From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andrea Arcangeli <aarcange@redhat.com>,
Avi Kivity <avi@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@elte.hu>,
akpm@linux-foundation.org,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
David Miller <davem@davemloft.net>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Mel Gorman <mel@csn.ul.ie>, Nick Piggin <npiggin@kernel.dk>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Yanmin Zhang <yanmin_zhang@linux.intel.com>
Subject: [PATCH 02/20] powerpc: mmu_gather rework
Date: Fri, 01 Apr 2011 14:13:00 +0200 [thread overview]
Message-ID: <20110401121725.414814402@chello.nl> (raw)
In-Reply-To: <20110401121258.211963744@chello.nl>
[-- Attachment #1: peter_zijlstra-powerpc-preemptible_mmu_gather.patch --]
[-- Type: text/plain, Size: 8137 bytes --]
Fix up powerpc to the new mmu_gather stuffs.
PPC has an extra batching queue to RCU free the actual pagetable
allocations, use the ARCH extentions for that for now.
For the ppc64_tlb_batch, which tracks the vaddrs to unhash from the
hardware hash-table, keep using per-cpu arrays but flush on context
switch and use a TLF bit to track the lazy_mmu state.
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
---
arch/powerpc/include/asm/pgalloc.h | 4 ++--
arch/powerpc/include/asm/thread_info.h | 2 ++
arch/powerpc/include/asm/tlb.h | 10 ++++++++++
arch/powerpc/kernel/process.c | 23 ++++++++++++++++++++++-
arch/powerpc/mm/pgtable.c | 14 ++++----------
arch/powerpc/mm/tlb_hash32.c | 2 +-
arch/powerpc/mm/tlb_hash64.c | 6 ++++--
arch/powerpc/mm/tlb_nohash.c | 2 +-
8 files changed, 46 insertions(+), 17 deletions(-)
Index: linux-2.6/arch/powerpc/include/asm/tlb.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/tlb.h
+++ linux-2.6/arch/powerpc/include/asm/tlb.h
@@ -28,6 +28,16 @@
#define tlb_start_vma(tlb, vma) do { } while (0)
#define tlb_end_vma(tlb, vma) do { } while (0)
+#define HAVE_ARCH_MMU_GATHER 1
+
+struct pte_freelist_batch;
+
+struct arch_mmu_gather {
+ struct pte_freelist_batch *batch;
+};
+
+#define ARCH_MMU_GATHER_INIT (struct arch_mmu_gather){ .batch = NULL, }
+
extern void tlb_flush(struct mmu_gather *tlb);
/* Get the generic bits... */
Index: linux-2.6/arch/powerpc/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/process.c
+++ linux-2.6/arch/powerpc/kernel/process.c
@@ -395,6 +395,9 @@ struct task_struct *__switch_to(struct t
struct thread_struct *new_thread, *old_thread;
unsigned long flags;
struct task_struct *last;
+#ifdef CONFIG_PPC_BOOK3S_64
+ struct ppc64_tlb_batch *batch;
+#endif
#ifdef CONFIG_SMP
/* avoid complexity of lazy save/restore of fpu
@@ -513,7 +516,17 @@ struct task_struct *__switch_to(struct t
old_thread->accum_tb += (current_tb - start_tb);
new_thread->start_tb = current_tb;
}
-#endif
+#endif /* CONFIG_PPC64 */
+
+#ifdef CONFIG_PPC_BOOK3S_64
+ batch = &__get_cpu_var(ppc64_tlb_batch);
+ if (batch->active) {
+ current_thread_info()->local_flags |= _TLF_LAZY_MMU;
+ if (batch->index)
+ __flush_tlb_pending(batch);
+ batch->active = 0;
+ }
+#endif /* CONFIG_PPC_BOOK3S_64 */
local_irq_save(flags);
@@ -528,6 +541,14 @@ struct task_struct *__switch_to(struct t
hard_irq_disable();
last = _switch(old_thread, new_thread);
+#ifdef CONFIG_PPC_BOOK3S_64
+ if (current_thread_info()->local_flags & _TLF_LAZY_MMU) {
+ current_thread_info()->local_flags &= ~_TLF_LAZY_MMU;
+ batch = &__get_cpu_var(ppc64_tlb_batch);
+ batch->active = 1;
+ }
+#endif /* CONFIG_PPC_BOOK3S_64 */
+
local_irq_restore(flags);
return last;
Index: linux-2.6/arch/powerpc/mm/pgtable.c
===================================================================
--- linux-2.6.orig/arch/powerpc/mm/pgtable.c
+++ linux-2.6/arch/powerpc/mm/pgtable.c
@@ -33,8 +33,6 @@
#include "mmu_decl.h"
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
#ifdef CONFIG_SMP
/*
@@ -43,7 +41,6 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_ga
* freeing a page table page that is being walked without locks
*/
-static DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);
static unsigned long pte_freelist_forced_free;
struct pte_freelist_batch
@@ -97,12 +94,10 @@ static void pte_free_submit(struct pte_f
void pgtable_free_tlb(struct mmu_gather *tlb, void *table, unsigned shift)
{
- /* This is safe since tlb_gather_mmu has disabled preemption */
- struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
+ struct pte_freelist_batch **batchp = &tlb->arch.batch;
unsigned long pgf;
- if (atomic_read(&tlb->mm->mm_users) < 2 ||
- cpumask_equal(mm_cpumask(tlb->mm), cpumask_of(smp_processor_id()))){
+ if (atomic_read(&tlb->mm->mm_users) < 2) {
pgtable_free(table, shift);
return;
}
@@ -124,10 +119,9 @@ void pgtable_free_tlb(struct mmu_gather
}
}
-void pte_free_finish(void)
+void pte_free_finish(struct mmu_gather *tlb)
{
- /* This is safe since tlb_gather_mmu has disabled preemption */
- struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur);
+ struct pte_freelist_batch **batchp = &tlb->arch.batch;
if (*batchp == NULL)
return;
Index: linux-2.6/arch/powerpc/include/asm/thread_info.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/thread_info.h
+++ linux-2.6/arch/powerpc/include/asm/thread_info.h
@@ -139,10 +139,12 @@ static inline struct thread_info *curren
#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
+#define TLF_LAZY_MMU 3 /* tlb_batch is active */
#define _TLF_NAPPING (1 << TLF_NAPPING)
#define _TLF_SLEEPING (1 << TLF_SLEEPING)
#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
+#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
Index: linux-2.6/arch/powerpc/include/asm/pgalloc.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/pgalloc.h
+++ linux-2.6/arch/powerpc/include/asm/pgalloc.h
@@ -32,13 +32,13 @@ static inline void pte_free(struct mm_st
#ifdef CONFIG_SMP
extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, unsigned shift);
-extern void pte_free_finish(void);
+extern void pte_free_finish(struct mmu_gather *tlb);
#else /* CONFIG_SMP */
static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, unsigned shift)
{
pgtable_free(table, shift);
}
-static inline void pte_free_finish(void) { }
+static inline void pte_free_finish(struct mmu_gather *tlb) { }
#endif /* !CONFIG_SMP */
static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
Index: linux-2.6/arch/powerpc/mm/tlb_hash32.c
===================================================================
--- linux-2.6.orig/arch/powerpc/mm/tlb_hash32.c
+++ linux-2.6/arch/powerpc/mm/tlb_hash32.c
@@ -73,7 +73,7 @@ void tlb_flush(struct mmu_gather *tlb)
}
/* Push out batch of freed page tables */
- pte_free_finish();
+ pte_free_finish(tlb);
}
/*
Index: linux-2.6/arch/powerpc/mm/tlb_nohash.c
===================================================================
--- linux-2.6.orig/arch/powerpc/mm/tlb_nohash.c
+++ linux-2.6/arch/powerpc/mm/tlb_nohash.c
@@ -301,7 +301,7 @@ void tlb_flush(struct mmu_gather *tlb)
flush_tlb_mm(tlb->mm);
/* Push out batch of freed page tables */
- pte_free_finish();
+ pte_free_finish(tlb);
}
/*
Index: linux-2.6/arch/powerpc/mm/tlb_hash64.c
===================================================================
--- linux-2.6.orig/arch/powerpc/mm/tlb_hash64.c
+++ linux-2.6/arch/powerpc/mm/tlb_hash64.c
@@ -155,7 +155,7 @@ void __flush_tlb_pending(struct ppc64_tl
void tlb_flush(struct mmu_gather *tlb)
{
- struct ppc64_tlb_batch *tlbbatch = &__get_cpu_var(ppc64_tlb_batch);
+ struct ppc64_tlb_batch *tlbbatch = &get_cpu_var(ppc64_tlb_batch);
/* If there's a TLB batch pending, then we must flush it because the
* pages are going to be freed and we really don't want to have a CPU
@@ -164,8 +164,10 @@ void tlb_flush(struct mmu_gather *tlb)
if (tlbbatch->index)
__flush_tlb_pending(tlbbatch);
+ put_cpu_var(ppc64_tlb_batch);
+
/* Push out batch of freed page tables */
- pte_free_finish();
+ pte_free_finish(tlb);
}
/**
--
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next prev parent reply other threads:[~2011-04-01 13:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-01 12:12 [PATCH 00/20] mm: Preemptibility -v10 Peter Zijlstra
2011-04-01 12:12 ` [PATCH 01/20] mm: mmu_gather rework Peter Zijlstra
2011-04-19 20:06 ` Andrew Morton
2011-04-20 8:47 ` Peter Zijlstra
2011-04-20 9:10 ` Peter Zijlstra
2011-04-01 12:13 ` Peter Zijlstra [this message]
2011-04-01 12:13 ` [PATCH 03/20] sparc: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 04/20] s390: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 05/20] arm: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 06/20] sh: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 07/20] ia64: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 08/20] um: " Peter Zijlstra
2011-04-01 12:13 ` [PATCH 09/20] mm: Now that all old mmu_gather code is gone, remove the storage Peter Zijlstra
2011-04-01 12:13 ` [PATCH 10/20] mm, powerpc: Move the RCU page-table freeing into generic code Peter Zijlstra
2011-04-01 12:13 ` [PATCH 11/20] s390: use generic RCP page-table freeing Peter Zijlstra
2011-04-01 12:13 ` [PATCH 12/20] mm: Extended batches for generic mmu_gather Peter Zijlstra
2011-04-19 20:06 ` Andrew Morton
2011-04-20 10:40 ` Peter Zijlstra
2011-04-01 12:13 ` [PATCH 13/20] lockdep, mutex: Provide mutex_lock_nest_lock Peter Zijlstra
2011-04-19 20:06 ` Andrew Morton
2011-04-20 11:03 ` Peter Zijlstra
2011-04-01 12:13 ` [PATCH 14/20] mm: Remove i_mmap_lock lockbreak Peter Zijlstra
2011-04-19 20:07 ` Andrew Morton
2011-04-21 13:32 ` Peter Zijlstra
2011-04-01 12:13 ` [PATCH 15/20] mm: Convert i_mmap_lock to a mutex Peter Zijlstra
2011-04-19 20:07 ` Andrew Morton
2011-04-21 13:28 ` Peter Zijlstra
2011-04-01 12:13 ` [PATCH 16/20] mm: Revert page_lock_anon_vma() lock annotation Peter Zijlstra
2011-04-01 12:13 ` [PATCH 17/20] mm: Improve page_lock_anon_vma() comment Peter Zijlstra
2011-04-01 12:13 ` [PATCH 18/20] mm: Use refcounts for page_lock_anon_vma() Peter Zijlstra
2011-04-01 12:13 ` [PATCH 19/20] mm: Convert anon_vma->lock to a mutex Peter Zijlstra
2011-04-19 20:07 ` Andrew Morton
2011-04-21 13:28 ` Peter Zijlstra
2011-04-01 12:13 ` [PATCH 20/20] mm: Optimize page_lock_anon_vma() fast-path Peter Zijlstra
2011-04-19 20:08 ` Andrew Morton
2011-04-20 12:38 ` Peter Zijlstra
2011-04-20 15:00 ` Peter Zijlstra
2011-04-01 13:51 ` [PATCH 00/20] mm: Preemptibility -v10 Peter Zijlstra
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