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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-17 08:58:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-17 08:58:04 -0700
commit57a8ec387e1441ea5e1232bc0749fb99a8cba7e7 (patch)
treeb5fb03fc6bc5754de8b5b1f8b0e4f36d67c8315c /mm
parent0a8ad0ffa4d80a544f6cbff703bf6394339afcdf (diff)
parent43e11fa2d1d3b6e35629fa556eb7d571edba2010 (diff)
downloadlinux-57a8ec387e1441ea5e1232bc0749fb99a8cba7e7.tar.bz2
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: "VM: - z3fold fixes and enhancements by Henry Burns and Vitaly Wool - more accurate reclaimed slab caches calculations by Yafang Shao - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by Christoph Hellwig - !CONFIG_MMU fixes by Christoph Hellwig - new novmcoredd parameter to omit device dumps from vmcore, by Kairui Song - new test_meminit module for testing heap and pagealloc initialization, by Alexander Potapenko - ioremap improvements for huge mappings, by Anshuman Khandual - generalize kprobe page fault handling, by Anshuman Khandual - device-dax hotplug fixes and improvements, by Pavel Tatashin - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V - add pte_devmap() support for arm64, by Robin Murphy - unify locked_vm accounting with a helper, by Daniel Jordan - several misc fixes core/lib: - new typeof_member() macro including some users, by Alexey Dobriyan - make BIT() and GENMASK() available in asm, by Masahiro Yamada - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better code generation, by Alexey Dobriyan - rbtree code size optimizations, by Michel Lespinasse - convert struct pid count to refcount_t, by Joel Fernandes get_maintainer.pl: - add --no-moderated switch to skip moderated ML's, by Joe Perches misc: - ptrace PTRACE_GET_SYSCALL_INFO interface - coda updates - gdb scripts, various" [ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ] * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits) fs/select.c: use struct_size() in kmalloc() mm: add account_locked_vm utility function arm64: mm: implement pte_devmap support mm: introduce ARCH_HAS_PTE_DEVMAP mm: clean up is_device_*_page() definitions mm/mmap: move common defines to mman-common.h mm: move MAP_SYNC to asm-generic/mman-common.h device-dax: "Hotremove" persistent memory that is used like normal RAM mm/hotplug: make remove_memory() interface usable device-dax: fix memory and resource leak if hotplug fails include/linux/lz4.h: fix spelling and copy-paste errors in documentation ipc/mqueue.c: only perform resource calculation if user valid include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures scripts/gdb: add helpers to find and list devices scripts/gdb: add lx-genpd-summary command drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl kernel/pid.c: convert struct pid count to refcount_t drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining() select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR ...
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig5
-rw-r--r--mm/cma.c15
-rw-r--r--mm/gup.c2
-rw-r--r--mm/memcontrol.c22
-rw-r--r--mm/memory_hotplug.c64
-rw-r--r--mm/nommu.c4
-rw-r--r--mm/page_alloc.c4
-rw-r--r--mm/shmem.c4
-rw-r--r--mm/slab_common.c3
-rw-r--r--mm/util.c75
-rw-r--r--mm/vmscan.c44
-rw-r--r--mm/z3fold.c29
12 files changed, 206 insertions, 65 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 495d7368ced8..56cec636a1fc 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -649,8 +649,7 @@ config IDLE_PAGE_TRACKING
See Documentation/admin-guide/mm/idle_page_tracking.rst for
more details.
-# arch_add_memory() comprehends device memory
-config ARCH_HAS_ZONE_DEVICE
+config ARCH_HAS_PTE_DEVMAP
bool
config ZONE_DEVICE
@@ -658,7 +657,7 @@ config ZONE_DEVICE
depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE
depends on SPARSEMEM_VMEMMAP
- depends on ARCH_HAS_ZONE_DEVICE
+ depends on ARCH_HAS_PTE_DEVMAP
select XARRAY_MULTI
help
diff --git a/mm/cma.c b/mm/cma.c
index 3340ef34c154..7fe0b8356775 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -278,6 +278,12 @@ int __init cma_declare_contiguous(phys_addr_t base,
*/
alignment = max(alignment, (phys_addr_t)PAGE_SIZE <<
max_t(unsigned long, MAX_ORDER - 1, pageblock_order));
+ if (fixed && base & (alignment - 1)) {
+ ret = -EINVAL;
+ pr_err("Region at %pa must be aligned to %pa bytes\n",
+ &base, &alignment);
+ goto err;
+ }
base = ALIGN(base, alignment);
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);
@@ -308,6 +314,13 @@ int __init cma_declare_contiguous(phys_addr_t base,
if (limit == 0 || limit > memblock_end)
limit = memblock_end;
+ if (base + size > limit) {
+ ret = -EINVAL;
+ pr_err("Size (%pa) of region at %pa exceeds limit (%pa)\n",
+ &size, &base, &limit);
+ goto err;
+ }
+
/* Reserve memory */
if (fixed) {
if (memblock_is_region_reserved(base, size) ||
@@ -494,7 +507,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
* @pages: Allocated pages.
* @count: Number of allocated pages.
*
- * This function releases memory allocated by alloc_cma().
+ * This function releases memory allocated by cma_alloc().
* It returns false when provided pages do not belong to contiguous area and
* true otherwise.
*/
diff --git a/mm/gup.c b/mm/gup.c
index 8bbaa5523116..98f13ab37bac 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1895,7 +1895,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
}
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
-#if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
+#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
static int __gup_device_huge(unsigned long pfn, unsigned long addr,
unsigned long end, struct page **pages, int *nr)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 249671873aa9..cdbb7a84cb6e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -695,12 +695,15 @@ void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
if (mem_cgroup_disabled())
return;
- __this_cpu_add(memcg->vmstats_local->stat[idx], val);
-
x = val + __this_cpu_read(memcg->vmstats_percpu->stat[idx]);
if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
struct mem_cgroup *mi;
+ /*
+ * Batch local counters to keep them in sync with
+ * the hierarchical ones.
+ */
+ __this_cpu_add(memcg->vmstats_local->stat[idx], x);
for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
atomic_long_add(x, &mi->vmstats[idx]);
x = 0;
@@ -749,13 +752,15 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
/* Update memcg */
__mod_memcg_state(memcg, idx, val);
- /* Update lruvec */
- __this_cpu_add(pn->lruvec_stat_local->count[idx], val);
-
x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
struct mem_cgroup_per_node *pi;
+ /*
+ * Batch local counters to keep them in sync with
+ * the hierarchical ones.
+ */
+ __this_cpu_add(pn->lruvec_stat_local->count[idx], x);
for (pi = pn; pi; pi = parent_nodeinfo(pi, pgdat->node_id))
atomic_long_add(x, &pi->lruvec_stat[idx]);
x = 0;
@@ -777,12 +782,15 @@ void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
if (mem_cgroup_disabled())
return;
- __this_cpu_add(memcg->vmstats_local->events[idx], count);
-
x = count + __this_cpu_read(memcg->vmstats_percpu->events[idx]);
if (unlikely(x > MEMCG_CHARGE_BATCH)) {
struct mem_cgroup *mi;
+ /*
+ * Batch local counters to keep them in sync with
+ * the hierarchical ones.
+ */
+ __this_cpu_add(memcg->vmstats_local->events[idx], x);
for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
atomic_long_add(x, &mi->vmevents[idx]);
x = 0;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6166ba5a15f3..4ebe696138e8 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1734,9 +1734,10 @@ static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1;
pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n",
&beginpa, &endpa);
- }
- return ret;
+ return -EBUSY;
+ }
+ return 0;
}
static int check_cpu_on_node(pg_data_t *pgdat)
@@ -1819,19 +1820,9 @@ static void __release_memory_resource(resource_size_t start,
}
}
-/**
- * remove_memory
- * @nid: the node ID
- * @start: physical address of the region to remove
- * @size: size of the region to remove
- *
- * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
- * and online/offline operations before this call, as required by
- * try_offline_node().
- */
-void __ref __remove_memory(int nid, u64 start, u64 size)
+static int __ref try_remove_memory(int nid, u64 start, u64 size)
{
- int ret;
+ int rc = 0;
BUG_ON(check_hotplug_memory_range(start, size));
@@ -1839,13 +1830,13 @@ void __ref __remove_memory(int nid, u64 start, u64 size)
/*
* All memory blocks must be offlined before removing memory. Check
- * whether all memory blocks in question are offline and trigger a BUG()
+ * whether all memory blocks in question are offline and return error
* if this is not the case.
*/
- ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
- check_memblock_offlined_cb);
- if (ret)
- BUG();
+ rc = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
+ check_memblock_offlined_cb);
+ if (rc)
+ goto done;
/* remove memmap entry */
firmware_map_remove(start, start + size, "System RAM");
@@ -1857,14 +1848,45 @@ void __ref __remove_memory(int nid, u64 start, u64 size)
try_offline_node(nid);
+done:
mem_hotplug_done();
+ return rc;
}
-void remove_memory(int nid, u64 start, u64 size)
+/**
+ * remove_memory
+ * @nid: the node ID
+ * @start: physical address of the region to remove
+ * @size: size of the region to remove
+ *
+ * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
+ * and online/offline operations before this call, as required by
+ * try_offline_node().
+ */
+void __remove_memory(int nid, u64 start, u64 size)
+{
+
+ /*
+ * trigger BUG() is some memory is not offlined prior to calling this
+ * function
+ */
+ if (try_remove_memory(nid, start, size))
+ BUG();
+}
+
+/*
+ * Remove memory if every memory block is offline, otherwise return -EBUSY is
+ * some memory is not offline
+ */
+int remove_memory(int nid, u64 start, u64 size)
{
+ int rc;
+
lock_device_hotplug();
- __remove_memory(nid, start, size);
+ rc = try_remove_memory(nid, start, size);
unlock_device_hotplug();
+
+ return rc;
}
EXPORT_SYMBOL_GPL(remove_memory);
#endif /* CONFIG_MEMORY_HOTREMOVE */
diff --git a/mm/nommu.c b/mm/nommu.c
index eb3e2e558da1..fed1b6e9c89b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1261,7 +1261,9 @@ unsigned long do_mmap(struct file *file,
add_nommu_region(region);
/* clear anonymous mappings that don't ask for uninitialized data */
- if (!vma->vm_file && !(flags & MAP_UNINITIALIZED))
+ if (!vma->vm_file &&
+ (!IS_ENABLED(CONFIG_MMAP_ALLOW_UNINITIALIZED) ||
+ !(flags & MAP_UNINITIALIZED)))
memset((void *)region->vm_start, 0,
region->vm_end - region->vm_start);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8fd7f45a04eb..e515bfcf7f28 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4102,7 +4102,6 @@ static int
__perform_reclaim(gfp_t gfp_mask, unsigned int order,
const struct alloc_context *ac)
{
- struct reclaim_state reclaim_state;
int progress;
unsigned int noreclaim_flag;
unsigned long pflags;
@@ -4114,13 +4113,10 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,
psi_memstall_enter(&pflags);
fs_reclaim_acquire(gfp_mask);
noreclaim_flag = memalloc_noreclaim_save();
- reclaim_state.reclaimed_slab = 0;
- current->reclaim_state = &reclaim_state;
progress = try_to_free_pages(ac->zonelist, order, gfp_mask,
ac->nodemask);
- current->reclaim_state = NULL;
memalloc_noreclaim_restore(noreclaim_flag);
fs_reclaim_release(gfp_mask);
psi_memstall_leave(&pflags);
diff --git a/mm/shmem.c b/mm/shmem.c
index f4dce9c8670d..99497cb32e71 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -400,7 +400,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
static int shmem_huge __read_mostly;
-#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
+#if defined(CONFIG_SYSFS)
static int shmem_parse_huge(const char *str)
{
if (!strcmp(str, "never"))
@@ -417,7 +417,9 @@ static int shmem_parse_huge(const char *str)
return SHMEM_HUGE_FORCE;
return -EINVAL;
}
+#endif
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
static const char *shmem_format_huge(int huge)
{
switch (huge) {
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 6c49dbb3769e..807490fe217a 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1028,7 +1028,8 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name,
}
struct kmem_cache *
-kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init;
+kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init =
+{ /* initialization for https://bugs.llvm.org/show_bug.cgi?id=42570 */ };
EXPORT_SYMBOL(kmalloc_caches);
/*
diff --git a/mm/util.c b/mm/util.c
index 68575a315dc5..e6351a80f248 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -7,6 +7,7 @@
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
+#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
#include <linux/security.h>
#include <linux/swap.h>
@@ -300,6 +301,80 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
}
#endif
+/**
+ * __account_locked_vm - account locked pages to an mm's locked_vm
+ * @mm: mm to account against
+ * @pages: number of pages to account
+ * @inc: %true if @pages should be considered positive, %false if not
+ * @task: task used to check RLIMIT_MEMLOCK
+ * @bypass_rlim: %true if checking RLIMIT_MEMLOCK should be skipped
+ *
+ * Assumes @task and @mm are valid (i.e. at least one reference on each), and
+ * that mmap_sem is held as writer.
+ *
+ * Return:
+ * * 0 on success
+ * * -ENOMEM if RLIMIT_MEMLOCK would be exceeded.
+ */
+int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
+ struct task_struct *task, bool bypass_rlim)
+{
+ unsigned long locked_vm, limit;
+ int ret = 0;
+
+ lockdep_assert_held_write(&mm->mmap_sem);
+
+ locked_vm = mm->locked_vm;
+ if (inc) {
+ if (!bypass_rlim) {
+ limit = task_rlimit(task, RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ if (locked_vm + pages > limit)
+ ret = -ENOMEM;
+ }
+ if (!ret)
+ mm->locked_vm = locked_vm + pages;
+ } else {
+ WARN_ON_ONCE(pages > locked_vm);
+ mm->locked_vm = locked_vm - pages;
+ }
+
+ pr_debug("%s: [%d] caller %ps %c%lu %lu/%lu%s\n", __func__, task->pid,
+ (void *)_RET_IP_, (inc) ? '+' : '-', pages << PAGE_SHIFT,
+ locked_vm << PAGE_SHIFT, task_rlimit(task, RLIMIT_MEMLOCK),
+ ret ? " - exceeded" : "");
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__account_locked_vm);
+
+/**
+ * account_locked_vm - account locked pages to an mm's locked_vm
+ * @mm: mm to account against, may be NULL
+ * @pages: number of pages to account
+ * @inc: %true if @pages should be considered positive, %false if not
+ *
+ * Assumes a non-NULL @mm is valid (i.e. at least one reference on it).
+ *
+ * Return:
+ * * 0 on success, or if mm is NULL
+ * * -ENOMEM if RLIMIT_MEMLOCK would be exceeded.
+ */
+int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc)
+{
+ int ret;
+
+ if (pages == 0 || !mm)
+ return 0;
+
+ down_write(&mm->mmap_sem);
+ ret = __account_locked_vm(mm, pages, inc, current,
+ capable(CAP_IPC_LOCK));
+ up_write(&mm->mmap_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(account_locked_vm);
+
unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flag, unsigned long pgoff)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f8e3dcd527b8..44df66a98f2a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -131,6 +131,9 @@ struct scan_control {
unsigned int file_taken;
unsigned int taken;
} nr;
+
+ /* for recording the reclaimed slab by now */
+ struct reclaim_state reclaim_state;
};
#ifdef ARCH_HAS_PREFETCH
@@ -238,6 +241,18 @@ static void unregister_memcg_shrinker(struct shrinker *shrinker)
}
#endif /* CONFIG_MEMCG_KMEM */
+static void set_task_reclaim_state(struct task_struct *task,
+ struct reclaim_state *rs)
+{
+ /* Check for an overwrite */
+ WARN_ON_ONCE(rs && task->reclaim_state);
+
+ /* Check for the nulling of an already-nulled member */
+ WARN_ON_ONCE(!rs && !task->reclaim_state);
+
+ task->reclaim_state = rs;
+}
+
#ifdef CONFIG_MEMCG
static bool global_reclaim(struct scan_control *sc)
{
@@ -3191,11 +3206,13 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
if (throttle_direct_reclaim(sc.gfp_mask, zonelist, nodemask))
return 1;
+ set_task_reclaim_state(current, &sc.reclaim_state);
trace_mm_vmscan_direct_reclaim_begin(order, sc.gfp_mask);
nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
trace_mm_vmscan_direct_reclaim_end(nr_reclaimed);
+ set_task_reclaim_state(current, NULL);
return nr_reclaimed;
}
@@ -3218,6 +3235,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
};
unsigned long lru_pages;
+ set_task_reclaim_state(current, &sc.reclaim_state);
sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -3235,7 +3253,9 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
+ set_task_reclaim_state(current, NULL);
*nr_scanned = sc.nr_scanned;
+
return sc.nr_reclaimed;
}
@@ -3262,6 +3282,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
.may_shrinkslab = 1,
};
+ set_task_reclaim_state(current, &sc.reclaim_state);
/*
* Unlike direct reclaim via alloc_pages(), memcg's reclaim doesn't
* take care of from where we get pages. So the node where we start the
@@ -3282,6 +3303,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
psi_memstall_leave(&pflags);
trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed);
+ set_task_reclaim_state(current, NULL);
return nr_reclaimed;
}
@@ -3483,6 +3505,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
.may_unmap = 1,
};
+ set_task_reclaim_state(current, &sc.reclaim_state);
psi_memstall_enter(&pflags);
__fs_reclaim_acquire();
@@ -3664,6 +3687,8 @@ out:
snapshot_refaults(NULL, pgdat);
__fs_reclaim_release();
psi_memstall_leave(&pflags);
+ set_task_reclaim_state(current, NULL);
+
/*
* Return the order kswapd stopped reclaiming at as
* prepare_kswapd_sleep() takes it into account. If another caller
@@ -3787,15 +3812,10 @@ static int kswapd(void *p)
unsigned int classzone_idx = MAX_NR_ZONES - 1;
pg_data_t *pgdat = (pg_data_t*)p;
struct task_struct *tsk = current;
-
- struct reclaim_state reclaim_state = {
- .reclaimed_slab = 0,
- };
const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
if (!cpumask_empty(cpumask))
set_cpus_allowed_ptr(tsk, cpumask);
- current->reclaim_state = &reclaim_state;
/*
* Tell the memory management that we're a "memory allocator",
@@ -3857,7 +3877,6 @@ kswapd_try_sleep:
}
tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
- current->reclaim_state = NULL;
return 0;
}
@@ -3922,7 +3941,6 @@ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order,
*/
unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
{
- struct reclaim_state reclaim_state;
struct scan_control sc = {
.nr_to_reclaim = nr_to_reclaim,
.gfp_mask = GFP_HIGHUSER_MOVABLE,
@@ -3934,18 +3952,16 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
.hibernation_mode = 1,
};
struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
- struct task_struct *p = current;
unsigned long nr_reclaimed;
unsigned int noreclaim_flag;
fs_reclaim_acquire(sc.gfp_mask);
noreclaim_flag = memalloc_noreclaim_save();
- reclaim_state.reclaimed_slab = 0;
- p->reclaim_state = &reclaim_state;
+ set_task_reclaim_state(current, &sc.reclaim_state);
nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
- p->reclaim_state = NULL;
+ set_task_reclaim_state(current, NULL);
memalloc_noreclaim_restore(noreclaim_flag);
fs_reclaim_release(sc.gfp_mask);
@@ -4110,7 +4126,6 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
/* Minimum pages needed in order to stay on node */
const unsigned long nr_pages = 1 << order;
struct task_struct *p = current;
- struct reclaim_state reclaim_state;
unsigned int noreclaim_flag;
struct scan_control sc = {
.nr_to_reclaim = max(nr_pages, SWAP_CLUSTER_MAX),
@@ -4135,8 +4150,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
*/
noreclaim_flag = memalloc_noreclaim_save();
p->flags |= PF_SWAPWRITE;
- reclaim_state.reclaimed_slab = 0;
- p->reclaim_state = &reclaim_state;
+ set_task_reclaim_state(p, &sc.reclaim_state);
if (node_pagecache_reclaimable(pgdat) > pgdat->min_unmapped_pages) {
/*
@@ -4148,7 +4162,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
} while (sc.nr_reclaimed < nr_pages && --sc.priority >= 0);
}
- p->reclaim_state = NULL;
+ set_task_reclaim_state(p, NULL);
current->flags &= ~PF_SWAPWRITE;
memalloc_noreclaim_restore(noreclaim_flag);
fs_reclaim_release(sc.gfp_mask);
diff --git a/mm/z3fold.c b/mm/z3fold.c
index dfcd69d08c1e..6c72b18d8b9c 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -101,6 +101,7 @@ struct z3fold_buddy_slots {
* @refcount: reference count for the z3fold page
* @work: work_struct for page layout optimization
* @slots: pointer to the structure holding buddy slots
+ * @pool: pointer to the containing pool
* @cpu: CPU which this page "belongs" to
* @first_chunks: the size of the first buddy in chunks, 0 if free
* @middle_chunks: the size of the middle buddy in chunks, 0 if free
@@ -114,6 +115,7 @@ struct z3fold_header {
struct kref refcount;
struct work_struct work;
struct z3fold_buddy_slots *slots;
+ struct z3fold_pool *pool;
short cpu;
unsigned short first_chunks;
unsigned short middle_chunks;
@@ -193,8 +195,10 @@ static void compact_page_work(struct work_struct *w);
static inline struct z3fold_buddy_slots *alloc_slots(struct z3fold_pool *pool,
gfp_t gfp)
{
- struct z3fold_buddy_slots *slots = kmem_cache_alloc(pool->c_handle,
- gfp);
+ struct z3fold_buddy_slots *slots;
+
+ slots = kmem_cache_alloc(pool->c_handle,
+ (gfp & ~(__GFP_HIGHMEM | __GFP_MOVABLE)));
if (slots) {
memset(slots->slot, 0, sizeof(slots->slot));
@@ -320,6 +324,7 @@ static struct z3fold_header *init_z3fold_page(struct page *page,
zhdr->start_middle = 0;
zhdr->cpu = -1;
zhdr->slots = slots;
+ zhdr->pool = pool;
INIT_LIST_HEAD(&zhdr->buddy);
INIT_WORK(&zhdr->work, compact_page_work);
return zhdr;
@@ -426,7 +431,7 @@ static enum buddy handle_to_buddy(unsigned long handle)
static inline struct z3fold_pool *zhdr_to_pool(struct z3fold_header *zhdr)
{
- return slots_to_pool(zhdr->slots);
+ return zhdr->pool;
}
static void __release_z3fold_page(struct z3fold_header *zhdr, bool locked)
@@ -850,7 +855,7 @@ static int z3fold_alloc(struct z3fold_pool *pool, size_t size, gfp_t gfp,
enum buddy bud;
bool can_sleep = gfpflags_allow_blocking(gfp);
- if (!size || (gfp & __GFP_HIGHMEM))
+ if (!size)
return -EINVAL;
if (size > PAGE_SIZE)
@@ -1345,24 +1350,29 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa
zhdr = page_address(page);
pool = zhdr_to_pool(zhdr);
- if (!trylock_page(page))
- return -EAGAIN;
-
if (!z3fold_page_trylock(zhdr)) {
- unlock_page(page);
return -EAGAIN;
}
if (zhdr->mapped_count != 0) {
z3fold_page_unlock(zhdr);
- unlock_page(page);
return -EBUSY;
}
+ if (work_pending(&zhdr->work)) {
+ z3fold_page_unlock(zhdr);
+ return -EAGAIN;
+ }
new_zhdr = page_address(newpage);
memcpy(new_zhdr, zhdr, PAGE_SIZE);
newpage->private = page->private;
page->private = 0;
z3fold_page_unlock(zhdr);
spin_lock_init(&new_zhdr->page_lock);
+ INIT_WORK(&new_zhdr->work, compact_page_work);
+ /*
+ * z3fold_page_isolate() ensures that new_zhdr->buddy is empty,
+ * so we only have to reinitialize it.
+ */
+ INIT_LIST_HEAD(&new_zhdr->buddy);
new_mapping = page_mapping(page);
__ClearPageMovable(page);
ClearPagePrivate(page);
@@ -1386,7 +1396,6 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa
queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);
page_mapcount_reset(page);
- unlock_page(page);
put_page(page);
return 0;
}