From: Stefan Roesch <shr@devkernel.io>
To: kernel-team@fb.com
Cc: shr@devkernel.io, linux-mm@kvack.org, riel@surriel.com,
mhocko@suse.com, david@redhat.com,
linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org,
akpm@linux-foundation.org
Subject: [RFC PATCH v2 03/19] mm: add flag to __ksm_exit call
Date: Fri, 10 Feb 2023 13:50:07 -0800 [thread overview]
Message-ID: <20230210215023.2740545-4-shr@devkernel.io> (raw)
In-Reply-To: <20230210215023.2740545-1-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 afc0980592af..3597ae52fe7b 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2665,12 +2665,16 @@ 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.
@@ -2697,7 +2701,7 @@ 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:[~2023-02-10 21:50 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-10 21:50 [RFC PATCH v2 00/19] mm: process/cgroup ksm support Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 01/19] mm: add new flag to enable ksm per process Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 02/19] mm: add flag to __ksm_enter Stefan Roesch
2023-02-10 21:50 ` Stefan Roesch [this message]
2023-02-10 21:50 ` [RFC PATCH v2 04/19] mm: invoke madvise for all vmas in scan_get_next_rmap_item Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 05/19] mm: support disabling of ksm for a process Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 06/19] mm: add new prctl option to get and set " Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 07/19] mm: split off pages_volatile function Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 08/19] mm: expose general_profit metric Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 09/19] docs: document general_profit sysfs knob Stefan Roesch
2023-02-11 8:17 ` Bagas Sanjaya
2023-02-15 23:00 ` Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 10/19] mm: calculate ksm process profit metric Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 11/19] mm: add ksm_merge_type() function Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 12/19] mm: expose ksm process profit metric in ksm_stat Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 13/19] mm: expose ksm merge type " Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 14/19] docs: document new procfs ksm knobs Stefan Roesch
2023-02-11 8:18 ` Bagas Sanjaya
2023-02-10 21:50 ` [RFC PATCH v2 15/19] tools: add new prctl flags to prctl in tools dir Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 16/19] selftests/vm: add KSM prctl merge test Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 17/19] selftests/vm: add KSM get merge type test Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 18/19] selftests/vm: add KSM fork test Stefan Roesch
2023-02-10 21:50 ` [RFC PATCH v2 19/19] selftests/vm: add two functions for debugging merge outcome Stefan Roesch
2023-02-10 23:23 ` [RFC PATCH v2 00/19] mm: process/cgroup ksm support Matthew Wilcox
2023-02-11 2:41 ` Rik van Riel
2023-02-21 16:10 ` Johannes Weiner
2023-02-21 17:59 ` Stefan Roesch
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