/mmdebug.h13
-rw-r--r--include/linux/syscalls.h5
-rw-r--r--include/uapi/asm-generic/unistd.h4
5 files changed, 44 insertions, 121 deletions
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 400c0941c8af..6e65be753603 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -537,6 +537,12 @@ asmlinkage long compat_sys_epoll_pwait(int epfd,
int maxevents, int timeout,
const compat_sigset_t __user *sigmask,
compat_size_t sigsetsize);
+asmlinkage long compat_sys_epoll_pwait2(int epfd,
+ struct epoll_event __user *events,
+ int maxevents,
+ const struct __kernel_timespec __user *timeout,
+ const compat_sigset_t __user *sigmask,
+ compat_size_t sigsetsize);
/* fs/fcntl.c */
asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 08ed57e02b73..d827bd7f3bfe 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -620,9 +620,10 @@ mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
/**
* mem_cgroup_lruvec - get the lru list vector for a memcg & node
* @memcg: memcg of the wanted lruvec
+ * @pgdat: pglist_data
*
* Returns the lru list vector holding pages for a given @memcg &
- * @node combination. This can be the node lruvec, if the memory
+ * @pgdat combination. This can be the node lruvec, if the memory
* controller is disabled.
*/
static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
@@ -652,7 +653,21 @@ out:
return lruvec;
}
-struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
+/**
+ * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
+ * @page: the page
+ * @pgdat: pgdat of the page
+ *
+ * This function relies on page->mem_cgroup being stable.
+ */
+static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
+ struct pglist_data *pgdat)
+{
+ struct mem_cgroup *memcg = page_memcg(page);
+
+ VM_WARN_ON_ONCE_PAGE(!memcg, page);
+ return mem_cgroup_lruvec(memcg, pgdat);
+}
static inline bool lruvec_holds_page_lru_lock(struct page *page,
struct lruvec *lruvec)
@@ -913,41 +928,6 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
local_irq_restore(flags);
}
-/**
- * mod_memcg_page_state - update page state statistics
- * @page: the page
- * @idx: page state item to account
- * @val: number of pages (positive or negative)
- *
- * The @page must be locked or the caller must use lock_page_memcg()
- * to prevent double accounting when the page is concurrently being
- * moved to another memcg:
- *
- * lock_page(page) or lock_page_memcg(page)
- * if (TestClearPageState(page))
- * mod_memcg_page_state(page, state, -1);
- * unlock_page(page) or unlock_page_memcg(page)
- *
- * Kernel pages are an exception to this, since they'll never move.
- */
-static inline void __mod_memcg_page_state(struct page *page,
- int idx, int val)
-{
- struct mem_cgroup *memcg = page_memcg(page);
-
- if (memcg)
- __mod_memcg_state(memcg, idx, val);
-}
-
-static inline void mod_memcg_page_state(struct page *page,
- int idx, int val)
-{
- struct mem_cgroup *memcg = page_memcg(page);
-
- if (memcg)
- mod_memcg_state(memcg, idx, val);
-}
-
static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
enum node_stat_item idx)
{
@@ -1395,18 +1375,6 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
{
}
-static inline void __mod_memcg_page_state(struct page *page,
- int idx,
- int nr)
-{
-}
-
-static inline void mod_memcg_page_state(struct page *page,
- int idx,
- int nr)
-{
-}
-
static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
enum node_stat_item idx)
{
@@ -1479,34 +1447,6 @@ static inline void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
}
#endif /* CONFIG_MEMCG */
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void __inc_memcg_state(struct mem_cgroup *memcg,
- int idx)
-{
- __mod_memcg_state(memcg, idx, 1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void __dec_memcg_state(struct mem_cgroup *memcg,
- int idx)
-{
- __mod_memcg_state(memcg, idx, -1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void __inc_memcg_page_state(struct page *page,
- int idx)
-{
- __mod_memcg_page_state(page, idx, 1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void __dec_memcg_page_state(struct page *page,
- int idx)
-{
- __mod_memcg_page_state(page, idx, -1);
-}
-
static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
{
__mod_lruvec_kmem_state(p, idx, 1);
@@ -1517,34 +1457,6 @@ static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx)
__mod_lruvec_kmem_state(p, idx, -1);
}
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void inc_memcg_state(struct mem_cgroup *memcg,
- int idx)
-{
- mod_memcg_state(memcg, idx, 1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void dec_memcg_state(struct mem_cgroup *memcg,
- int idx)
-{
- mod_memcg_state(memcg, idx, -1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void inc_memcg_page_state(struct page *page,
- int idx)
-{
- mod_memcg_page_state(page, idx, 1);
-}
-
-/* idx can be of type enum memcg_stat_item or node_stat_item */
-static inline void dec_memcg_page_state(struct page *page,
- int idx)
-{
- mod_memcg_page_state(page, idx, -1);
-}
-
static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
{
struct mem_cgroup *memcg;
@@ -1733,21 +1645,6 @@ static inline void memcg_kmem_uncharge_page(struct page *page, int order)
__memcg_kmem_uncharge_page(page, order);
}
-static inline int memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
- unsigned int nr_pages)
-{
- if (memcg_kmem_enabled())
- return __memcg_kmem_charge(memcg, gfp, nr_pages);
- return 0;
-}
-
-static inline void memcg_kmem_uncharge(struct mem_cgroup *memcg,
- unsigned int nr_pages)
-{
- if (memcg_kmem_enabled())
- __memcg_kmem_uncharge(memcg, nr_pages);
-}
-
/*
* A helper for accessing memcg's kmem_id, used for getting
* corresponding LRU lists.
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 2ad72d2c8cc5..5d0767cb424a 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -37,6 +37,18 @@ void dump_mm(const struct mm_struct *mm);
BUG(); \
} \
} while (0)
+#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \
+ static bool __section(".data.once") __warned; \
+ int __ret_warn_once = !!(cond); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
+ __warned = true; \
+ WARN_ON(1); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#define VM_WARN_ON(cond) (void)WARN_ON(cond)
#define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
#define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
@@ -48,6 +60,7 @@ void dump_mm(const struct mm_struct *mm);
#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
+#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
#endif
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index df0c3c74609e..f3929aff39cf 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -362,6 +362,11 @@ asmlinkage long sys_epoll_pwait(int epfd, struct epoll_event __user *events,
int maxevents, int timeout,
const sigset_t __user *sigmask,
size_t sigsetsize);
+asmlinkage long sys_epoll_pwait2(int epfd, struct epoll_event __user *events,
+ int maxevents,
+ const struct __kernel_timespec __user *timeout,
+ const sigset_t __user *sigmask,
+ size_t sigsetsize);
/* fs/fcntl.c */
asmlinkage long sys_dup(unsigned int fildes);
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index fc48c64700eb..728752917785 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -859,9 +859,11 @@ __SYSCALL(__NR_pidfd_getfd, sys_pidfd_getfd)
__SYSCALL(__NR_faccessat2, sys_faccessat2)
#define __NR_process_madvise 440
__SYSCALL(__NR_process_madvise, sys_process_madvise)
+#define __NR_epoll_pwait2 441
+__SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2)
#undef __NR_syscalls
-#define __NR_syscalls 441
+#define __NR_syscalls 442
/*
* 32 bit systems traditionally used different