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(pv50p00im-dlb-asmtp-mailmevip.me.com [17.56.9.10]) by pv50p00im-ztdg10021901.me.com (Postfix) with ESMTPSA id A07BF813C8; Fri, 15 Dec 2023 03:43:36 +0000 (UTC) From: sxwjean@me.com To: vbabka@suse.cz, 42.hyeyoo@gmail.com, cl@linux.com, linux-mm@kvack.org Cc: penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, roman.gushchin@linux.dev, corbet@lwn.net, keescook@chromium.org, arnd@arndb.de, akpm@linux-foundation.org, gregkh@linuxfoundation.org, quic_jjohnson@quicinc.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Xiongwei Song Subject: [PATCH v4 4/4] mm/slub: make the description of slab_min_objects helpful in doc Date: Fri, 15 Dec 2023 11:41:50 +0800 Message-Id: <20231215034150.108783-5-sxwjean@me.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231215034150.108783-1-sxwjean@me.com> References: <20231215034150.108783-1-sxwjean@me.com> MIME-Version: 1.0 X-Proofpoint-GUID: 8lD-3Etja8ZIaO9ffj4EqA9SJ3T_cRqs X-Proofpoint-ORIG-GUID: 8lD-3Etja8ZIaO9ffj4EqA9SJ3T_cRqs X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-14_17,2023-12-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 adultscore=0 malwarescore=0 mlxlogscore=999 bulkscore=0 spamscore=0 mlxscore=0 phishscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2308100000 definitions=main-2312150026 X-Rspamd-Queue-Id: F2850A001C X-Rspam-User: X-Stat-Signature: qbqosbtdjxz56x64a17sfni4j4zyjzh5 X-Rspamd-Server: rspam03 X-HE-Tag: 1702611823-928054 X-HE-Meta: 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 y4yLP+Jm SPc3XEJ0yDKwm8xCDu6SJeaks0kQUGCs6jUdVKrED4FhT7OdbL0BTI2bx6FUMBpZ3fx6cVxwf7COcXBeWpSMSQW5fVzoq0tqzeNsOWQB6CoxUGbfCoun2nY6KmqbRJW20KM5Kslcc/frWjN7cVMr++8yx6t86r/DvgboWxTFJYOCn42w3+VqIsFb95RFpg5MbLlyLzhOEl37O8VMgJYKyL7yeokz0PnhUv9Xx5Oa1FZad18jrAfA+mpGyo8ZXmvyvb5F+1HJo27LATacRqR0wvcBZ3Vp2P/ePtYu3G31QfdWzpTigl7to2qU6JEqaNo1ledVYZFQ4lfZ0otpFTM3DyXjARlKOZFbsTtebdG+s2maHheHChensEru7Kl+IVPlUZ50FZxHs9gbT0GM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Xiongwei Song There is no a value assigned to slab_min_objects by default, it always is 0 that is initialized by compiler if no assigned value by command line. min_objects is calculated based on processor numbers in calculate_order(). For more details, see commit 9b2cd506e5f2 ("slub: Calculate min_objects based on number of processors.") Signed-off-by: Xiongwei Song Reviewed-by: Vlastimil Babka --- Documentation/mm/slub.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/mm/slub.rst b/Documentation/mm/slub.rst index 6579a55b7852..213491ffb66f 100644 --- a/Documentation/mm/slub.rst +++ b/Documentation/mm/slub.rst @@ -150,7 +150,7 @@ list_lock once in a while to deal with partial slabs. That overhead is governed by the order of the allocation for each slab. The allocations can be influenced by kernel parameters: -.. slab_min_objects=x (default 4) +.. slab_min_objects=x (default:automatically scaled by number of cpus) .. slab_min_order=x (default 0) .. slab_max_order=x (default 3 (PAGE_ALLOC_COSTLY_ORDER))