diff mbox series

[v13,07/10] secretmem: add memcg accounting

Message ID 20201201074559.27742-8-rppt@kernel.org (mailing list archive)
State New, archived
Headers show
Series mm: introduce memfd_secret system call to create "secret" memory areas | expand

Commit Message

Mike Rapoport Dec. 1, 2020, 7:45 a.m. UTC 
From: Mike Rapoport <rppt@linux.ibm.com>

Account memory consumed by secretmem to memcg. The accounting is updated
when the memory is actually allocated and freed.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Roman Gushchin <guro@fb.com>
---
 mm/filemap.c   |  3 ++-
 mm/secretmem.c | 36 +++++++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 2 deletions(-)

Comments

Shakeel Butt Dec. 1, 2020, 4:26 p.m. UTC | #1 
On Mon, Nov 30, 2020 at 11:47 PM Mike Rapoport <rppt@kernel.org> wrote:
>
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> Account memory consumed by secretmem to memcg. The accounting is updated
> when the memory is actually allocated and freed.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> Acked-by: Roman Gushchin <guro@fb.com>
> ---
>  mm/filemap.c   |  3 ++-
>  mm/secretmem.c | 36 +++++++++++++++++++++++++++++++++++-
>  2 files changed, 37 insertions(+), 2 deletions(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 249cf489f5df..cf7f1dc9f4b8 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -42,6 +42,7 @@
>  #include <linux/psi.h>
>  #include <linux/ramfs.h>
>  #include <linux/page_idle.h>
> +#include <linux/secretmem.h>
>  #include "internal.h"
>
>  #define CREATE_TRACE_POINTS
> @@ -844,7 +845,7 @@ static noinline int __add_to_page_cache_locked(struct page *page,
>         page->mapping = mapping;
>         page->index = offset;
>
> -       if (!huge) {
> +       if (!huge && !page_is_secretmem(page)) {
>                 error = mem_cgroup_charge(page, current->mm, gfp);
>                 if (error)
>                         goto error;
> diff --git a/mm/secretmem.c b/mm/secretmem.c
> index 52a900a135a5..5e3e5102ad4c 100644
> --- a/mm/secretmem.c
> +++ b/mm/secretmem.c
> @@ -18,6 +18,7 @@
>  #include <linux/memblock.h>
>  #include <linux/pseudo_fs.h>
>  #include <linux/secretmem.h>
> +#include <linux/memcontrol.h>
>  #include <linux/set_memory.h>
>  #include <linux/sched/signal.h>
>
> @@ -44,6 +45,32 @@ struct secretmem_ctx {
>
>  static struct cma *secretmem_cma;
>
> +static int secretmem_account_pages(struct page *page, gfp_t gfp, int order)
> +{
> +       int err;
> +
> +       err = memcg_kmem_charge_page(page, gfp, order);
> +       if (err)
> +               return err;
> +
> +       /*
> +        * seceremem caches are unreclaimable kernel allocations, so treat
> +        * them as unreclaimable slab memory for VM statistics purposes
> +        */
> +       mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
> +                             PAGE_SIZE << order);
> +
> +       return 0;
> +}
> +
> +static void secretmem_unaccount_pages(struct page *page, int order)
> +{
> +
> +       mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
> +                           -PAGE_SIZE << order);

mod_lruvec_page_state()

> +       memcg_kmem_uncharge_page(page, order);
> +}
> +
>  static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
>  {
>         unsigned long nr_pages = (1 << PMD_PAGE_ORDER);
> @@ -56,10 +83,14 @@ static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
>         if (!page)
>                 return -ENOMEM;
>
> -       err = set_direct_map_invalid_noflush(page, nr_pages);
> +       err = secretmem_account_pages(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)
> @@ -76,6 +107,8 @@ static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
>          * won't fail
>          */
>         set_direct_map_default_noflush(page, nr_pages);
> +err_memcg_uncharge:
> +       secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
>  err_cma_release:
>         cma_release(secretmem_cma, page, nr_pages);
>         return err;
> @@ -302,6 +335,7 @@ static void secretmem_cleanup_chunk(struct gen_pool *pool,
>         int i;
>
>         set_direct_map_default_noflush(page, nr_pages);
> +       secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
>
>         for (i = 0; i < nr_pages; i++)
>                 clear_highpage(page + i);
> --
> 2.28.0
>
Mike Rapoport Dec. 1, 2020, 4:44 p.m. UTC | #2 
On Tue, Dec 01, 2020 at 08:26:28AM -0800, Shakeel Butt wrote:
> On Mon, Nov 30, 2020 at 11:47 PM Mike Rapoport <rppt@kernel.org> wrote:
> >
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Account memory consumed by secretmem to memcg. The accounting is updated
> > when the memory is actually allocated and freed.
> >
> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> > Acked-by: Roman Gushchin <guro@fb.com>
> > ---
> >  mm/filemap.c   |  3 ++-
> >  mm/secretmem.c | 36 +++++++++++++++++++++++++++++++++++-
> >  2 files changed, 37 insertions(+), 2 deletions(-)
> >
> > diff --git a/mm/filemap.c b/mm/filemap.c
> > index 249cf489f5df..cf7f1dc9f4b8 100644
> > --- a/mm/filemap.c
> > +++ b/mm/filemap.c
> > @@ -42,6 +42,7 @@
> >  #include <linux/psi.h>
> >  #include <linux/ramfs.h>
> >  #include <linux/page_idle.h>
> > +#include <linux/secretmem.h>
> >  #include "internal.h"
> >
> >  #define CREATE_TRACE_POINTS
> > @@ -844,7 +845,7 @@ static noinline int __add_to_page_cache_locked(struct page *page,
> >         page->mapping = mapping;
> >         page->index = offset;
> >
> > -       if (!huge) {
> > +       if (!huge && !page_is_secretmem(page)) {
> >                 error = mem_cgroup_charge(page, current->mm, gfp);
> >                 if (error)
> >                         goto error;
> > diff --git a/mm/secretmem.c b/mm/secretmem.c
> > index 52a900a135a5..5e3e5102ad4c 100644
> > --- a/mm/secretmem.c
> > +++ b/mm/secretmem.c
> > @@ -18,6 +18,7 @@
> >  #include <linux/memblock.h>
> >  #include <linux/pseudo_fs.h>
> >  #include <linux/secretmem.h>
> > +#include <linux/memcontrol.h>
> >  #include <linux/set_memory.h>
> >  #include <linux/sched/signal.h>
> >
> > @@ -44,6 +45,32 @@ struct secretmem_ctx {
> >
> >  static struct cma *secretmem_cma;
> >
> > +static int secretmem_account_pages(struct page *page, gfp_t gfp, int order)
> > +{
> > +       int err;
> > +
> > +       err = memcg_kmem_charge_page(page, gfp, order);
> > +       if (err)
> > +               return err;
> > +
> > +       /*
> > +        * seceremem caches are unreclaimable kernel allocations, so treat
> > +        * them as unreclaimable slab memory for VM statistics purposes
> > +        */
> > +       mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
> > +                             PAGE_SIZE << order);
> > +
> > +       return 0;
> > +}
> > +
> > +static void secretmem_unaccount_pages(struct page *page, int order)
> > +{
> > +
> > +       mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
> > +                           -PAGE_SIZE << order);
> 
> mod_lruvec_page_state()

Argh... Will fix.

> > +       memcg_kmem_uncharge_page(page, order);
> > +}
> > +
> >  static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
> >  {
> >         unsigned long nr_pages = (1 << PMD_PAGE_ORDER);
> > @@ -56,10 +83,14 @@ static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
> >         if (!page)
> >                 return -ENOMEM;
> >
> > -       err = set_direct_map_invalid_noflush(page, nr_pages);
> > +       err = secretmem_account_pages(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)
> > @@ -76,6 +107,8 @@ static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
> >          * won't fail
> >          */
> >         set_direct_map_default_noflush(page, nr_pages);
> > +err_memcg_uncharge:
> > +       secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
> >  err_cma_release:
> >         cma_release(secretmem_cma, page, nr_pages);
> >         return err;
> > @@ -302,6 +335,7 @@ static void secretmem_cleanup_chunk(struct gen_pool *pool,
> >         int i;
> >
> >         set_direct_map_default_noflush(page, nr_pages);
> > +       secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
> >
> >         for (i = 0; i < nr_pages; i++)
> >                 clear_highpage(page + i);
> > --
> > 2.28.0
> >
diff mbox series

Patch

diff --git a/mm/filemap.c b/mm/filemap.c
index 249cf489f5df..cf7f1dc9f4b8 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -42,6 +42,7 @@ 
 #include <linux/psi.h>
 #include <linux/ramfs.h>
 #include <linux/page_idle.h>
+#include <linux/secretmem.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
@@ -844,7 +845,7 @@  static noinline int __add_to_page_cache_locked(struct page *page,
 	page->mapping = mapping;
 	page->index = offset;
 
-	if (!huge) {
+	if (!huge && !page_is_secretmem(page)) {
 		error = mem_cgroup_charge(page, current->mm, gfp);
 		if (error)
 			goto error;
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 52a900a135a5..5e3e5102ad4c 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -18,6 +18,7 @@ 
 #include <linux/memblock.h>
 #include <linux/pseudo_fs.h>
 #include <linux/secretmem.h>
+#include <linux/memcontrol.h>
 #include <linux/set_memory.h>
 #include <linux/sched/signal.h>
 
@@ -44,6 +45,32 @@  struct secretmem_ctx {
 
 static struct cma *secretmem_cma;
 
+static int secretmem_account_pages(struct page *page, gfp_t gfp, int order)
+{
+	int err;
+
+	err = memcg_kmem_charge_page(page, gfp, order);
+	if (err)
+		return err;
+
+	/*
+	 * seceremem caches are unreclaimable kernel allocations, so treat
+	 * them as unreclaimable slab memory for VM statistics purposes
+	 */
+	mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
+			      PAGE_SIZE << order);
+
+	return 0;
+}
+
+static void secretmem_unaccount_pages(struct page *page, int order)
+{
+
+	mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
+			    -PAGE_SIZE << order);
+	memcg_kmem_uncharge_page(page, order);
+}
+
 static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
 {
 	unsigned long nr_pages = (1 << PMD_PAGE_ORDER);
@@ -56,10 +83,14 @@  static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
 	if (!page)
 		return -ENOMEM;
 
-	err = set_direct_map_invalid_noflush(page, nr_pages);
+	err = secretmem_account_pages(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)
@@ -76,6 +107,8 @@  static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
 	 * won't fail
 	 */
 	set_direct_map_default_noflush(page, nr_pages);
+err_memcg_uncharge:
+	secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
 err_cma_release:
 	cma_release(secretmem_cma, page, nr_pages);
 	return err;
@@ -302,6 +335,7 @@  static void secretmem_cleanup_chunk(struct gen_pool *pool,
 	int i;
 
 	set_direct_map_default_noflush(page, nr_pages);
+	secretmem_unaccount_pages(page, PMD_PAGE_ORDER);
 
 	for (i = 0; i < nr_pages; i++)
 		clear_highpage(page + i);