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[35.169.212.159]) by smtp.gmail.com with ESMTPSA id h8sm8293085qtp.46.2021.05.31.06.38.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 May 2021 06:38:29 -0700 (PDT) From: sj38.park@gmail.com To: akpm@linux-foundation.org Cc: SeongJae Park , Jonathan.Cameron@Huawei.com, acme@kernel.org, alexander.shishkin@linux.intel.com, amit@kernel.org, benh@kernel.crashing.org, brendanhiggins@google.com, corbet@lwn.net, david@redhat.com, dwmw@amazon.com, elver@google.com, fan.du@intel.com, foersleo@amazon.de, greg@kroah.com, gthelen@google.com, guoju.fgj@alibaba-inc.com, mgorman@suse.de, minchan@kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, riel@surriel.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, shakeelb@google.com, shuah@kernel.org, sj38.park@gmail.com, snu@zelle79.org, vbabka@suse.cz, vdavydov.dev@gmail.com, zgf574564920@gmail.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 01/13] mm/damon/paddr: Support the pageout scheme Date: Mon, 31 May 2021 13:38:04 +0000 Message-Id: <20210531133816.12689-2-sj38.park@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210531133816.12689-1-sj38.park@gmail.com> References: <20210531133816.12689-1-sj38.park@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: SeongJae Park This commit makes the DAMON primitives for physical address space to support the pageout action for DAMON-based Operation Schemes. IOW, now the users can implement their own data access-aware reclamations for whole system using DAMOS. Signed-off-by: SeongJae Park --- mm/damon/paddr.c | 38 +++++++++++++++++++++++++++++++++++++- mm/damon/prmtv-common.c | 2 +- mm/damon/prmtv-common.h | 2 ++ 3 files changed, 40 insertions(+), 2 deletions(-) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index b92b07a3ce53..303db372e53b 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -7,6 +7,9 @@ #define pr_fmt(fmt) "damon-pa: " fmt +#include + +#include "../internal.h" #include "prmtv-common.h" /* @@ -85,6 +88,39 @@ bool damon_pa_target_valid(void *t) return true; } +int damon_pa_apply_scheme(struct damon_ctx *ctx, struct damon_target *t, + struct damon_region *r, struct damos *scheme) +{ + unsigned long addr; + LIST_HEAD(page_list); + + if (scheme->action != DAMOS_PAGEOUT) + return -EINVAL; + + for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) { + struct page *page = damon_get_page(PHYS_PFN(addr)); + + if (!page) + continue; + + ClearPageReferenced(page); + test_and_clear_page_young(page); + if (isolate_lru_page(page)) { + put_page(page); + continue; + } + if (PageUnevictable(page)) { + putback_lru_page(page); + } else { + list_add(&page->lru, &page_list); + put_page(page); + } + } + reclaim_pages(&page_list); + cond_resched(); + return 0; +} + void damon_pa_set_primitives(struct damon_ctx *ctx) { ctx->primitive.init = NULL; @@ -94,5 +130,5 @@ void damon_pa_set_primitives(struct damon_ctx *ctx) ctx->primitive.reset_aggregated = NULL; ctx->primitive.target_valid = damon_pa_target_valid; ctx->primitive.cleanup = NULL; - ctx->primitive.apply_scheme = NULL; + ctx->primitive.apply_scheme = damon_pa_apply_scheme; } diff --git a/mm/damon/prmtv-common.c b/mm/damon/prmtv-common.c index 08e9318d67ed..01c1c1b37859 100644 --- a/mm/damon/prmtv-common.c +++ b/mm/damon/prmtv-common.c @@ -14,7 +14,7 @@ * The body of this function is stolen from the 'page_idle_get_page()'. We * steal rather than reuse it because the code is quite simple. */ -static struct page *damon_get_page(unsigned long pfn) +struct page *damon_get_page(unsigned long pfn) { struct page *page = pfn_to_online_page(pfn); diff --git a/mm/damon/prmtv-common.h b/mm/damon/prmtv-common.h index 939c41af6b59..ba0c4eecbb79 100644 --- a/mm/damon/prmtv-common.h +++ b/mm/damon/prmtv-common.h @@ -18,6 +18,8 @@ /* Get a random number in [l, r) */ #define damon_rand(l, r) (l + prandom_u32_max(r - l)) +struct page *damon_get_page(unsigned long pfn); + void damon_va_mkold(struct mm_struct *mm, unsigned long addr); bool damon_va_young(struct mm_struct *mm, unsigned long addr, unsigned long *page_sz); -- 2.17.1