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Thunderbird/102.9.1 Subject: Re: [RFC 8/8] shmem: add support to customize block size on multiple PAGE_SIZE To: Luis Chamberlain , hughd@google.com, akpm@linux-foundation.org, willy@infradead.org, brauner@kernel.org, djwong@kernel.org Cc: p.raghav@samsung.com, da.gomez@samsung.com, a.manzanares@samsung.com, dave@stgolabs.net, yosryahmed@google.com, keescook@chromium.org, hare@suse.de, kbusch@kernel.org, patches@lists.linux.dev, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20230421214400.2836131-1-mcgrof@kernel.org> <20230421214400.2836131-9-mcgrof@kernel.org> Content-Language: en-US From: Jane Chu In-Reply-To: <20230421214400.2836131-9-mcgrof@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SA0PR11CA0018.namprd11.prod.outlook.com (2603:10b6:806:d3::23) To SJ0PR10MB4429.namprd10.prod.outlook.com (2603:10b6:a03:2d1::14) MIME-Version: 1.0 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR10MB7637 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-21_08,2023-04-21_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 phishscore=0 adultscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304220047 X-Proofpoint-GUID: -x80ccYHPoUcbGfWi4wD9EFTi2aI1x1j X-Proofpoint-ORIG-GUID: -x80ccYHPoUcbGfWi4wD9EFTi2aI1x1j Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 4/21/2023 2:44 PM, Luis Chamberlain wrote: [..] > + /* > + * We cap this to allow a block to be at least allowed to > + * be allocated using the buddy allocator. That's MAX_ORDER > + * pages. So 4 MiB on x86_64. 8 MiB? since MAX_ORDER is 11. > + */ > + if (ctx->blocksize > (1 << (MAX_ORDER + PAGE_SHIFT))) > + goto bad_value; > + > + /* The blocksize must be a multiple of the page size so must be aligned */ > + if (!PAGE_ALIGNED(ctx->blocksize)) > + goto bad_value; > + break; > } > return 0; -jane