mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Mike Rapoport](/assets/img/avatar_default.png)
Move remaining definitions and declarations from include/linux/bootmem.h into include/linux/memblock.h and remove the redundant header. The includes were replaced with the semantic patch below and then semi-automated removal of duplicated '#include <linux/memblock.h> @@ @@ - #include <linux/bootmem.h> + #include <linux/memblock.h> [sfr@canb.auug.org.au: dma-direct: fix up for the removal of linux/bootmem.h] Link: http://lkml.kernel.org/r/20181002185342.133d1680@canb.auug.org.au [sfr@canb.auug.org.au: powerpc: fix up for removal of linux/bootmem.h] Link: http://lkml.kernel.org/r/20181005161406.73ef8727@canb.auug.org.au [sfr@canb.auug.org.au: x86/kaslr, ACPI/NUMA: fix for linux/bootmem.h removal] Link: http://lkml.kernel.org/r/20181008190341.5e396491@canb.auug.org.au Link: http://lkml.kernel.org/r/1536927045-23536-30-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <lftan@altera.com> Cc: Mark Salter <msalter@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Serge Semin <fancer.lancer@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
238 lines
5.5 KiB
C
238 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/rmap.h>
|
|
#include <linux/mmu_notifier.h>
|
|
#include <linux/page_ext.h>
|
|
#include <linux/page_idle.h>
|
|
|
|
#define BITMAP_CHUNK_SIZE sizeof(u64)
|
|
#define BITMAP_CHUNK_BITS (BITMAP_CHUNK_SIZE * BITS_PER_BYTE)
|
|
|
|
/*
|
|
* 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 *page_idle_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(zone));
|
|
if (unlikely(!PageLRU(page))) {
|
|
put_page(page);
|
|
page = NULL;
|
|
}
|
|
spin_unlock_irq(zone_lru_lock(zone));
|
|
return page;
|
|
}
|
|
|
|
static bool page_idle_clear_pte_refs_one(struct page *page,
|
|
struct vm_area_struct *vma,
|
|
unsigned long addr, void *arg)
|
|
{
|
|
struct page_vma_mapped_walk pvmw = {
|
|
.page = page,
|
|
.vma = vma,
|
|
.address = addr,
|
|
};
|
|
bool referenced = false;
|
|
|
|
while (page_vma_mapped_walk(&pvmw)) {
|
|
addr = pvmw.address;
|
|
if (pvmw.pte) {
|
|
/*
|
|
* For PTE-mapped THP, one sub page is referenced,
|
|
* the whole THP is referenced.
|
|
*/
|
|
if (ptep_clear_young_notify(vma, addr, pvmw.pte))
|
|
referenced = true;
|
|
} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
|
|
if (pmdp_clear_young_notify(vma, addr, pvmw.pmd))
|
|
referenced = true;
|
|
} else {
|
|
/* unexpected pmd-mapped page? */
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
}
|
|
|
|
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 true;
|
|
}
|
|
|
|
static void page_idle_clear_pte_refs(struct page *page)
|
|
{
|
|
/*
|
|
* Since rwc.arg is unused, rwc is effectively immutable, so we
|
|
* can make it static const to save some cycles and stack.
|
|
*/
|
|
static const struct rmap_walk_control rwc = {
|
|
.rmap_one = page_idle_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, (struct rmap_walk_control *)&rwc);
|
|
|
|
if (need_lock)
|
|
unlock_page(page);
|
|
}
|
|
|
|
static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t pos, size_t count)
|
|
{
|
|
u64 *out = (u64 *)buf;
|
|
struct page *page;
|
|
unsigned long pfn, end_pfn;
|
|
int bit;
|
|
|
|
if (pos % BITMAP_CHUNK_SIZE || count % BITMAP_CHUNK_SIZE)
|
|
return -EINVAL;
|
|
|
|
pfn = pos * 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, BITMAP_CHUNK_BITS);
|
|
|
|
for (; pfn < end_pfn; pfn++) {
|
|
bit = pfn % BITMAP_CHUNK_BITS;
|
|
if (!bit)
|
|
*out = 0ULL;
|
|
page = page_idle_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.
|
|
*/
|
|
page_idle_clear_pte_refs(page);
|
|
if (page_is_idle(page))
|
|
*out |= 1ULL << bit;
|
|
}
|
|
put_page(page);
|
|
}
|
|
if (bit == BITMAP_CHUNK_BITS - 1)
|
|
out++;
|
|
cond_resched();
|
|
}
|
|
return (char *)out - buf;
|
|
}
|
|
|
|
static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t pos, size_t count)
|
|
{
|
|
const u64 *in = (u64 *)buf;
|
|
struct page *page;
|
|
unsigned long pfn, end_pfn;
|
|
int bit;
|
|
|
|
if (pos % BITMAP_CHUNK_SIZE || count % BITMAP_CHUNK_SIZE)
|
|
return -EINVAL;
|
|
|
|
pfn = pos * 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, BITMAP_CHUNK_BITS);
|
|
|
|
for (; pfn < end_pfn; pfn++) {
|
|
bit = pfn % BITMAP_CHUNK_BITS;
|
|
if ((*in >> bit) & 1) {
|
|
page = page_idle_get_page(pfn);
|
|
if (page) {
|
|
page_idle_clear_pte_refs(page);
|
|
set_page_idle(page);
|
|
put_page(page);
|
|
}
|
|
}
|
|
if (bit == BITMAP_CHUNK_BITS - 1)
|
|
in++;
|
|
cond_resched();
|
|
}
|
|
return (char *)in - buf;
|
|
}
|
|
|
|
static struct bin_attribute page_idle_bitmap_attr =
|
|
__BIN_ATTR(bitmap, 0600,
|
|
page_idle_bitmap_read, page_idle_bitmap_write, 0);
|
|
|
|
static struct bin_attribute *page_idle_bin_attrs[] = {
|
|
&page_idle_bitmap_attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group page_idle_attr_group = {
|
|
.bin_attrs = page_idle_bin_attrs,
|
|
.name = "page_idle",
|
|
};
|
|
|
|
#ifndef CONFIG_64BIT
|
|
static bool need_page_idle(void)
|
|
{
|
|
return true;
|
|
}
|
|
struct page_ext_operations page_idle_ops = {
|
|
.need = need_page_idle,
|
|
};
|
|
#endif
|
|
|
|
static int __init page_idle_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = sysfs_create_group(mm_kobj, &page_idle_attr_group);
|
|
if (err) {
|
|
pr_err("page_idle: register sysfs failed\n");
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
subsys_initcall(page_idle_init);
|