linux-kernel - [PATCH v8 6/9] secretmem: add memcg accounting

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Message-Id: <20201110151444.20662-7-rppt@kernel.org>
Date:   Tue, 10 Nov 2020 17:14:41 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...nel.org>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-riscv@...ts.infradead.org,
        x86@...nel.org
Subject: [PATCH v8 6/9] secretmem: add memcg accounting

From: Mike Rapoport <rppt@...ux.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@...ux.ibm.com>
---
 mm/filemap.c   |  2 +-
 mm/secretmem.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 249cf489f5df..11387a077373 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -844,7 +844,7 @@ static noinline int __add_to_page_cache_locked(struct page *page,
 	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;
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 1aa2b7cffe0d..1eb7667016fa 100644
--- a/mm/secretmem.c
+++ b/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(struct secretmem_ctx *ctx, gfp_t gfp)
 	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 @@ 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_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(struct gen_pool *pool,
 	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);
-- 
2.28.0