From: Stefan Roesch <shr@devkernel.io>
To: linux-mm@kvack.org
Cc: shr@devkernel.io, linux-doc@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org,
linux-trace-kernel@vger.kernel.org
Subject: [RESEND RFC PATCH v1 03/20] mm: add flag to __ksm_exit call
Date: Mon, 23 Jan 2023 09:37:31 -0800 [thread overview]
Message-ID: <20230123173748.1734238-4-shr@devkernel.io> (raw)
In-Reply-To: <20230123173748.1734238-1-shr@devkernel.io>
This adds the flag parameter to the __ksm_exit() call. This allows to
distinguish if this call is for an prctl or madvise invocation.
Signed-off-by: Stefan Roesch <shr@devkernel.io>
---
include/linux/ksm.h | 8 +++++---
mm/ksm.c | 8 ++++++--
2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index 50e6b56092f3..d38a05a36298 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -18,8 +18,8 @@
#ifdef CONFIG_KSM
int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
unsigned long end, int advice, unsigned long *vm_flags);
-void __ksm_exit(struct mm_struct *mm);
int __ksm_enter(struct mm_struct *mm, int flag);
+void __ksm_exit(struct mm_struct *mm, int flag);
static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
{
@@ -32,8 +32,10 @@ static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
static inline void ksm_exit(struct mm_struct *mm)
{
- if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
- __ksm_exit(mm);
+ if (test_bit(MMF_VM_MERGE_ANY, &mm->flags))
+ __ksm_exit(mm, MMF_VM_MERGE_ANY);
+ else if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
+ __ksm_exit(mm, MMF_VM_MERGEABLE);
}
/*
diff --git a/mm/ksm.c b/mm/ksm.c
index d84a244fe224..83796328574c 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2563,12 +2563,16 @@ int __ksm_enter(struct mm_struct *mm, int flag)
return 0;
}
-void __ksm_exit(struct mm_struct *mm)
+void __ksm_exit(struct mm_struct *mm, int flag)
{
struct ksm_mm_slot *mm_slot;
struct mm_slot *slot;
int easy_to_free = 0;
+ if (!(current->flags & PF_EXITING) && flag == MMF_VM_MERGE_ANY &&
+ test_bit(MMF_VM_MERGE_ANY, &mm->flags))
+ clear_bit(MMF_VM_MERGE_ANY, &mm->flags);
+
/*
* This process is exiting: if it's straightforward (as is the
* case when ksmd was never running), free mm_slot immediately.
@@ -2595,7 +2599,7 @@ void __ksm_exit(struct mm_struct *mm)
if (easy_to_free) {
mm_slot_free(mm_slot_cache, mm_slot);
- clear_bit(MMF_VM_MERGEABLE, &mm->flags);
+ clear_bit(flag, &mm->flags);
mmdrop(mm);
} else if (mm_slot) {
mmap_write_lock(mm);
--
2.30.2
next prev parent reply other threads:[~2023-01-23 17:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-23 17:37 [RESEND RFC PATCH v1 00/20] mm: process/cgroup ksm support Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 01/20] mm: add new flag to enable ksm per process Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 02/20] mm: add flag to __ksm_enter Stefan Roesch
2023-01-23 17:37 ` Stefan Roesch [this message]
2023-01-23 17:37 ` [RESEND RFC PATCH v1 04/20] mm: invoke madvise for all vmas in scan_get_next_rmap_item Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 05/20] mm: support disabling of ksm for a process Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 06/20] mm: add new prctl option to get and set " Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 07/20] mm: add tracepoints to ksm Stefan Roesch
2023-01-30 17:03 ` Steven Rostedt
2023-01-23 17:37 ` [RESEND RFC PATCH v1 08/20] mm: split off pages_volatile function Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 09/20] mm: expose general_profit metric Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 10/20] docs: document general_profit sysfs knob Stefan Roesch
2023-01-24 4:07 ` Bagas Sanjaya
2023-01-24 16:21 ` Jonathan Corbet
2023-01-26 2:31 ` Bagas Sanjaya
2023-01-23 17:37 ` [RESEND RFC PATCH v1 11/20] mm: calculate ksm process profit metric Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 12/20] mm: add ksm_merge_type() function Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 13/20] mm: expose ksm process profit metric in ksm_stat Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 14/20] mm: expose ksm merge type " Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 15/20] docs: document new procfs ksm knobs Stefan Roesch
2023-01-24 4:09 ` Bagas Sanjaya
2023-01-23 17:37 ` [RESEND RFC PATCH v1 16/20] tools: add new prctl flags to prctl in tools dir Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 17/20] selftests/vm: add KSM prctl merge test Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 18/20] selftests/vm: add KSM get merge type test Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 19/20] selftests/vm: add KSM fork test Stefan Roesch
2023-01-23 17:37 ` [RESEND RFC PATCH v1 20/20] selftests/vm: add two functions for debugging merge outcome Stefan Roesch
2023-01-24 16:38 ` [RESEND RFC PATCH v1 00/20] mm: process/cgroup ksm support David Hildenbrand
2023-01-24 17:37 ` Stefan Roesch
2023-01-24 18:01 ` David Hildenbrand
2023-01-25 13:01 ` Michal Hocko
2023-01-25 18:43 ` Rik van Riel
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