linux-kernel - [PATCH 1/2] vmalloc: Free pages as a batch

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Date:   Mon, 21 Sep 2020 23:46:27 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org, hch@....de,
        Uladzislau Rezki <urezki@...il.com>
Subject: [PATCH 1/2] vmalloc: Free pages as a batch

Use release_pages() to free the pages allocated by vmalloc().  This is
slightly more efficient in terms of disabling and enabling IRQs once
per batch instead of once per page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 mm/vmalloc.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index be4724b916b3..3893fc8915c4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2263,16 +2263,8 @@ static void __vunmap(const void *addr, int deallocate_pages)
 	vm_remove_mappings(area, deallocate_pages);
 
 	if (deallocate_pages) {
-		int i;
-
-		for (i = 0; i < area->nr_pages; i++) {
-			struct page *page = area->pages[i];
-
-			BUG_ON(!page);
-			__free_pages(page, 0);
-		}
+		release_pages(area->pages, area->nr_pages);
 		atomic_long_sub(area->nr_pages, &nr_vmalloc_pages);
-
 		kvfree(area->pages);
 	}
 
-- 
2.28.0