From: Nadav Amit <nadav.amit@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Nadav Amit <namit@vmware.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Yu Zhao <yuzhao@google.com>,
Nick Piggin <npiggin@gmail.com>,
x86@kernel.org
Subject: [RFC 04/20] mm/mapping_dirty_helpers: use mmu_gather
Date: Sat, 30 Jan 2021 16:11:16 -0800 [thread overview]
Message-ID: <20210131001132.3368247-5-namit@vmware.com> (raw)
In-Reply-To: <20210131001132.3368247-1-namit@vmware.com>
From: Nadav Amit <namit@vmware.com>
Avoid open-coding mmu_gather for no reason. There is no apparent reason
not to use the existing mmu_gather interfaces.
Use the newly introduced pte_may_need_flush() to check whether a flush
is needed to avoid unnecassary flushes.
Signed-off-by: Nadav Amit <namit@vmware.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Nick Piggin <npiggin@gmail.com>
Cc: x86@kernel.org
---
mm/mapping_dirty_helpers.c | 37 +++++++++++--------------------------
1 file changed, 11 insertions(+), 26 deletions(-)
diff --git a/mm/mapping_dirty_helpers.c b/mm/mapping_dirty_helpers.c
index b59054ef2e10..2ce6cf431026 100644
--- a/mm/mapping_dirty_helpers.c
+++ b/mm/mapping_dirty_helpers.c
@@ -4,7 +4,7 @@
#include <linux/bitops.h>
#include <linux/mmu_notifier.h>
#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
+#include <asm/tlb.h>
/**
* struct wp_walk - Private struct for pagetable walk callbacks
@@ -15,8 +15,7 @@
*/
struct wp_walk {
struct mmu_notifier_range range;
- unsigned long tlbflush_start;
- unsigned long tlbflush_end;
+ struct mmu_gather tlb;
unsigned long total;
};
@@ -42,9 +41,9 @@ static int wp_pte(pte_t *pte, unsigned long addr, unsigned long end,
ptent = pte_wrprotect(old_pte);
ptep_modify_prot_commit(walk->vma, addr, pte, old_pte, ptent);
wpwalk->total++;
- wpwalk->tlbflush_start = min(wpwalk->tlbflush_start, addr);
- wpwalk->tlbflush_end = max(wpwalk->tlbflush_end,
- addr + PAGE_SIZE);
+
+ if (pte_may_need_flush(old_pte, ptent))
+ tlb_flush_pte_range(&wpwalk->tlb, addr, PAGE_SIZE);
}
return 0;
@@ -101,9 +100,7 @@ static int clean_record_pte(pte_t *pte, unsigned long addr,
ptep_modify_prot_commit(walk->vma, addr, pte, old_pte, ptent);
wpwalk->total++;
- wpwalk->tlbflush_start = min(wpwalk->tlbflush_start, addr);
- wpwalk->tlbflush_end = max(wpwalk->tlbflush_end,
- addr + PAGE_SIZE);
+ tlb_flush_pte_range(&wpwalk->tlb, addr, PAGE_SIZE);
__set_bit(pgoff, cwalk->bitmap);
cwalk->start = min(cwalk->start, pgoff);
@@ -184,20 +181,13 @@ static int wp_clean_pre_vma(unsigned long start, unsigned long end,
{
struct wp_walk *wpwalk = walk->private;
- wpwalk->tlbflush_start = end;
- wpwalk->tlbflush_end = start;
-
mmu_notifier_range_init(&wpwalk->range, MMU_NOTIFY_PROTECTION_PAGE, 0,
walk->vma, walk->mm, start, end);
mmu_notifier_invalidate_range_start(&wpwalk->range);
flush_cache_range(walk->vma, start, end);
- /*
- * We're not using tlb_gather_mmu() since typically
- * only a small subrange of PTEs are affected, whereas
- * tlb_gather_mmu() records the full range.
- */
- inc_tlb_flush_pending(walk->mm);
+ tlb_gather_mmu(&wpwalk->tlb, walk->mm);
+ tlb_start_vma(&wpwalk->tlb, walk->vma);
return 0;
}
@@ -212,15 +202,10 @@ static void wp_clean_post_vma(struct mm_walk *walk)
{
struct wp_walk *wpwalk = walk->private;
- if (mm_tlb_flush_nested(walk->mm))
- flush_tlb_range(walk->vma, wpwalk->range.start,
- wpwalk->range.end);
- else if (wpwalk->tlbflush_end > wpwalk->tlbflush_start)
- flush_tlb_range(walk->vma, wpwalk->tlbflush_start,
- wpwalk->tlbflush_end);
-
mmu_notifier_invalidate_range_end(&wpwalk->range);
- dec_tlb_flush_pending(walk->mm);
+
+ tlb_end_vma(&wpwalk->tlb, walk->vma);
+ tlb_finish_mmu(&wpwalk->tlb);
}
/*
--
2.25.1
next prev parent reply other threads:[~2021-01-31 0:17 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-31 0:11 [RFC 00/20] TLB batching consolidation and enhancements Nadav Amit
2021-01-31 0:11 ` [RFC 01/20] mm/tlb: fix fullmm semantics Nadav Amit
2021-01-31 1:02 ` Andy Lutomirski
2021-01-31 1:19 ` Nadav Amit
2021-01-31 2:57 ` Andy Lutomirski
2021-02-01 7:30 ` Nadav Amit
2021-02-01 11:36 ` Peter Zijlstra
2021-02-02 9:32 ` Nadav Amit
2021-02-02 11:00 ` Peter Zijlstra
2021-02-02 21:35 ` Nadav Amit
2021-02-03 9:44 ` Will Deacon
2021-02-04 3:20 ` Nadav Amit
2021-01-31 0:11 ` [RFC 02/20] mm/mprotect: use mmu_gather Nadav Amit
2021-01-31 0:11 ` [RFC 03/20] mm/mprotect: do not flush on permission promotion Nadav Amit
2021-01-31 1:07 ` Andy Lutomirski
2021-01-31 1:17 ` Nadav Amit
2021-01-31 2:59 ` Andy Lutomirski
[not found] ` <7a6de15a-a570-31f2-14d6-a8010296e694@citrix.com>
2021-02-01 5:58 ` Nadav Amit
2021-02-01 15:38 ` Andrew Cooper
2021-01-31 0:11 ` Nadav Amit [this message]
2021-01-31 0:11 ` [RFC 05/20] mm/tlb: move BATCHED_UNMAP_TLB_FLUSH to tlb.h Nadav Amit
2021-01-31 0:11 ` [RFC 06/20] fs/task_mmu: use mmu_gather interface of clear-soft-dirty Nadav Amit
2021-01-31 0:11 ` [RFC 07/20] mm: move x86 tlb_gen to generic code Nadav Amit
2021-01-31 18:26 ` Andy Lutomirski
2021-01-31 0:11 ` [RFC 08/20] mm: store completed TLB generation Nadav Amit
2021-01-31 20:32 ` Andy Lutomirski
2021-02-01 7:28 ` Nadav Amit
2021-02-01 16:53 ` Andy Lutomirski
2021-02-01 11:52 ` Peter Zijlstra
2021-01-31 0:11 ` [RFC 09/20] mm: create pte/pmd_tlb_flush_pending() Nadav Amit
2021-01-31 0:11 ` [RFC 10/20] mm: add pte_to_page() Nadav Amit
2021-01-31 0:11 ` [RFC 11/20] mm/tlb: remove arch-specific tlb_start/end_vma() Nadav Amit
2021-02-01 12:09 ` Peter Zijlstra
2021-02-02 6:41 ` Nicholas Piggin
2021-02-02 7:20 ` Nadav Amit
2021-02-02 9:31 ` Peter Zijlstra
2021-02-02 9:54 ` Nadav Amit
2021-02-02 11:04 ` Peter Zijlstra
2021-01-31 0:11 ` [RFC 12/20] mm/tlb: save the VMA that is flushed during tlb_start_vma() Nadav Amit
2021-02-01 12:28 ` Peter Zijlstra
2021-01-31 0:11 ` [RFC 13/20] mm/tlb: introduce tlb_start_ptes() and tlb_end_ptes() Nadav Amit
[not found] ` <YBaBcc2jEGaxuxH0@fedora.tometzki.de>
2021-02-01 7:29 ` Nadav Amit
2021-02-01 13:19 ` Peter Zijlstra
2021-02-01 23:00 ` Nadav Amit
2021-01-31 0:11 ` [RFC 14/20] mm: move inc/dec_tlb_flush_pending() to mmu_gather.c Nadav Amit
2021-01-31 0:11 ` [RFC 15/20] mm: detect deferred TLB flushes in vma granularity Nadav Amit
2021-02-01 22:04 ` Nadav Amit
2021-02-02 0:14 ` Andy Lutomirski
2021-02-02 20:51 ` Nadav Amit
2021-02-04 4:35 ` Andy Lutomirski
2021-01-31 0:11 ` [RFC 16/20] mm/tlb: per-page table generation tracking Nadav Amit
2021-01-31 0:11 ` [RFC 17/20] mm/tlb: updated completed deferred TLB flush conditionally Nadav Amit
2021-01-31 0:11 ` [RFC 18/20] mm: make mm_cpumask() volatile Nadav Amit
2021-01-31 0:11 ` [RFC 19/20] lib/cpumask: introduce cpumask_atomic_or() Nadav Amit
2021-01-31 0:11 ` [RFC 20/20] mm/rmap: avoid potential races Nadav Amit
2021-08-23 8:05 ` Huang, Ying
2021-08-23 15:50 ` Nadav Amit
2021-08-24 0:36 ` Huang, Ying
2021-01-31 0:39 ` [RFC 00/20] TLB batching consolidation and enhancements Andy Lutomirski
2021-01-31 1:08 ` Nadav Amit
2021-01-31 3:30 ` Nicholas Piggin
2021-01-31 7:57 ` Nadav Amit
2021-01-31 8:14 ` Nadav Amit
2021-02-01 12:44 ` Peter Zijlstra
2021-02-02 7:14 ` Nicholas Piggin
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