From: Minchan Kim <[email protected]> Add support to purge vrange file pages via the shrinker interface.
This is useful, since some filesystems like shmem/tmpfs use anonymous pages, which won't be aged off the page LRU if swap is disabled. Cc: Andrew Morton <[email protected]> Cc: Android Kernel Team <[email protected]> Cc: Robert Love <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Dmitry Adamushko <[email protected]> Cc: Dave Chinner <[email protected]> Cc: Neil Brown <[email protected]> Cc: Andrea Righi <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Aneesh Kumar K.V <[email protected]> Cc: Mike Hommey <[email protected]> Cc: Taras Glek <[email protected]> Cc: Dhaval Giani <[email protected]> Cc: Jan Kara <[email protected]> Cc: KOSAKI Motohiro <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: Rob Clark <[email protected]> Cc: Minchan Kim <[email protected]> Cc: [email protected] <[email protected]> Signed-off-by: Minchan Kim <[email protected]> [jstultz: Commit message tweaks] Signed-off-by: John Stultz <[email protected]> --- mm/vrange.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 49 insertions(+), 7 deletions(-) diff --git a/mm/vrange.c b/mm/vrange.c index c6bc32f..3f21dc9 100644 --- a/mm/vrange.c +++ b/mm/vrange.c @@ -13,6 +13,7 @@ #include <linux/mmu_notifier.h> #include <linux/mm_inline.h> #include <linux/migrate.h> +#include <linux/pagevec.h> static struct kmem_cache *vrange_cachep; @@ -854,21 +855,62 @@ out: return ret; } +static int __discard_vrange_file(struct address_space *mapping, + struct vrange *vrange, unsigned int *ret_discard) +{ + struct pagevec pvec; + pgoff_t index; + int i; + unsigned int nr_discard = 0; + unsigned long start_idx = vrange->node.start; + unsigned long end_idx = vrange->node.last; + const pgoff_t start = start_idx >> PAGE_CACHE_SHIFT; + pgoff_t end = end_idx >> PAGE_CACHE_SHIFT; + LIST_HEAD(pagelist); + + pagevec_init(&pvec, 0); + index = start; + while (index <= end && pagevec_lookup(&pvec, mapping, index, + min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { + for (i = 0; i < pagevec_count(&pvec); i++) { + struct page *page = pvec.pages[i]; + index = page->index; + if (index > end) + break; + if (isolate_lru_page(page)) + continue; + list_add(&page->lru, &pagelist); + inc_zone_page_state(page, NR_ISOLATED_ANON); + } + pagevec_release(&pvec); + cond_resched(); + index++; + } + + if (!list_empty(&pagelist)) + nr_discard = discard_vrange_pagelist(&pagelist); + + *ret_discard = nr_discard; + putback_lru_pages(&pagelist); + + return 0; +} + static int discard_vrange(struct vrange *vrange) { int ret = 0; - struct mm_struct *mm; struct vrange_root *vroot; unsigned int nr_discard = 0; vroot = vrange->owner; - /* TODO : handle VRANGE_FILE */ - if (vroot->type != VRANGE_MM) - goto out; + if (vroot->type == VRANGE_MM) { + struct mm_struct *mm = vroot->object; + ret = __discard_vrange_anon(mm, vrange, &nr_discard); + } else if (vroot->type == VRANGE_FILE) { + struct address_space *mapping = vroot->object; + ret = __discard_vrange_file(mapping, vrange, &nr_discard); + } - mm = vroot->object; - ret = __discard_vrange_anon(mm, vrange, &nr_discard); -out: return nr_discard; } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
