From: Andrew Morton <akpm@linux-foundation.org>
To: aarcange@redhat.com, adobriyan@gmail.com, airlied@linux.ie,
akpm@linux-foundation.org, daniel@ffwll.ch,
david@gibson.dropbear.id.au, galpress@amazon.com, hch@lst.de,
jack@suse.cz, jannh@google.com, jgg@ziepe.ca,
kirill@shutemov.name, ktkhai@virtuozzo.com, linmiaohe@huawei.com,
linux-graphics-maintainer@vmware.com, linux-mm@kvack.org,
mike.kravetz@oracle.com, mm-commits@vger.kernel.org,
peterx@redhat.com, rppt@linux.vnet.ibm.com, sroland@vmware.com,
torvalds@linux-foundation.org, willy@infradead.org,
wzam@amazon.com
Subject: [patch 07/29] hugetlb: break earlier in add_reservation_in_range() when we can
Date: Fri, 12 Mar 2021 21:07:22 -0800 [thread overview]
Message-ID: <20210313050722.nUfetTcPM%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210312210632.9b7d62973d72a56fb13c7a03@linux-foundation.org>
From: Peter Xu <peterx@redhat.com>
Subject: hugetlb: break earlier in add_reservation_in_range() when we can
All the regions maintained in hugetlb reserved map is inclusive on "from"
but exclusive on "to". We can break earlier even if rg->from==t because
it already means no possible intersection.
This does not need a Fixes in all cases because when it happens
(rg->from==t) we'll not break out of the loop while we should, however the
next thing we'd do is still add the last file_region we'd need and quit
the loop in the next round. So this change is not a bugfix (since the old
code should still run okay iiuc), but we'd better still touch it up to
make it logically sane.
Link: https://lkml.kernel.org/r/20210217233547.93892-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Gal Pressman <galpress@amazon.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Wei Zhang <wzam@amazon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/hugetlb.c~hugetlg-break-earlier-in-add_reservation_in_range-when-we-can
+++ a/mm/hugetlb.c
@@ -387,7 +387,7 @@ static long add_reservation_in_range(str
/* When we find a region that starts beyond our range, we've
* finished.
*/
- if (rg->from > t)
+ if (rg->from >= t)
break;
/* Add an entry for last_accounted_offset -> rg->from, and
_
next prev parent reply other threads:[~2021-03-13 5:08 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-13 5:06 incoming Andrew Morton
2021-03-13 5:07 ` [patch 01/29] memblock: fix section mismatch warning Andrew Morton
2021-03-13 5:07 ` [patch 02/29] stop_machine: mark helpers __always_inline Andrew Morton
2021-03-13 5:07 ` [patch 03/29] init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM Andrew Morton
2021-03-13 5:07 ` [patch 04/29] mm/page_alloc.c: refactor initialization of struct page for holes in memory layout Andrew Morton
2021-03-13 5:07 ` [patch 05/29] mm/fork: clear PASID for new mm Andrew Morton
2021-03-13 5:07 ` [patch 06/29] hugetlb: dedup the code to add a new file_region Andrew Morton
2021-03-13 5:07 ` Andrew Morton [this message]
2021-03-13 5:07 ` [patch 08/29] mm: introduce page_needs_cow_for_dma() for deciding whether cow Andrew Morton
2021-03-13 5:07 ` [patch 09/29] mm: use is_cow_mapping() across tree where proper Andrew Morton
2021-03-13 5:07 ` [patch 10/29] hugetlb: do early cow when page pinned on src mm Andrew Morton
2021-03-13 5:07 ` [patch 11/29] mm/highmem.c: fix zero_user_segments() with start > end Andrew Morton
2021-03-13 5:07 ` [patch 12/29] binfmt_misc: fix possible deadlock in bm_register_write Andrew Morton
2021-03-13 5:07 ` [patch 13/29] MAINTAINERS: exclude uapi directories in API/ABI section Andrew Morton
2021-03-13 5:07 ` [patch 14/29] linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP* Andrew Morton
2021-03-13 5:07 ` [patch 15/29] kfence: fix printk format for ptrdiff_t Andrew Morton
2021-03-13 5:07 ` [patch 16/29] kfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations Andrew Morton
2021-03-13 5:08 ` [patch 17/29] kfence: fix reports if constant function prefixes exist Andrew Morton
2021-03-13 5:08 ` [patch 18/29] include/linux/sched/mm.h: use rcu_dereference in in_vfork() Andrew Morton
2021-03-13 5:08 ` [patch 19/29] mm/madvise: replace ptrace attach requirement for process_madvise Andrew Morton
2021-03-13 5:08 ` [patch 20/29] kasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC Andrew Morton
2021-03-13 5:08 ` [patch 21/29] kasan: fix KASAN_STACK dependency for HW_TAGS Andrew Morton
2021-03-13 5:08 ` [patch 22/29] mm/userfaultfd: fix memory corruption due to writeprotect Andrew Morton
2021-03-13 5:08 ` [patch 23/29] mm, hwpoison: do not lock page again when me_huge_page() successfully recovers Andrew Morton
2021-03-13 19:23 ` Linus Torvalds
2021-03-14 6:36 ` HORIGUCHI NAOYA(堀口 直也)
2021-03-13 5:08 ` [patch 24/29] ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls Andrew Morton
2021-03-13 5:08 ` [patch 25/29] ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign Andrew Morton
2021-03-13 5:08 ` [patch 26/29] mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument Andrew Morton
2021-03-13 5:08 ` [patch 27/29] mm/memcg: set memcg when splitting page Andrew Morton
2021-03-13 5:08 ` [patch 28/29] zram: fix return value on writeback_store Andrew Morton
2021-03-13 5:08 ` [patch 29/29] zram: fix broken page writeback Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210313050722.nUfetTcPM%akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=aarcange@redhat.com \
--cc=adobriyan@gmail.com \
--cc=airlied@linux.ie \
--cc=daniel@ffwll.ch \
--cc=david@gibson.dropbear.id.au \
--cc=galpress@amazon.com \
--cc=hch@lst.de \
--cc=jack@suse.cz \
--cc=jannh@google.com \
--cc=jgg@ziepe.ca \
--cc=kirill@shutemov.name \
--cc=ktkhai@virtuozzo.com \
--cc=linmiaohe@huawei.com \
--cc=linux-graphics-maintainer@vmware.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mike.kravetz@oracle.com \
--cc=mm-commits@vger.kernel.org \
--cc=peterx@redhat.com \
--cc=rppt@linux.vnet.ibm.com \
--cc=sroland@vmware.com \
--cc=torvalds@linux-foundation.org \
--cc=willy@infradead.org \
--cc=wzam@amazon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).