Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755518Ab3G2FgS (ORCPT ); Mon, 29 Jul 2013 01:36:18 -0400 Received: from LGEMRELSE7Q.lge.com ([156.147.1.151]:55542 "EHLO LGEMRELSE7Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755114Ab3G2FcW (ORCPT ); Mon, 29 Jul 2013 01:32:22 -0400 X-AuditID: 9c930197-b7bfbae000000e88-0c-51f5fe63c015 From: Joonsoo Kim To: Andrew Morton Cc: Rik van Riel , Mel Gorman , Michal Hocko , "Aneesh Kumar K.V" , KAMEZAWA Hiroyuki , Hugh Dickins , Davidlohr Bueso , David Gibson , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim , Wanpeng Li , Naoya Horiguchi , Hillf Danton , Joonsoo Kim Subject: [PATCH 03/18] mm, hugetlb: unify region structure handling Date: Mon, 29 Jul 2013 14:31:54 +0900 Message-Id: <1375075929-6119-4-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1375075929-6119-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1375075929-6119-1-git-send-email-iamjoonsoo.kim@lge.com> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6030 Lines: 181 Currently, to track a reserved and allocated region, we use two different ways for MAP_SHARED and MAP_PRIVATE. For MAP_SHARED, we use address_mapping's private_list and, for MAP_PRIVATE, we use a resv_map. Now, we are preparing to change a coarse grained lock which protect a region structure to fine grained lock, and this difference hinder it. So, before changing it, unify region structure handling. Signed-off-by: Joonsoo Kim diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index a3f868a..a1ae3ada 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -366,7 +366,12 @@ static void truncate_hugepages(struct inode *inode, loff_t lstart) static void hugetlbfs_evict_inode(struct inode *inode) { + struct resv_map *resv_map; + truncate_hugepages(inode, 0); + resv_map = (struct resv_map *)inode->i_mapping->private_data; + if (resv_map) + kref_put(&resv_map->refs, resv_map_release); clear_inode(inode); } @@ -468,6 +473,11 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev) { struct inode *inode; + struct resv_map *resv_map; + + resv_map = resv_map_alloc(); + if (!resv_map) + return NULL; inode = new_inode(sb); if (inode) { @@ -477,7 +487,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, inode->i_mapping->a_ops = &hugetlbfs_aops; inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; - INIT_LIST_HEAD(&inode->i_mapping->private_list); + inode->i_mapping->private_data = resv_map; info = HUGETLBFS_I(inode); /* * The policy is initialized here even if we are creating a diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 6b4890f..2677c07 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -5,6 +5,8 @@ #include #include #include +#include +#include struct ctl_table; struct user_struct; @@ -22,6 +24,13 @@ struct hugepage_subpool { long max_hpages, used_hpages; }; +struct resv_map { + struct kref refs; + struct list_head regions; +}; +extern struct resv_map *resv_map_alloc(void); +void resv_map_release(struct kref *ref); + extern spinlock_t hugetlb_lock; extern int hugetlb_max_hstate __read_mostly; #define for_each_hstate(h) \ diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 12b6581..35f6b12 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -375,12 +375,7 @@ static void set_vma_private_data(struct vm_area_struct *vma, vma->vm_private_data = (void *)value; } -struct resv_map { - struct kref refs; - struct list_head regions; -}; - -static struct resv_map *resv_map_alloc(void) +struct resv_map *resv_map_alloc(void) { struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL); if (!resv_map) @@ -392,7 +387,7 @@ static struct resv_map *resv_map_alloc(void) return resv_map; } -static void resv_map_release(struct kref *ref) +void resv_map_release(struct kref *ref) { struct resv_map *resv_map = container_of(ref, struct resv_map, refs); @@ -1086,8 +1081,9 @@ static long vma_needs_reservation(struct hstate *h, if (vma->vm_flags & VM_MAYSHARE) { pgoff_t idx = vma_hugecache_offset(h, vma, addr); - return region_chg(&inode->i_mapping->private_list, - idx, idx + 1); + struct resv_map *resv = inode->i_mapping->private_data; + + return region_chg(&resv->regions, idx, idx + 1); } else if (!is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { return 1; @@ -1111,7 +1107,9 @@ static void vma_commit_reservation(struct hstate *h, if (vma->vm_flags & VM_MAYSHARE) { pgoff_t idx = vma_hugecache_offset(h, vma, addr); - region_add(&inode->i_mapping->private_list, idx, idx + 1); + struct resv_map *resv = inode->i_mapping->private_data; + + region_add(&resv->regions, idx, idx + 1); } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { pgoff_t idx = vma_hugecache_offset(h, vma, addr); @@ -3061,6 +3059,7 @@ int hugetlb_reserve_pages(struct inode *inode, long ret, chg; struct hstate *h = hstate_inode(inode); struct hugepage_subpool *spool = subpool_inode(inode); + struct resv_map *resv_map; /* * Only apply hugepage reservation if asked. At fault time, an @@ -3076,10 +3075,13 @@ int hugetlb_reserve_pages(struct inode *inode, * to reserve the full area even if read-only as mprotect() may be * called to make the mapping read-write. Assume !vma is a shm mapping */ - if (!vma || vma->vm_flags & VM_MAYSHARE) - chg = region_chg(&inode->i_mapping->private_list, from, to); - else { - struct resv_map *resv_map = resv_map_alloc(); + if (!vma || vma->vm_flags & VM_MAYSHARE) { + resv_map = inode->i_mapping->private_data; + + chg = region_chg(&resv_map->regions, from, to); + + } else { + resv_map = resv_map_alloc(); if (!resv_map) return -ENOMEM; @@ -3122,7 +3124,7 @@ int hugetlb_reserve_pages(struct inode *inode, * else has to be done for private mappings here */ if (!vma || vma->vm_flags & VM_MAYSHARE) - region_add(&inode->i_mapping->private_list, from, to); + region_add(&resv_map->regions, from, to); return 0; out_err: if (vma) @@ -3133,9 +3135,12 @@ out_err: void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed) { struct hstate *h = hstate_inode(inode); - long chg = region_truncate(&inode->i_mapping->private_list, offset); + struct resv_map *resv_map = inode->i_mapping->private_data; + long chg = 0; struct hugepage_subpool *spool = subpool_inode(inode); + if (resv_map) + chg = region_truncate(&resv_map->regions, offset); spin_lock(&inode->i_lock); inode->i_blocks -= (blocks_per_huge_page(h) * freed); spin_unlock(&inode->i_lock); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/