The patch titled
Subject: secretmem: add memcg accounting
has been added to the -mm tree. Its filename is
secretmem-add-memcg-accounting.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/secretmem-add-memcg-accounting.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/secretmem-add-memcg-accounting.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Subject: secretmem: add memcg accounting
Account memory consumed by secretmem to memcg. The accounting is updated
when the memory is actually allocated and freed.
Link: https://lkml.kernel.org/r/20201110151444.20662-7-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christopher Lameter <cl@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Elena Reshetova <elena.reshetova@xxxxxxxxx>
Cc: Hagen Paul Pfeifer <hagen@xxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: James Bottomley <jejb@xxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tycho Andersen <tycho@xxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 2 +-
mm/secretmem.c | 42 +++++++++++++++++++++++++++++++++++++++++-
2 files changed, 42 insertions(+), 2 deletions(-)
--- a/mm/filemap.c~secretmem-add-memcg-accounting
+++ a/mm/filemap.c
@@ -844,7 +844,7 @@ static noinline int __add_to_page_cache_
page->mapping = mapping;
page->index = offset;
- if (!huge) {
+ if (!huge && !page->memcg_data) {
error = mem_cgroup_charge(page, current->mm, gfp);
if (error)
goto error;
--- a/mm/secretmem.c~secretmem-add-memcg-accounting
+++ a/mm/secretmem.c
@@ -17,6 +17,7 @@
#include <linux/syscalls.h>
#include <linux/memblock.h>
#include <linux/pseudo_fs.h>
+#include <linux/memcontrol.h>
#include <linux/set_memory.h>
#include <linux/sched/signal.h>
@@ -49,6 +50,38 @@ struct secretmem_ctx {
static struct cma *secretmem_cma;
+static int secretmem_memcg_charge(struct page *page, gfp_t gfp, int order)
+{
+ unsigned long nr_pages = (1 << order);
+ int i, err;
+
+ err = memcg_kmem_charge_page(page, gfp, order);
+ if (err)
+ return err;
+
+ for (i = 1; i < nr_pages; i++) {
+ struct page *p = page + i;
+
+ p->memcg_data = page->memcg_data;
+ }
+
+ return 0;
+}
+
+static void secretmem_memcg_uncharge(struct page *page, int order)
+{
+ unsigned long nr_pages = (1 << order);
+ int i;
+
+ for (i = 1; i < nr_pages; i++) {
+ struct page *p = page + i;
+
+ p->memcg_data = 0;
+ }
+
+ memcg_kmem_uncharge_page(page, PMD_PAGE_ORDER);
+}
+
static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
{
unsigned long nr_pages = (1 << PMD_PAGE_ORDER);
@@ -61,10 +94,14 @@ static int secretmem_pool_increase(struc
if (!page)
return -ENOMEM;
- err = set_direct_map_invalid_noflush(page, nr_pages);
+ err = secretmem_memcg_charge(page, gfp, PMD_PAGE_ORDER);
if (err)
goto err_cma_release;
+ err = set_direct_map_invalid_noflush(page, nr_pages);
+ if (err)
+ goto err_memcg_uncharge;
+
addr = (unsigned long)page_address(page);
err = gen_pool_add(pool, addr, PMD_SIZE, NUMA_NO_NODE);
if (err)
@@ -81,6 +118,8 @@ err_set_direct_map:
* won't fail
*/
set_direct_map_default_noflush(page, nr_pages);
+err_memcg_uncharge:
+ secretmem_memcg_uncharge(page, PMD_PAGE_ORDER);
err_cma_release:
cma_release(secretmem_cma, page, nr_pages);
return err;
@@ -310,6 +349,7 @@ static void secretmem_cleanup_chunk(stru
int i;
set_direct_map_default_noflush(page, nr_pages);
+ secretmem_memcg_uncharge(page, PMD_PAGE_ORDER);
for (i = 0; i < nr_pages; i++)
clear_highpage(page + i);
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxx are
alpha-switch-from-discontigmem-to-sparsemem.patch
ia64-remove-custom-__early_pfn_to_nid.patch
ia64-remove-ifdef-config_zone_dma32-statements.patch
ia64-discontig-paging_init-remove-local-max_pfn-calculation.patch
ia64-split-virtual-map-initialization-out-of-paging_init.patch
ia64-forbid-using-virtual_mem_map-with-flatmem.patch
ia64-make-sparsemem-default-and-disable-discontigmem.patch
arm-remove-config_arch_has_holes_memorymodel.patch
arm-arm64-move-free_unused_memmap-to-generic-mm.patch
arc-use-flatmem-with-freeing-of-unused-memory-map-instead-of-discontigmem.patch
m68k-mm-make-node-data-and-node-setup-depend-on-config_discontigmem.patch
m68k-mm-enable-use-of-generic-memory_modelh-for-discontigmem.patch
m68k-deprecate-discontigmem.patch
mm-introduce-debug_pagealloc_mapunmap_pages-helpers.patch
pm-hibernate-make-direct-map-manipulations-more-explicit.patch
arch-mm-restore-dependency-of-__kernel_map_pages-on-debug_pagealloc.patch
arch-mm-make-kernel_page_present-always-available.patch
mm-add-definition-of-pmd_page_order.patch
mmap-make-mlock_future_check-global.patch
set_memory-allow-set_direct_map__noflush-for-multiple-pages.patch
mm-introduce-memfd_secret-system-call-to-create-secret-memory-areas.patch
secretmem-use-pmd-size-pages-to-amortize-direct-map-fragmentation.patch
secretmem-add-memcg-accounting.patch
pm-hibernate-disable-when-there-are-active-secretmem-users.patch
arch-mm-wire-up-memfd_secret-system-call-were-relevant.patch
secretmem-test-add-basic-selftest-for-memfd_secret2.patch
