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Thu, 20 Jun 2024 04:39:20 +0000 (GMT) Received: from epsmgms1p2new.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20240620043920epsmtrp25c2610d0f9fa9b649d81f8065ccc1ad6~anJJRFfMg1486114861epsmtrp22; Thu, 20 Jun 2024 04:39:20 +0000 (GMT) X-AuditID: b6c32a36-60dff70000002677-70-6673b27887ab Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2new.samsung.com (Symantec Messaging Gateway) with SMTP id A1.CA.19057.772B3766; Thu, 20 Jun 2024 13:39:19 +0900 (KST) Received: from localhost.localdomain (unknown [10.113.111.45]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20240620043919epsmtip13d55b576ec751cf51711cd170ca8be48~anJJA9xwC3203132031epsmtip1q; Thu, 20 Jun 2024 04:39:19 +0000 (GMT) From: Sung-hun Kim To: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: sungguk.na@samsung.com, sw0312.kim@samsung.com, sebuns@gmail.com, Sung-hun Kim Subject: [PATCH v2] mm: ksm: Consider the number of ksm_mm_slot in the general_profit calculation Date: Thu, 20 Jun 2024 13:39:14 +0900 Message-Id: <20240620043914.249768-1-sfoon.kim@samsung.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrMKsWRmVeSWpSXmKPExsWy7bCmnm7FpuI0g02tEhZz1q9hs7i8aw6b xb01/1ktmi+8ZLRonLac3WLHvIOMFjMmv2RzYPfYOesuu8emT5PYPU7M+M3i0bdlFaPH501y AaxR2TYZqYkpqUUKqXnJ+SmZeem2St7B8c7xpmYGhrqGlhbmSgp5ibmptkouPgG6bpk5QGco KZQl5pQChQISi4uV9O1sivJLS1IVMvKLS2yVUgtScgpMC/SKE3OLS/PS9fJSS6wMDQyMTIEK E7Iztl8IL9gpUXG9aRZTA+NWkS5GTg4JAROJB6vPsnQxcnEICexglPjRdYYRwvnEKPF0+ldm COcbo0TL22+MMC3/nz5jh0jsZZRo3HKHCcL5zChxomM2C0gVm4CWxLb9l8A6RAQCJS4u/MoK YjML5Ehs+T4RzBYWSJbo7GsBq2ERUJVYeLuRGcTmFbCWuLhnEdQ2eYmZl76zQ8QFJU7OfMIC MUdeonnrbLDzJAROsUs8vr+YCaLBReLrlAVsELawxKvjW9ghbCmJz+/2AsU5gOxqianPuSF6 Wxgl/r3czwpRYyyxf+lkJpAaZgFNifW79CF28Um8+9rDCtHKK9HRJgRRrSzx+GAzC4QtKfF1 33WoCzwkmn5vB7OFBGIlvq/5wDiBUW4Wkg9mIflgFsKyBYzMqxjFUguKc9NTiw0LjOARmZyf u4kRnPq0zHYwTnr7Qe8QIxMH4yFGCQ5mJRHe511FaUK8KYmVValF+fFFpTmpxYcYTYFhOpFZ SjQ5H5h880riDU0sDUzMjIxNLAzNDJXEec9cKUsVEkhPLEnNTk0tSC2C6WPi4JRqYLJPmvvi /t7fRUvy/Y5fEs/I2de/fNo1wSfl6XcWb6u/X6oWlhPd4nR3SdGERfdvtioHWy7wOf1cjKXw WIBEw3YelhkTZ066/qPkn9qKZ6tzwv7P38bD05D/0nP1lOL9HFNm3WeRPHwlv/Ls3QmbvLyP //y39ObnK3U5k9YbzC3j3nLKeLdx/ru6F55+LlrfH25jbRXwNz/6oDfWdP30+ssXZ1kvtuvx kSrnS5yS11V/5GvQNb8btb9lhF769K/eKqFwRG/ytHU66bVyVia3J8n8Enm+8M9adQ7rk7du nRF2DG91mHf7jHyg07czbWFzAu36GfifXto2N7W77bSg6mX/B+fOTH6lwFyWbHhS/VOjEktx RqKhFnNRcSIAGdmrTQYEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLLMWRmVeSWpSXmKPExsWy7bCSnG75puI0gy/LzCzmrF/DZnF51xw2 i3tr/rNaNF94yWjROG05u8WOeQcZLWZMfsnmwO6xc9Zddo9Nnyaxe5yY8ZvFo2/LKkaPz5vk AlijuGxSUnMyy1KL9O0SuDK2Xwgv2ClRcb1pFlMD41aRLkZODgkBE4n/T5+xdzFycQgJ7GaU 6HgylxkiISkxZ90Cxi5GDiBbWOLw4WKImo+MEhNn/GcDqWET0JLYtv8SI4gtIhAscWvTH7Be ZoECiVX7toDZwgKJEruf3AKrZxFQlVh4uxEszitgLXFxzyJGiF3yEjMvfWeHiAtKnJz5hAVi jrxE89bZzBMY+WYhSc1CklrAyLSKUTK1oDg3PbfYsMAoL7Vcrzgxt7g0L10vOT93EyM4RLW0 djDuWfVB7xAjEwfjIUYJDmYlEd7nXUVpQrwpiZVVqUX58UWlOanFhxilOViUxHm/ve5NERJI TyxJzU5NLUgtgskycXBKNTBN6egpln8ryy78RvWtwbzU5iqlKUoiWn4fWHhsC5eeEK2fcp21 OjzRmVvi57HKBc8jTWpX2Xiaxxn6s5tcczNVC3txoLLt26Pn34ycbA7HfS38kc909fbthXc3 LF1/MJKjOXD1c973s1+yuS+WKLTdfvk4x55oVfYH1lHeOX5OFzl/fJ54OqrlXuXy5Kzi8s8V 9e7Np1lnGe708vVQko2cmXhMtEVkktT3+If+AUapa7+WnHJds2ylUlzzCus1nOv1mJdGVbDu VnAOYjQufHaG3+cp+/wrx850r1aVunlA+NBGH19NPh7Nnaa2tV6Li6zyQtKlxWq6St6FxRiE tDmnLf+YMaWzPbX6R8NqJZbijERDLeai4kQAPhYIfMACAAA= X-CMS-MailID: 20240620043920epcas1p1b57dce789304aa96fd83e5b2b194d244 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240620043920epcas1p1b57dce789304aa96fd83e5b2b194d244 References: The current version of KSM does not take into account the number of used ksm_mm_slot. Therefore, when users want to obtain profits of KSM, KSM omits the memory used for allocating ksm_mm_slots. This patch introduces a new variable to keep track of the number of allocated ksm_mm_slots. By doing so, KSM will be able to provide a more accurate number of the gains made. Signed-off-by: Sung-hun Kim --- Changelog in V2: - Add an MMF_VM_MERGEABLE flag check in ksm_process_profit for untracked processes --- mm/ksm.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/mm/ksm.c b/mm/ksm.c index 34c4820e0d3d..c8ced991ccda 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -267,6 +267,9 @@ static unsigned long ksm_pages_unshared; /* The number of rmap_items in use: to calculate pages_volatile */ static unsigned long ksm_rmap_items; =20 +/* The number of ksm_mm_slot in use */ +static atomic_long_t ksm_mm_slots =3D ATOMIC_LONG_INIT(0); + /* The number of stable_node chains */ static unsigned long ksm_stable_node_chains; =20 @@ -1245,6 +1248,7 @@ static int unmerge_and_remove_all_rmap_items(void) spin_unlock(&ksm_mmlist_lock); =20 mm_slot_free(mm_slot_cache, mm_slot); + atomic_long_dec(&ksm_mm_slots); clear_bit(MMF_VM_MERGEABLE, &mm->flags); clear_bit(MMF_VM_MERGE_ANY, &mm->flags); mmdrop(mm); @@ -2717,6 +2721,7 @@ static struct ksm_rmap_item *scan_get_next_rmap_item(= struct page **page) spin_unlock(&ksm_mmlist_lock); =20 mm_slot_free(mm_slot_cache, mm_slot); + atomic_long_dec(&ksm_mm_slots); clear_bit(MMF_VM_MERGEABLE, &mm->flags); clear_bit(MMF_VM_MERGE_ANY, &mm->flags); mmap_read_unlock(mm); @@ -3000,6 +3005,7 @@ int __ksm_enter(struct mm_struct *mm) list_add_tail(&slot->mm_node, &ksm_scan.mm_slot->slot.mm_node); spin_unlock(&ksm_mmlist_lock); =20 + atomic_long_inc(&ksm_mm_slots); set_bit(MMF_VM_MERGEABLE, &mm->flags); mmgrab(mm); =20 @@ -3042,6 +3048,7 @@ void __ksm_exit(struct mm_struct *mm) =20 if (easy_to_free) { mm_slot_free(mm_slot_cache, mm_slot); + atomic_long_dec(&ksm_mm_slots); clear_bit(MMF_VM_MERGE_ANY, &mm->flags); clear_bit(MMF_VM_MERGEABLE, &mm->flags); mmdrop(mm); @@ -3374,7 +3381,8 @@ static void wait_while_offlining(void) long ksm_process_profit(struct mm_struct *mm) { return (long)(mm->ksm_merging_pages + mm_ksm_zero_pages(mm)) * PAGE_SIZE - - mm->ksm_rmap_items * sizeof(struct ksm_rmap_item); + mm->ksm_rmap_items * sizeof(struct ksm_rmap_item) - + (test_bit(MMF_VM_MERGEABLE, &mm->flags) ? sizeof(struct ksm_mm_slot) : 0= ); } #endif /* CONFIG_PROC_FS */ =20 @@ -3672,7 +3680,8 @@ static ssize_t general_profit_show(struct kobject *ko= bj, long general_profit; =20 general_profit =3D (ksm_pages_sharing + atomic_long_read(&ksm_zero_pages)= ) * PAGE_SIZE - - ksm_rmap_items * sizeof(struct ksm_rmap_item); + ksm_rmap_items * sizeof(struct ksm_rmap_item) - + atomic_long_read(&ksm_mm_slots) * sizeof(struct ksm_mm_slot); =20 return sysfs_emit(buf, "%ld\n", general_profit); } --=20 2.25.1