The patch titled
Subject: mm: cma: remove watermark hacks
has been added to the -mm tree. Its filename is
mm-cma-remove-watermark-hacks.patch
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------------------------------------------------------
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Subject: mm: cma: remove watermark hacks
Commits 2139cbe627b89 ("cma: fix counting of isolated pages") and
d95ea5d18e69951 ("cma: fix watermark checking") introduced a reliable
method of free page accounting when memory is being allocated from CMA
regions, so the workaround introduced earlier by commit 49f223a9cd96c72
("mm: trigger page reclaim in alloc_contig_range() to stabilise
watermarks") can be finally removed.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmzone.h | 9 ------
mm/page_alloc.c | 57 ---------------------------------------
2 files changed, 66 deletions(-)
diff -puN include/linux/mmzone.h~mm-cma-remove-watermark-hacks include/linux/mmzone.h
--- a/include/linux/mmzone.h~mm-cma-remove-watermark-hacks
+++ a/include/linux/mmzone.h
@@ -63,10 +63,8 @@ enum {
#ifdef CONFIG_CMA
# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
-# define cma_wmark_pages(zone) zone->min_cma_pages
#else
# define is_migrate_cma(migratetype) false
-# define cma_wmark_pages(zone) 0
#endif
#define for_each_migratetype_order(order, type) \
@@ -373,13 +371,6 @@ struct zone {
/* see spanned/present_pages for more description */
seqlock_t span_seqlock;
#endif
-#ifdef CONFIG_CMA
- /*
- * CMA needs to increase watermark levels during the allocation
- * process to make sure that the system is not starved.
- */
- unsigned long min_cma_pages;
-#endif
struct free_area free_area[MAX_ORDER];
#ifndef CONFIG_SPARSEMEM
diff -puN mm/page_alloc.c~mm-cma-remove-watermark-hacks mm/page_alloc.c
--- a/mm/page_alloc.c~mm-cma-remove-watermark-hacks
+++ a/mm/page_alloc.c
@@ -5255,10 +5255,6 @@ static void __setup_per_zone_wmarks(void
zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2);
zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1);
- zone->watermark[WMARK_MIN] += cma_wmark_pages(zone);
- zone->watermark[WMARK_LOW] += cma_wmark_pages(zone);
- zone->watermark[WMARK_HIGH] += cma_wmark_pages(zone);
-
setup_zone_migrate_reserve(zone);
spin_unlock_irqrestore(&zone->lock, flags);
}
@@ -5803,54 +5799,6 @@ static int __alloc_contig_migrate_range(
return ret > 0 ? 0 : ret;
}
-/*
- * Update zone's cma pages counter used for watermark level calculation.
- */
-static inline void __update_cma_watermarks(struct zone *zone, int count)
-{
- unsigned long flags;
- spin_lock_irqsave(&zone->lock, flags);
- zone->min_cma_pages += count;
- spin_unlock_irqrestore(&zone->lock, flags);
- setup_per_zone_wmarks();
-}
-
-/*
- * Trigger memory pressure bump to reclaim some pages in order to be able to
- * allocate 'count' pages in single page units. Does similar work as
- *__alloc_pages_slowpath() function.
- */
-static int __reclaim_pages(struct zone *zone, gfp_t gfp_mask, int count)
-{
- enum zone_type high_zoneidx = gfp_zone(gfp_mask);
- struct zonelist *zonelist = node_zonelist(0, gfp_mask);
- int did_some_progress = 0;
- int order = 1;
-
- /*
- * Increase level of watermarks to force kswapd do his job
- * to stabilise at new watermark level.
- */
- __update_cma_watermarks(zone, count);
-
- /* Obey watermarks as if the page was being allocated */
- while (!zone_watermark_ok(zone, 0, low_wmark_pages(zone), 0, 0)) {
- wake_all_kswapd(order, zonelist, high_zoneidx, zone_idx(zone));
-
- did_some_progress = __perform_reclaim(gfp_mask, order, zonelist,
- NULL);
- if (!did_some_progress) {
- /* Exhausted what can be done so it's blamo time */
- out_of_memory(zonelist, gfp_mask, order, NULL, false);
- }
- }
-
- /* Restore original watermark levels. */
- __update_cma_watermarks(zone, -count);
-
- return count;
-}
-
/**
* alloc_contig_range() -- tries to allocate given range of pages
* @start: start PFN to allocate
@@ -5959,11 +5907,6 @@ int alloc_contig_range(unsigned long sta
goto done;
}
- /*
- * Reclaim enough pages to make sure that contiguous allocation
- * will not starve the system.
- */
- __reclaim_pages(zone, GFP_HIGHUSER_MOVABLE, end-start);
/* Grab isolated pages from freelists. */
outer_end = isolate_freepages_range(&cc, outer_start, end);
_
Patches currently in -mm which might be from m.szyprowski@xxxxxxxxxxx are
mm-cma-skip-watermarks-check-for-already-isolated-blocks-in-split_free_page.patch
mm-cma-remove-watermark-hacks.patch
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