Linux-mm Archive on lore.kernel.org
 help / color / Atom feed
From: Nadav Amit <namit@vmware.com>
To: linux-mm@kvack.org
Cc: nadav.amit@gmail.com, linux-kernel@vger.kernel.org,
	akpm@linux-foundation.org, Minchan Kim <minchan@kernel.org>,
	Nadav Amit <namit@vmware.com>
Subject: [PATCH v6 5/7] mm: make tlb_flush_pending global
Date: Tue, 1 Aug 2017 17:08:16 -0700
Message-ID: <20170802000818.4760-6-namit@vmware.com> (raw)
In-Reply-To: <20170802000818.4760-1-namit@vmware.com>

From: Minchan Kim <minchan@kernel.org>

Currently, tlb_flush_pending is used only for CONFIG_[NUMA_BALANCING|
COMPACTION] but upcoming patches to solve subtle TLB flush batching
problem will use it regardless of compaction/NUMA so this patch
doesn't remove the dependency.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Nadav Amit <namit@vmware.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
---
 include/linux/mm_types.h | 21 ---------------------
 mm/debug.c               |  2 --
 2 files changed, 23 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 248f4ed1f3e1..fc44315df47a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -487,14 +487,12 @@ struct mm_struct {
 	/* numa_scan_seq prevents two threads setting pte_numa */
 	int numa_scan_seq;
 #endif
-#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 	/*
 	 * An operation with batched TLB flushing is going on. Anything that
 	 * can move process memory needs to flush the TLB when moving a
 	 * PROT_NONE or PROT_NUMA mapped page.
 	 */
 	atomic_t tlb_flush_pending;
-#endif
 	struct uprobes_state uprobes_state;
 #ifdef CONFIG_HUGETLB_PAGE
 	atomic_long_t hugetlb_usage;
@@ -524,7 +522,6 @@ extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
 extern void tlb_finish_mmu(struct mmu_gather *tlb,
 				unsigned long start, unsigned long end);
 
-#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 /*
  * Memory barriers to keep this state in sync are graciously provided by
  * the page table locks, outside of which no page table modifications happen.
@@ -565,24 +562,6 @@ static inline void dec_tlb_flush_pending(struct mm_struct *mm)
 	smp_mb__before_atomic();
 	atomic_dec(&mm->tlb_flush_pending);
 }
-#else
-static inline bool mm_tlb_flush_pending(struct mm_struct *mm)
-{
-	return false;
-}
-
-static inline void init_tlb_flush_pending(struct mm_struct *mm)
-{
-}
-
-static inline void inc_tlb_flush_pending(struct mm_struct *mm)
-{
-}
-
-static inline void dec_tlb_flush_pending(struct mm_struct *mm)
-{
-}
-#endif
 
 struct vm_fault;
 
diff --git a/mm/debug.c b/mm/debug.c
index d70103bb4731..18a9b15b1e37 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -158,9 +158,7 @@ void dump_mm(const struct mm_struct *mm)
 #ifdef CONFIG_NUMA_BALANCING
 		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 #endif
-#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 		atomic_read(&mm->tlb_flush_pending),
-#endif
 		mm->def_flags, &mm->def_flags
 	);
 }
-- 
2.11.0

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  parent reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-02  0:08 [PATCH v6 0/7] fixes of TLB batching races Nadav Amit
2017-08-02  0:08 ` [PATCH v6 1/7] mm: migrate: prevent racy access to tlb_flush_pending Nadav Amit
2017-08-02  0:08 ` [PATCH v6 2/7] mm: migrate: fix barriers around tlb_flush_pending Nadav Amit
2017-08-02  0:08 ` [PATCH v6 3/7] Revert "mm: numa: defer TLB flush for THP migration as long as possible" Nadav Amit
2017-08-11 10:50   ` Peter Zijlstra
2017-08-02  0:08 ` [PATCH v6 4/7] mm: refactoring TLB gathering API Nadav Amit
2017-08-11  9:23   ` Peter Zijlstra
2017-08-11 17:12     ` Nadav Amit
2017-08-14  0:49       ` Minchan Kim
2017-08-02  0:08 ` Nadav Amit [this message]
2017-08-02 14:28   ` [PATCH v6 5/7] mm: make tlb_flush_pending global kbuild test robot
2017-08-02 23:23     ` Minchan Kim
2017-08-02 23:27     ` Andrew Morton
2017-08-02 23:34       ` Minchan Kim
2017-08-03 16:40   ` kbuild test robot
2017-08-02  0:08 ` [PATCH v6 6/7] mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem Nadav Amit
2017-08-08  1:19   ` [lkp-robot] [mm] 7674270022: will-it-scale.per_process_ops -19.3% regression kernel test robot
2017-08-08  2:28     ` Minchan Kim
2017-08-08  4:23       ` Nadav Amit
2017-08-08  5:51         ` Nadav Amit
2017-08-08  8:08           ` Minchan Kim
2017-08-08  8:16             ` Nadav Amit
2017-08-09  1:25             ` Ye Xiaolong
2017-08-09  2:59             ` Ye Xiaolong
2017-08-10  4:13               ` Minchan Kim
2017-08-10  4:14                 ` Nadav Amit
2017-08-10  4:20                   ` Minchan Kim
2017-08-11 13:30   ` [PATCH v6 6/7] mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem Peter Zijlstra
2017-08-13  6:14     ` Nadav Amit
2017-08-13 12:08       ` Peter Zijlstra
2017-08-14  1:26     ` Minchan Kim
2017-08-02  0:08 ` [PATCH v6 7/7] mm: fix KSM data corruption Nadav Amit
2017-08-02 23:26 ` [PATCH v6 0/7] fixes of TLB batching races Minchan Kim

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=20170802000818.4760-6-namit@vmware.com \
    --to=namit@vmware.com \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=minchan@kernel.org \
    --cc=nadav.amit@gmail.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

Linux-mm Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
		linux-mm@kvack.org
	public-inbox-index linux-mm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kvack.linux-mm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git