From: Baoquan He <bhe@redhat.com>
To: linux-mm@kvack.org
Cc: Baoquan He <bhe@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
rppt@kernel.org
Subject: [PATCH v2 3/6] mm/mm_init.c: add new function calc_nr_all_pages()
Date: Mon, 25 Mar 2024 22:56:43 +0800 [thread overview]
Message-ID: <20240325145646.1044760-4-bhe@redhat.com> (raw)
In-Reply-To: <20240325145646.1044760-1-bhe@redhat.com>
This is a preparation to calculate nr_kernel_pages and nr_all_pages,
both of which will be used later in alloc_large_system_hash().
nr_all_pages counts up all free but not reserved memory in memblock
allocator, including HIGHMEM memory. While nr_kernel_pages counts up
all free but not reserved low memory in memblock allocator, excluding
HIGHMEM memory.
Signed-off-by: Baoquan He <bhe@redhat.com>
---
mm/mm_init.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 153fb2dc666f..c57a7fc97a16 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1264,6 +1264,30 @@ static void __init reset_memoryless_node_totalpages(struct pglist_data *pgdat)
pr_debug("On node %d totalpages: 0\n", pgdat->node_id);
}
+static void __init calc_nr_kernel_pages(void)
+{
+ unsigned long start_pfn, end_pfn;
+ phys_addr_t start_addr, end_addr;
+ u64 u;
+#ifdef CONFIG_HIGHMEM
+ unsigned long high_zone_low = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM];
+#endif
+
+ for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start_addr, &end_addr, NULL) {
+ start_pfn = PFN_UP(start_addr);
+ end_pfn = PFN_DOWN(end_addr);
+
+ if (start_pfn < end_pfn) {
+ nr_all_pages += end_pfn - start_pfn;
+#ifdef CONFIG_HIGHMEM
+ start_pfn = clamp(start_pfn, 0, high_zone_low);
+ end_pfn = clamp(end_pfn, 0, high_zone_low);
+#endif
+ nr_kernel_pages += end_pfn - start_pfn;
+ }
+ }
+}
+
static void __init calculate_node_totalpages(struct pglist_data *pgdat,
unsigned long node_start_pfn,
unsigned long node_end_pfn)
--
2.41.0
next prev parent reply other threads:[~2024-03-25 15:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 14:56 [PATCH v2 0/6] mm/mm_init.c: refactor free_area_init_core() Baoquan He
2024-03-25 14:56 ` [PATCH v2 1/6] x86: remove unneeded memblock_find_dma_reserve() Baoquan He
2024-03-26 6:44 ` Mike Rapoport
2024-03-25 14:56 ` [PATCH v2 2/6] mm/mm_init.c: remove the useless dma_reserve Baoquan He
2024-03-26 6:44 ` Mike Rapoport
2024-03-25 14:56 ` Baoquan He [this message]
2024-03-26 6:57 ` [PATCH v2 3/6] mm/mm_init.c: add new function calc_nr_all_pages() Mike Rapoport
2024-03-26 13:49 ` Baoquan He
2024-03-27 15:40 ` Mike Rapoport
2024-03-25 14:56 ` [PATCH v2 4/6] mm/mm_init.c: remove meaningless calculation of zone->managed_pages in free_area_init_core() Baoquan He
2024-03-27 15:40 ` Mike Rapoport
2024-03-28 8:32 ` Baoquan He
2024-03-28 9:53 ` Mike Rapoport
2024-03-28 14:46 ` Baoquan He
2024-03-28 9:12 ` [PATCH v3 " Baoquan He
2024-03-25 14:56 ` [PATCH v2 5/6] mm/mm_init.c: remove unneeded calc_memmap_size() Baoquan He
2024-03-27 16:21 ` Mike Rapoport
2024-03-28 1:24 ` Baoquan He
2024-03-25 14:56 ` [PATCH v2 6/6] mm/mm_init.c: remove arch_reserved_kernel_pages() Baoquan He
2024-03-26 6:57 ` Mike Rapoport
2024-03-27 15:41 ` Mike Rapoport
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