The patch titled
Subject: proc: add kpageidle file
has been added to the -mm tree. Its filename is
proc-add-kpageidle-file.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-add-kpageidle-file.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-add-kpageidle-file.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: proc: add kpageidle file
Knowing the portion of memory that is not used by a certain application or
memory cgroup (idle memory) can be useful for partitioning the system
efficiently, e.g. by setting memory cgroup limits appropriately.
Currently, the only means to estimate the amount of idle memory provided
by the kernel is /proc/PID/{clear_refs,smaps}: the user can clear the
access bit for all pages mapped to a particular process by writing 1 to
clear_refs, wait for some time, and then count smaps:Referenced. However,
this method has two serious shortcomings:
- it does not count unmapped file pages
- it affects the reclaimer logic
To overcome these drawbacks, this patch introduces two new page flags,
Idle and Young, and a new proc file, /proc/kpageidle. A page's Idle flag
can only be set from userspace by setting bit in /proc/kpageidle at the
offset corresponding to the page, and it is cleared whenever the page is
accessed either through page tables (it is cleared in page_referenced() in
this case) or using the read(2) system call (mark_page_accessed()). Thus
by setting the Idle flag for pages of a particular workload, which can be
found e.g. by reading /proc/PID/pagemap, waiting for some time to let the
workload access its working set, and then reading the kpageidle file, one
can estimate the amount of pages that are not used by the workload.
The Young page flag is used to avoid interference with the memory
reclaimer. A page's Young flag is set whenever the Access bit of a page
table entry pointing to the page is cleared by writing to kpageidle. If
page_referenced() is called on a Young page, it will add 1 to its return
value, therefore concealing the fact that the Access bit was cleared.
Note, since there is no room for extra page flags on 32 bit, this feature
uses extended page flags when compiled on 32 bit.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Reviewed-by: Andres Lagar-Cavilla <andreslc@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/pagemap.txt | 12 +
fs/proc/page.c | 218 +++++++++++++++++++++++++++++++++
fs/proc/task_mmu.c | 4
include/linux/mm.h | 98 ++++++++++++++
include/linux/page-flags.h | 11 +
include/linux/page_ext.h | 4
mm/Kconfig | 12 +
mm/debug.c | 4
mm/huge_memory.c | 11 +
mm/migrate.c | 5
mm/page_ext.c | 3
mm/rmap.c | 5
mm/swap.c | 2
13 files changed, 385 insertions(+), 4 deletions(-)
diff -puN Documentation/vm/pagemap.txt~proc-add-kpageidle-file Documentation/vm/pagemap.txt
--- a/Documentation/vm/pagemap.txt~proc-add-kpageidle-file
+++ a/Documentation/vm/pagemap.txt
@@ -5,7 +5,7 @@ pagemap is a new (as of 2.6.25) set of i
userspace programs to examine the page tables and related information by
reading files in /proc.
-There are four components to pagemap:
+There are five components to pagemap:
* /proc/pid/pagemap. This file lets a userspace process find out which
physical frame each virtual page is mapped to. It contains one 64-bit
@@ -75,6 +75,16 @@ There are four components to pagemap:
memory cgroup each page is charged to, indexed by PFN. Only available when
CONFIG_MEMCG is set.
+ * /proc/kpageidle. This file implements a bitmap where each bit corresponds
+ to a page, indexed by PFN. When the bit is set, the corresponding page is
+ idle. A page is considered idle if it has not been accessed since it was
+ marked idle. To mark a page idle one should set the bit corresponding to the
+ page by writing to the file. A value written to the file is OR-ed with the
+ current bitmap value. Only user memory pages can be marked idle, for other
+ page types input is silently ignored. Writing to this file beyond max PFN
+ results in the ENXIO error. Only available when CONFIG_IDLE_PAGE_TRACKING is
+ set.
+
Short descriptions to the page flags:
0. LOCKED
diff -puN fs/proc/page.c~proc-add-kpageidle-file fs/proc/page.c
--- a/fs/proc/page.c~proc-add-kpageidle-file
+++ a/fs/proc/page.c
@@ -5,6 +5,8 @@
#include <linux/ksm.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
+#include <linux/rmap.h>
+#include <linux/mmu_notifier.h>
#include <linux/huge_mm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
@@ -16,6 +18,7 @@
#define KPMSIZE sizeof(u64)
#define KPMMASK (KPMSIZE - 1)
+#define KPMBITS (KPMSIZE * BITS_PER_BYTE)
/* /proc/kpagecount - an array exposing page counts
*
@@ -275,6 +278,217 @@ static const struct file_operations proc
};
#endif /* CONFIG_MEMCG */
+#ifdef CONFIG_IDLE_PAGE_TRACKING
+/*
+ * Idle page tracking only considers user memory pages, for other types of
+ * pages the idle flag is always unset and an attempt to set it is silently
+ * ignored.
+ *
+ * We treat a page as a user memory page if it is on an LRU list, because it is
+ * always safe to pass such a page to rmap_walk(), which is essential for idle
+ * page tracking. With such an indicator of user pages we can skip isolated
+ * pages, but since there are not usually many of them, it will hardly affect
+ * the overall result.
+ *
+ * This function tries to get a user memory page by pfn as described above.
+ */
+static struct page *kpageidle_get_page(unsigned long pfn)
+{
+ struct page *page;
+ struct zone *zone;
+
+ if (!pfn_valid(pfn))
+ return NULL;
+
+ page = pfn_to_page(pfn);
+ if (!page || !PageLRU(page) ||
+ !get_page_unless_zero(page))
+ return NULL;
+
+ zone = page_zone(page);
+ spin_lock_irq(&zone->lru_lock);
+ if (unlikely(!PageLRU(page))) {
+ put_page(page);
+ page = NULL;
+ }
+ spin_unlock_irq(&zone->lru_lock);
+ return page;
+}
+
+static int kpageidle_clear_pte_refs_one(struct page *page,
+ struct vm_area_struct *vma,
+ unsigned long addr, void *arg)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ spinlock_t *ptl;
+ pmd_t *pmd;
+ pte_t *pte;
+ bool referenced = false;
+
+ if (unlikely(PageTransHuge(page))) {
+ pmd = page_check_address_pmd(page, mm, addr,
+ PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl);
+ if (pmd) {
+ referenced = pmdp_clear_young_notify(vma, addr, pmd);
+ spin_unlock(ptl);
+ }
+ } else {
+ pte = page_check_address(page, mm, addr, &ptl, 0);
+ if (pte) {
+ referenced = ptep_clear_young_notify(vma, addr, pte);
+ pte_unmap_unlock(pte, ptl);
+ }
+ }
+ if (referenced) {
+ clear_page_idle(page);
+ /*
+ * We cleared the referenced bit in a mapping to this page. To
+ * avoid interference with page reclaim, mark it young so that
+ * page_referenced() will return > 0.
+ */
+ set_page_young(page);
+ }
+ return SWAP_AGAIN;
+}
+
+static void kpageidle_clear_pte_refs(struct page *page)
+{
+ struct rmap_walk_control rwc = {
+ .rmap_one = kpageidle_clear_pte_refs_one,
+ .anon_lock = page_lock_anon_vma_read,
+ };
+ bool need_lock;
+
+ if (!page_mapped(page) ||
+ !page_rmapping(page))
+ return;
+
+ need_lock = !PageAnon(page) || PageKsm(page);
+ if (need_lock && !trylock_page(page))
+ return;
+
+ rmap_walk(page, &rwc);
+
+ if (need_lock)
+ unlock_page(page);
+}
+
+static ssize_t kpageidle_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u64 __user *out = (u64 __user *)buf;
+ struct page *page;
+ unsigned long pfn, end_pfn;
+ ssize_t ret = 0;
+ u64 idle_bitmap = 0;
+ int bit;
+
+ if (*ppos & KPMMASK || count & KPMMASK)
+ return -EINVAL;
+
+ pfn = *ppos * BITS_PER_BYTE;
+ if (pfn >= max_pfn)
+ return 0;
+
+ end_pfn = pfn + count * BITS_PER_BYTE;
+ if (end_pfn > max_pfn)
+ end_pfn = ALIGN(max_pfn, KPMBITS);
+
+ for (; pfn < end_pfn; pfn++) {
+ bit = pfn % KPMBITS;
+ page = kpageidle_get_page(pfn);
+ if (page) {
+ if (page_is_idle(page)) {
+ /*
+ * The page might have been referenced via a
+ * pte, in which case it is not idle. Clear
+ * refs and recheck.
+ */
+ kpageidle_clear_pte_refs(page);
+ if (page_is_idle(page))
+ idle_bitmap |= 1ULL << bit;
+ }
+ put_page(page);
+ }
+ if (bit == KPMBITS - 1) {
+ if (put_user(idle_bitmap, out)) {
+ ret = -EFAULT;
+ break;
+ }
+ idle_bitmap = 0;
+ out++;
+ }
+ }
+
+ *ppos += (char __user *)out - buf;
+ if (!ret)
+ ret = (char __user *)out - buf;
+ return ret;
+}
+
+static ssize_t kpageidle_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ const u64 __user *in = (const u64 __user *)buf;
+ struct page *page;
+ unsigned long pfn, end_pfn;
+ ssize_t ret = 0;
+ u64 idle_bitmap = 0;
+ int bit;
+
+ if (*ppos & KPMMASK || count & KPMMASK)
+ return -EINVAL;
+
+ pfn = *ppos * BITS_PER_BYTE;
+ if (pfn >= max_pfn)
+ return -ENXIO;
+
+ end_pfn = pfn + count * BITS_PER_BYTE;
+ if (end_pfn > max_pfn)
+ end_pfn = ALIGN(max_pfn, KPMBITS);
+
+ for (; pfn < end_pfn; pfn++) {
+ bit = pfn % KPMBITS;
+ if (bit == 0) {
+ if (get_user(idle_bitmap, in)) {
+ ret = -EFAULT;
+ break;
+ }
+ in++;
+ }
+ if (idle_bitmap >> bit & 1) {
+ page = kpageidle_get_page(pfn);
+ if (page) {
+ kpageidle_clear_pte_refs(page);
+ set_page_idle(page);
+ put_page(page);
+ }
+ }
+ }
+
+ *ppos += (const char __user *)in - buf;
+ if (!ret)
+ ret = (const char __user *)in - buf;
+ return ret;
+}
+
+static const struct file_operations proc_kpageidle_operations = {
+ .llseek = mem_lseek,
+ .read = kpageidle_read,
+ .write = kpageidle_write,
+};
+
+#ifndef CONFIG_64BIT
+static bool need_page_idle(void)
+{
+ return true;
+}
+struct page_ext_operations page_idle_ops = {
+ .need = need_page_idle,
+};
+#endif
+#endif /* CONFIG_IDLE_PAGE_TRACKING */
+
static int __init proc_page_init(void)
{
proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
@@ -282,6 +496,10 @@ static int __init proc_page_init(void)
#ifdef CONFIG_MEMCG
proc_create("kpagecgroup", S_IRUSR, NULL, &proc_kpagecgroup_operations);
#endif
+#ifdef CONFIG_IDLE_PAGE_TRACKING
+ proc_create("kpageidle", S_IRUSR | S_IWUSR, NULL,
+ &proc_kpageidle_operations);
+#endif
return 0;
}
fs_initcall(proc_page_init);
diff -puN fs/proc/task_mmu.c~proc-add-kpageidle-file fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~proc-add-kpageidle-file
+++ a/fs/proc/task_mmu.c
@@ -459,7 +459,7 @@ static void smaps_account(struct mem_siz
mss->resident += size;
/* Accumulate the size in pages that have been accessed. */
- if (young || PageReferenced(page))
+ if (young || page_is_young(page) || PageReferenced(page))
mss->referenced += size;
mapcount = page_mapcount(page);
if (mapcount >= 2) {
@@ -808,6 +808,7 @@ static int clear_refs_pte_range(pmd_t *p
/* Clear accessed and referenced bits. */
pmdp_test_and_clear_young(vma, addr, pmd);
+ test_and_clear_page_young(page);
ClearPageReferenced(page);
out:
spin_unlock(ptl);
@@ -835,6 +836,7 @@ out:
/* Clear accessed and referenced bits. */
ptep_test_and_clear_young(vma, addr, pte);
+ test_and_clear_page_young(page);
ClearPageReferenced(page);
}
pte_unmap_unlock(pte - 1, ptl);
diff -puN include/linux/mm.h~proc-add-kpageidle-file include/linux/mm.h
--- a/include/linux/mm.h~proc-add-kpageidle-file
+++ a/include/linux/mm.h
@@ -2231,5 +2231,103 @@ void __init setup_nr_node_ids(void);
static inline void setup_nr_node_ids(void) {}
#endif
+#ifdef CONFIG_IDLE_PAGE_TRACKING
+#ifdef CONFIG_64BIT
+static inline bool page_is_young(struct page *page)
+{
+ return PageYoung(page);
+}
+
+static inline void set_page_young(struct page *page)
+{
+ SetPageYoung(page);
+}
+
+static inline bool test_and_clear_page_young(struct page *page)
+{
+ return TestClearPageYoung(page);
+}
+
+static inline bool page_is_idle(struct page *page)
+{
+ return PageIdle(page);
+}
+
+static inline void set_page_idle(struct page *page)
+{
+ SetPageIdle(page);
+}
+
+static inline void clear_page_idle(struct page *page)
+{
+ ClearPageIdle(page);
+}
+#else /* !CONFIG_64BIT */
+/*
+ * If there is not enough space to store Idle and Young bits in page flags, use
+ * page ext flags instead.
+ */
+extern struct page_ext_operations page_idle_ops;
+
+static inline bool page_is_young(struct page *page)
+{
+ return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
+}
+
+static inline void set_page_young(struct page *page)
+{
+ set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
+}
+
+static inline bool test_and_clear_page_young(struct page *page)
+{
+ return test_and_clear_bit(PAGE_EXT_YOUNG,
+ &lookup_page_ext(page)->flags);
+}
+
+static inline bool page_is_idle(struct page *page)
+{
+ return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
+}
+
+static inline void set_page_idle(struct page *page)
+{
+ set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
+}
+
+static inline void clear_page_idle(struct page *page)
+{
+ clear_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
+}
+#endif /* CONFIG_64BIT */
+#else /* !CONFIG_IDLE_PAGE_TRACKING */
+static inline bool page_is_young(struct page *page)
+{
+ return false;
+}
+
+static inline void set_page_young(struct page *page)
+{
+}
+
+static inline bool test_and_clear_page_young(struct page *page)
+{
+ return false;
+}
+
+static inline bool page_is_idle(struct page *page)
+{
+ return false;
+}
+
+static inline void set_page_idle(struct page *page)
+{
+}
+
+static inline void clear_page_idle(struct page *page)
+{
+}
+#endif /* CONFIG_IDLE_PAGE_TRACKING */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */
diff -puN include/linux/page-flags.h~proc-add-kpageidle-file include/linux/page-flags.h
--- a/include/linux/page-flags.h~proc-add-kpageidle-file
+++ a/include/linux/page-flags.h
@@ -109,6 +109,10 @@ enum pageflags {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
PG_compound_lock,
#endif
+#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
+ PG_young,
+ PG_idle,
+#endif
__NR_PAGEFLAGS,
/* Filesystems */
@@ -289,6 +293,13 @@ PAGEFLAG_FALSE(HWPoison)
#define __PG_HWPOISON 0
#endif
+#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
+TESTPAGEFLAG(Young, young, PF_ANY)
+SETPAGEFLAG(Young, young, PF_ANY)
+TESTCLEARFLAG(Young, young, PF_ANY)
+PAGEFLAG(Idle, idle, PF_ANY)
+#endif
+
/*
* On an anonymous page mapped into a user virtual memory area,
* page->mapping points to its anon_vma, not to a struct address_space;
diff -puN include/linux/page_ext.h~proc-add-kpageidle-file include/linux/page_ext.h
--- a/include/linux/page_ext.h~proc-add-kpageidle-file
+++ a/include/linux/page_ext.h
@@ -26,6 +26,10 @@ enum page_ext_flags {
PAGE_EXT_DEBUG_POISON, /* Page is poisoned */
PAGE_EXT_DEBUG_GUARD,
PAGE_EXT_OWNER,
+#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
+ PAGE_EXT_YOUNG,
+ PAGE_EXT_IDLE,
+#endif
};
/*
diff -puN mm/Kconfig~proc-add-kpageidle-file mm/Kconfig
--- a/mm/Kconfig~proc-add-kpageidle-file
+++ a/mm/Kconfig
@@ -654,3 +654,15 @@ config DEFERRED_STRUCT_PAGE_INIT
when kswapd starts. This has a potential performance impact on
processes running early in the lifetime of the systemm until kswapd
finishes the initialisation.
+
+config IDLE_PAGE_TRACKING
+ bool "Enable idle page tracking"
+ select PROC_PAGE_MONITOR
+ select PAGE_EXTENSION if !64BIT
+ help
+ This feature allows to estimate the amount of user pages that have
+ not been touched during a given period of time. This information can
+ be useful to tune memory cgroup limits and/or for job placement
+ within a compute cluster.
+
+ See Documentation/vm/pagemap.txt for more details.
diff -puN mm/debug.c~proc-add-kpageidle-file mm/debug.c
--- a/mm/debug.c~proc-add-kpageidle-file
+++ a/mm/debug.c
@@ -48,6 +48,10 @@ static const struct trace_print_flags pa
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
{1UL << PG_compound_lock, "compound_lock" },
#endif
+#if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
+ {1UL << PG_young, "young" },
+ {1UL << PG_idle, "idle" },
+#endif
};
static void dump_flags(unsigned long flags,
diff -puN mm/huge_memory.c~proc-add-kpageidle-file mm/huge_memory.c
--- a/mm/huge_memory.c~proc-add-kpageidle-file
+++ a/mm/huge_memory.c
@@ -1772,6 +1772,11 @@ static void __split_huge_page_refcount(s
/* clear PageTail before overwriting first_page */
smp_wmb();
+ if (page_is_young(page))
+ set_page_young(page_tail);
+ if (page_is_idle(page))
+ set_page_idle(page_tail);
+
/*
* __split_huge_page_splitting() already set the
* splitting bit in all pmd that could map this
@@ -2277,7 +2282,8 @@ static int __collapse_huge_page_isolate(
VM_BUG_ON_PAGE(PageLRU(page), page);
/* If there is no mapped pte young don't collapse the page */
- if (pte_young(pteval) || PageReferenced(page) ||
+ if (pte_young(pteval) ||
+ page_is_young(page) || PageReferenced(page) ||
mmu_notifier_test_young(vma->vm_mm, address))
referenced = true;
}
@@ -2704,7 +2710,8 @@ static int khugepaged_scan_pmd(struct mm
*/
if (page_count(page) != 1 + !!PageSwapCache(page))
goto out_unmap;
- if (pte_young(pteval) || PageReferenced(page) ||
+ if (pte_young(pteval) ||
+ page_is_young(page) || PageReferenced(page) ||
mmu_notifier_test_young(vma->vm_mm, address))
referenced = true;
}
diff -puN mm/migrate.c~proc-add-kpageidle-file mm/migrate.c
--- a/mm/migrate.c~proc-add-kpageidle-file
+++ a/mm/migrate.c
@@ -524,6 +524,11 @@ void migrate_page_copy(struct page *newp
__set_page_dirty_nobuffers(newpage);
}
+ if (page_is_young(page))
+ set_page_young(newpage);
+ if (page_is_idle(page))
+ set_page_idle(newpage);
+
/*
* Copy NUMA information to the new page, to prevent over-eager
* future migrations of this same page.
diff -puN mm/page_ext.c~proc-add-kpageidle-file mm/page_ext.c
--- a/mm/page_ext.c~proc-add-kpageidle-file
+++ a/mm/page_ext.c
@@ -59,6 +59,9 @@ static struct page_ext_operations *page_
#ifdef CONFIG_PAGE_OWNER
&page_owner_ops,
#endif
+#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
+ &page_idle_ops,
+#endif
};
static unsigned long total_usage;
diff -puN mm/rmap.c~proc-add-kpageidle-file mm/rmap.c
--- a/mm/rmap.c~proc-add-kpageidle-file
+++ a/mm/rmap.c
@@ -888,6 +888,11 @@ static int page_referenced_one(struct pa
pte_unmap_unlock(pte, ptl);
}
+ if (referenced)
+ clear_page_idle(page);
+ if (test_and_clear_page_young(page))
+ referenced++;
+
if (referenced) {
pra->referenced++;
pra->vm_flags |= vma->vm_flags;
diff -puN mm/swap.c~proc-add-kpageidle-file mm/swap.c
--- a/mm/swap.c~proc-add-kpageidle-file
+++ a/mm/swap.c
@@ -622,6 +622,8 @@ void mark_page_accessed(struct page *pag
} else if (!PageReferenced(page)) {
SetPageReferenced(page);
}
+ if (page_is_idle(page))
+ clear_page_idle(page);
}
EXPORT_SYMBOL(mark_page_accessed);
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
memcg-export-struct-mem_cgroup.patch
memcg-export-struct-mem_cgroup-fix.patch
memcg-export-struct-mem_cgroup-fix-2.patch
memcg-get-rid-of-mem_cgroup_root_css-for-config_memcg.patch
memcg-get-rid-of-extern-for-functions-in-memcontrolh.patch
memcg-restructure-mem_cgroup_can_attach.patch
memcg-tcp_kmem-check-for-cg_proto-in-sock_update_memcg.patch
memcg-add-page_cgroup_ino-helper.patch
hwpoison-use-page_cgroup_ino-for-filtering-by-memcg.patch
memcg-zap-try_get_mem_cgroup_from_page.patch
proc-add-kpagecgroup-file.patch
mmu-notifier-add-clear_young-callback.patch
proc-add-kpageidle-file.patch
proc-export-idle-flag-via-kpageflags.patch
proc-add-cond_resched-to-proc-kpage-read-write-loop.patch
mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
mm-swap-zswap-maybe_preload-refactoring.patch
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