linux-kernel - [PATCH 1/2] mm,compaction,cma: add alloc_contig flag to compact

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Message-Id: <20200227213238.1298752-1-riel@surriel.com>
Date:   Thu, 27 Feb 2020 16:32:28 -0500
From:   Rik van Riel <riel@...riel.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        mhocko@...nel.org, vbabka@...e.cz, mgorman@...hsingularity.net,
        rientjes@...gle.com, aarcange@...hat.com, ziy@...dia.com,
        Rik van Riel <riel@...riel.com>
Subject: [PATCH 1/2] mm,compaction,cma: add alloc_contig flag to compact_control

Add information to struct compact_control to indicate that the allocator
would really like to clear out this specific part of memory, used by for
example CMA.

Signed-off-by: Rik van Riel <riel@...riel.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/internal.h   | 1 +
 mm/page_alloc.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/mm/internal.h b/mm/internal.h
index 3cf20ab3ca01..78492d9815b4 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -206,6 +206,7 @@ struct compact_control {
 	bool whole_zone;		/* Whole zone should/has been scanned */
 	bool contended;			/* Signal lock or sched contention */
 	bool rescan;			/* Rescanning the same pageblock */
+	bool alloc_contig;		/* alloc_contig_range allocation */
 };
 
 /*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3c4eb750a199..a36736812596 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8402,6 +8402,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 		.ignore_skip_hint = true,
 		.no_set_skip_hint = true,
 		.gfp_mask = current_gfp_context(gfp_mask),
+		.alloc_contig = true,
 	};
 	INIT_LIST_HEAD(&cc.migratepages);
 
-- 
2.24.1