From: Mike Rapoport <rppt@kernel.org>
To: Baoquan He <bhe@redhat.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org, x86@kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/6] mm/mm_init.c: add new function calc_nr_all_pages()
Date: Tue, 26 Mar 2024 08:57:29 +0200 [thread overview]
Message-ID: <ZgJx2RLPAdom1EbE@kernel.org> (raw)
In-Reply-To: <20240325145646.1044760-4-bhe@redhat.com>
Hi Baoquan,
On Mon, Mar 25, 2024 at 10:56:43PM +0800, Baoquan He wrote:
> 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.
Sorry I've missed this in the previous review, but I think this patch and
the patch "remove unneeded calc_memmap_size()" can be merged into "remove
meaningless calculation of zone->managed_pages in free_area_init_core()"
with an appropriate update of the commit message.
With the current patch splitting there will be compilation warning about unused
function for this and the next patch.
> 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
>
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2024-03-26 6:58 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 ` [PATCH v2 3/6] mm/mm_init.c: add new function calc_nr_all_pages() Baoquan He
2024-03-26 6:57 ` Mike Rapoport [this message]
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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