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Wed, 03 Jun 2020 12:09:38 -0400 X-MC-Unique: tH3LO5zmM4ewrx7J2dJKIA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B5100835B42; Wed, 3 Jun 2020 16:09:33 +0000 (UTC) Received: from [10.36.113.192] (ovpn-113-192.ams2.redhat.com [10.36.113.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6F8175D9CD; Wed, 3 Jun 2020 16:09:22 +0000 (UTC) Subject: Re: [RFC v2 7/9] mm/damon: Implement callbacks for physical memory monitoring To: SeongJae Park , akpm@linux-foundation.org Cc: SeongJae Park , Jonathan.Cameron@Huawei.com, aarcange@redhat.com, acme@kernel.org, alexander.shishkin@linux.intel.com, amit@kernel.org, benh@kernel.crashing.org, brendan.d.gregg@gmail.com, brendanhiggins@google.com, cai@lca.pw, colin.king@canonical.com, corbet@lwn.net, dwmw@amazon.com, foersleo@amazon.de, irogers@google.com, jolsa@redhat.com, kirill@shutemov.name, mark.rutland@arm.com, mgorman@suse.de, minchan@kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, rdunlap@infradead.org, riel@surriel.com, rientjes@google.com, rostedt@goodmis.org, sblbir@amazon.com, shakeelb@google.com, shuah@kernel.org, sj38.park@gmail.com, snu@amazon.de, vbabka@suse.cz, vdavydov.dev@gmail.com, yang.shi@linux.alibaba.com, ying.huang@intel.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200603141135.10575-1-sjpark@amazon.com> <20200603141135.10575-8-sjpark@amazon.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200603141135.10575-8-sjpark@amazon.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03.06.20 16:11, SeongJae Park wrote: > From: SeongJae Park > > This commit implements the four callbacks (->init_target_regions, > ->update_target_regions, ->prepare_access_check, and ->check_accesses) > for the basic access monitoring of the physical memory address space. > By setting the callback pointers to point those, users can easily > monitor the accesses to the physical memory. > > Internally, it uses the PTE Accessed bit, as similar to that of the > virtual memory support. Also, it supports only page frames that > supported by idle page tracking. Acutally, most of the code is stollen > from idle page tracking. Users who want to use other access check > primitives and monitor the frames that not supported with this > implementation could implement their own callbacks on their own. > > Signed-off-by: SeongJae Park > --- > include/linux/damon.h | 5 ++ > mm/damon.c | 184 ++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 189 insertions(+) > > diff --git a/include/linux/damon.h b/include/linux/damon.h > index 1a788bfd1b4e..f96503a532ea 100644 > --- a/include/linux/damon.h > +++ b/include/linux/damon.h > @@ -216,6 +216,11 @@ void kdamond_update_vm_regions(struct damon_ctx *ctx); > void kdamond_prepare_vm_access_checks(struct damon_ctx *ctx); > unsigned int kdamond_check_vm_accesses(struct damon_ctx *ctx); > > +void kdamond_init_phys_regions(struct damon_ctx *ctx); > +void kdamond_update_phys_regions(struct damon_ctx *ctx); > +void kdamond_prepare_phys_access_checks(struct damon_ctx *ctx); > +unsigned int kdamond_check_phys_accesses(struct damon_ctx *ctx); > + > int damon_set_pids(struct damon_ctx *ctx, int *pids, ssize_t nr_pids); > int damon_set_attrs(struct damon_ctx *ctx, unsigned long sample_int, > unsigned long aggr_int, unsigned long regions_update_int, > diff --git a/mm/damon.c b/mm/damon.c > index f5cbc97a3bbc..6a5c6d540580 100644 > --- a/mm/damon.c > +++ b/mm/damon.c > @@ -19,7 +19,9 @@ > #include > #include > #include > +#include > #include > +#include > #include > #include > #include > @@ -480,6 +482,11 @@ void kdamond_init_vm_regions(struct damon_ctx *ctx) > } > } > > +/* Do nothing. Users should set the initial regions by themselves */ > +void kdamond_init_phys_regions(struct damon_ctx *ctx) > +{ > +} > + > static void damon_mkold(struct mm_struct *mm, unsigned long addr) > { > pte_t *pte = NULL; > @@ -611,6 +618,178 @@ unsigned int kdamond_check_vm_accesses(struct damon_ctx *ctx) > return max_nr_accesses; > } > > +/* access check functions for physical address based regions */ > + > +/* This code is stollen from page_idle.c */ > +static struct page *damon_phys_get_page(unsigned long pfn) > +{ > + struct page *page; > + pg_data_t *pgdat; > + > + if (!pfn_valid(pfn)) > + return NULL; > + Who provides these pfns? Can these be random pfns, supplied unchecked by user space? Or are they at least mapped into some user space process? IOW, do we need a pfn_to_online_page() to make sure the memmap even was initialized? -- Thanks, David / dhildenb