[PATCH] kvm, mm: account shadow page tables to kmemcg

From: Shakeel Butt <shakeelb@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Michal Hocko" <mhocko@kernel.org>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Vladimir Davydov" <vdavydov.dev@gmail.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Greg Thelen" <gthelen@google.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Peter Feiner" <pfeiner@google.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-mm@kvack.org, "Shakeel Butt" <shakeelb@google.com>
Subject: [PATCH] kvm, mm: account shadow page tables to kmemcg
Date: Wed, 27 Jun 2018 11:13:49 -0700	[thread overview]
Message-ID: <20180627181349.149778-1-shakeelb@google.com> (raw)

The size of kvm's shadow page tables corresponds to the size of the
guest virtual machines on the system. Large VMs can spend a significant
amount of memory as shadow page tables which can not be left as system
memory overhead. So, account shadow page tables to the kmemcg.

Signed-off-by: Shakeel Butt <shakeelb@google.com>
---
 arch/x86/kvm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index d594690d8b95..c79a398300f5 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -890,7 +890,7 @@ static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache,
 	if (cache->nobjs >= min)
 		return 0;
 	while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
-		page = (void *)__get_free_page(GFP_KERNEL);
+		page = (void *)__get_free_page(GFP_KERNEL|__GFP_ACCOUNT);
 		if (!page)
 			return -ENOMEM;
 		cache->objects[cache->nobjs++] = page;
-- 
2.18.0.rc2.346.g013aa6912e-goog

