From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvdimm@lists.01.org, davem@davemloft.net,
pavel.tatashin@microsoft.com, mhocko@suse.com, mingo@kernel.org,
kirill.shutemov@linux.intel.com, dan.j.williams@intel.com,
dave.jiang@intel.com, rppt@linux.vnet.ibm.com,
willy@infradead.org, vbabka@suse.cz, khalid.aziz@oracle.com,
ldufour@linux.vnet.ibm.com, mgorman@techsingularity.net,
yi.z.zhang@linux.intel.com
Subject: Re: [mm PATCH v5 7/7] mm: Use common iterator for deferred_init_pages and deferred_free_pages
Date: Fri, 9 Nov 2018 23:13:38 -0500 [thread overview]
Message-ID: <20181110041338.7ttram7po7a2ssz7@xakep.localdomain> (raw)
In-Reply-To: <154145280115.30046.13334106887516645119.stgit@ahduyck-desk1.jf.intel.com>
On 18-11-05 13:20:01, Alexander Duyck wrote:
> +static unsigned long __next_pfn_valid_range(unsigned long *i,
> + unsigned long end_pfn)
> {
> - if (!pfn_valid_within(pfn))
> - return false;
> - if (!(pfn & (pageblock_nr_pages - 1)) && !pfn_valid(pfn))
> - return false;
> - return true;
> + unsigned long pfn = *i;
> + unsigned long count;
> +
> + while (pfn < end_pfn) {
> + unsigned long t = ALIGN(pfn + 1, pageblock_nr_pages);
> + unsigned long pageblock_pfn = min(t, end_pfn);
> +
> +#ifndef CONFIG_HOLES_IN_ZONE
> + count = pageblock_pfn - pfn;
> + pfn = pageblock_pfn;
> + if (!pfn_valid(pfn))
> + continue;
> +#else
> + for (count = 0; pfn < pageblock_pfn; pfn++) {
> + if (pfn_valid_within(pfn)) {
> + count++;
> + continue;
> + }
> +
> + if (count)
> + break;
> + }
> +
> + if (!count)
> + continue;
> +#endif
> + *i = pfn;
> + return count;
> + }
> +
> + return 0;
> }
>
> +#define for_each_deferred_pfn_valid_range(i, start_pfn, end_pfn, pfn, count) \
> + for (i = (start_pfn), \
> + count = __next_pfn_valid_range(&i, (end_pfn)); \
> + count && ({ pfn = i - count; 1; }); \
> + count = __next_pfn_valid_range(&i, (end_pfn)))
Can this be improved somehow? It took me a while to understand this
piece of code. i is actually end of block, and not an index by PFN, ({pfn = i - count; 1;}) is
simply hard to parse. Why can't we make __next_pfn_valid_range() to
return both end and a start of a block?
The rest is good:
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Thank you,
Pasha
next prev parent reply other threads:[~2018-11-10 5:46 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 21:19 [mm PATCH v5 0/7] Deferred page init improvements Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 1/7] mm: Use mm_zero_struct_page from SPARC on all 64b architectures Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 2/7] mm: Drop meminit_pfn_in_nid as it is redundant Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 3/7] mm: Implement new zone specific memblock iterator Alexander Duyck
2018-11-09 23:26 ` Pavel Tatashin
2018-11-09 23:58 ` Alexander Duyck
2018-11-10 0:11 ` Pavel Tatashin
2018-11-05 21:19 ` [mm PATCH v5 4/7] mm: Initialize MAX_ORDER_NR_PAGES at a time instead of doing larger sections Alexander Duyck
2018-11-10 1:02 ` Pavel Tatashin
2018-11-19 18:53 ` Alexander Duyck
2018-11-05 21:19 ` [mm PATCH v5 5/7] mm: Move hot-plug specific memory init into separate functions and optimize Alexander Duyck
2018-11-10 2:07 ` Pavel Tatashin
2018-11-05 21:19 ` [mm PATCH v5 6/7] mm: Add reserved flag setting to set_page_links Alexander Duyck
2018-11-10 2:11 ` Pavel Tatashin
2018-11-05 21:20 ` [mm PATCH v5 7/7] mm: Use common iterator for deferred_init_pages and deferred_free_pages Alexander Duyck
2018-11-10 4:13 ` Pavel Tatashin [this message]
2018-11-12 15:12 ` Alexander Duyck
2018-11-09 21:15 ` [mm PATCH v5 0/7] Deferred page init improvements Pavel Tatashin
2018-11-09 23:14 ` Alexander Duyck
2018-11-10 0:00 ` Pavel Tatashin
2018-11-10 0:46 ` Alexander Duyck
2018-11-10 1:16 ` Pavel Tatashin
2018-11-12 19:10 ` Alexander Duyck
2018-11-12 20:37 ` Pavel Tatashin
2018-11-12 16:25 ` Daniel Jordan
2018-11-14 15:07 ` Michal Hocko
2018-11-14 19:12 ` Pavel Tatashin
2018-11-14 21:35 ` Michal Hocko
2018-11-15 0:50 ` Alexander Duyck
2018-11-15 1:55 ` Mike Rapoport
2018-11-15 19:09 ` Mike Rapoport
2018-11-15 8:10 ` Michal Hocko
2018-11-15 16:02 ` Alexander Duyck
2018-11-15 16:40 ` Michal Hocko
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