2024 For_each_mem_pfn

For_each_mem_pfn_range

Author: debm

August undefined, 2024

Web* for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific: 313 * free memblock areas from a given point: 314 * @i: u64 used as loop variable: 315 * @zone: zone in which all of the memory blocks reside: 316 * @p _start: ptr to phys_addr_t for start address of the range, can be %NULL: 317 Webfor_each_free_mem_pfn_range_in_zone_from (i, zone, p_start, p_end) iterate through zone specific free memblock areas from a given point. Parameters. i. u64 used as loop variable. zone. zone in which all of the memory blocks reside. p_start. ptr to phys_addr_t for start address of the range, can be NULL.

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WebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [RFC PATCH 1/2] mm/memblock: introduce for_each_mem_pfn_range_rev() @ 2024-02-11 2:18 Wei Yang 2024-02-11 2:18 ` [RFC PATCH 2/2] mm/sparse: add last_section_nr in sparse_init() to reduce some iteration cycle Wei Yang 0 siblings, 1 reply; 7+ messages in thread From: … WebChangeLog: v24->v25: - mm: change walk_free_mem_block to return 0 (instead of true) on completing the report, and return a non-zero value from the callabck, which stops the reporting. texas oil singapore

[PATCH v3 0/5] optimize memblock_next_valid_pfn and early_pfn…

WebPage tables are a series of memory pages which sparsely map virtual memory addresses to physical ones. The x86-64 CPU has a specific register where the physical address of the top-level page table (PGD) is placed and the CPU hardware then uses this to decode all memory addresses used. Each entry in a page table must be aligned to 4 KiB and can ... WebNov 7, 2024 · map pfn ram range req uncached-minus for [mem 0xABC-0xCBA], got write-back. In my understanding, write-back is cached memory. But I need uncached memory for the DMA operation. The Code (only showing the important parts): User App. WebA tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. texas oil rush

Memory mapping — The Linux Kernel documentation

For_each_mem_pfn_range

Need help mapping pre-reserved **cacheable** DMA buffer on …

Web* for_each_physmem_range - iterate through physmem areas not included in type. * @i: u64 used as loop variable * @type: ptr to memblock_type which excludes from the … WebFeb 19, 2024 · /** * for_each_mem_pfn_range - early memory pfn range iterator * @i: an integer used as loop variable * @nid: node selector, %MAX_NUMNODES for all nodes * @p_start: ptr to ulong for start pfn of the range, can be %NULL * @p_end: ptr to ulong for end pfn of the range, can be %NULL * @p_nid: ptr to int for nid of the range, can be …

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WebFrom: Mike Rapoport To: Andrew Morton Cc: Andy Lutomirski , Benjamin Herrenschmidt … Webfor_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid) memory_present(nid, start, end);} /* * Subtle, we encode the real pfn into the mem_map such that * the identity pfn - section_mem_map will return the actual * physical page frame number. */ static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)

WebNov 28, 2012 · - * [0 to max_low_pfn) and [4GB to max_pfn) because of possible memory holes in - * high addresses that cannot be marked as UC by fixed/variable range MTRRs. - * Depending on the alignment of E820 ranges, this may possibly result in using WebMar 4, 2024 · Commit aa47a7c ("lib/cpumask: deprecate nr_cpumask_bits") resulted in the cpumask operations potentially becoming hugely less efficient, because suddenly the cpumask was always considered to be variable-sized. The optimization was then later added back in a limited form by commit 6f9c07b ("lib/cpumask: add FORCE_NR_CPUS config …

WebApr 3, 2024 · // SPDX-License-Identifier: GPL-2.0-or-later. 1118 */ 1119 Web+ for_each_mem_pfn_range (i, MAX_NUMNODES, &start, &end, &nid) { if (next < start) - pgcnt += init_unavailable_range (PFN_DOWN (next), - PFN_UP (start)); + pgcnt += …

WebOf course, we want to support any device block size in any Linux VM. Bigger device block sizes will become especially important once supporting VFIO in QEMU - each device block has to be mapped separately, and the maximum number of mappings for VFIO is 64k. So we usually want blocks in the gigabyte range when wanting to grow the VM big.

WebThe PFN is an offset, counted in pages, within the physical memory map. The first PFN usable by the system, min_low_pfn is located at the beginning of the first page after _end which is the end of the loaded kernel image. … texas oil solutionsWebThis function is called for each reserved region just before the memory is freed from memblock to the buddy page allocator. The struct pages for MEMBLOCK_NOMAP regions are kept with the default values set by the memory map initialization which makes it necessary to have a special treatment for such pages in pfn_valid() and pfn_valid_within(). texas oil slot gameWebApr 12, 2024 · 反馈bug/问题模板，提建议请删除 1.关于你要提交的问题 Q：是否搜索了issue (使用 "x" 选择) [] 没有类似的issue 2. 详细叙述 (1) 具体问题 A：关于在活动连接、客户端多的时候，软中断变多，且CPU占用会变高，网速变慢的问题目前连接数在5000左右，客户端在65左右，使用top命令查看占用情况，会发现 ... texas oil showWebNov 7, 2024 · Drivers wanting to export some pages to userspace do it by using mmap interface and a combination of 1) pgprot_noncached () 2) io_remap_pfn_range () or … texas oil sitesWebLKML Archive on lore.kernel.org help / color / mirror / Atom feed From: Robin Holt To: "H. Peter Anvin" , Ingo Molnar Cc: Robin Holt , Nate Zimmer , Linux Kernel , Linux MM , Rob Landley … texas oil spillWebThis causes shrinking node 0's pfn range because it is calculated by the address range of memblock.memory. So some of struct pages in the gap range are left uninitialized. We have a function zero_resv_unavail() which does zeroing the struct pages outside memblock.memory, but currently it covers only the reserved texas oil sharesWebMar 9, 2024 · * On a multi-node machine a per-node cma area is allocated on each node. Following gigantic hugetlb allocation are using the first available numa node if the mask … texas oil shale