From: Baoquan He <bhe@redhat.com> To: linux-kernel@vger.kernel.org, dave.hansen@intel.com Cc: linux-mm@kvack.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, mhocko@suse.com, tglx@linutronix.de, Baoquan He <bhe@redhat.com> Subject: [PATCH v2 0/3] mm/sparse: Optimize memmap allocation during sparse_init() Date: Thu, 22 Feb 2018 17:11:27 +0800 [thread overview] Message-ID: <20180222091130.32165-1-bhe@redhat.com> (raw) This is v2 post. V1 can be found here: https://www.spinics.net/lists/linux-mm/msg144486.html In sparse_init(), two temporary pointer arrays, usemap_map and map_map are allocated with the size of NR_MEM_SECTIONS. They are used to store each memory section's usemap and mem map if marked as present. In 5-level paging mode, this will cost 512M memory though they will be released at the end of sparse_init(). System with few memory, like kdump kernel which usually only has about 256M, will fail to boot because of allocation failure if CONFIG_X86_5LEVEL=y. In this patchset, optimize the memmap allocation code to only use usemap_map and map_map with the size of nr_present_sections. This makes kdump kernel boot up with normal crashkernel='' setting when CONFIG_X86_5LEVEL=y. Baoquan He (3): mm/sparse: Add a static variable nr_present_sections mm/sparsemem: Defer the ms->section_mem_map clearing mm/sparse: Optimize memmap allocation during sparse_init() mm/sparse-vmemmap.c | 9 +++++---- mm/sparse.c | 54 +++++++++++++++++++++++++++++++++++------------------ 2 files changed, 41 insertions(+), 22 deletions(-) -- 2.13.6
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From: Baoquan He <bhe@redhat.com> To: linux-kernel@vger.kernel.org, dave.hansen@intel.com Cc: linux-mm@kvack.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, mhocko@suse.com, tglx@linutronix.de, Baoquan He <bhe@redhat.com> Subject: [PATCH v2 0/3] mm/sparse: Optimize memmap allocation during sparse_init() Date: Thu, 22 Feb 2018 17:11:27 +0800 [thread overview] Message-ID: <20180222091130.32165-1-bhe@redhat.com> (raw) This is v2 post. V1 can be found here: https://www.spinics.net/lists/linux-mm/msg144486.html In sparse_init(), two temporary pointer arrays, usemap_map and map_map are allocated with the size of NR_MEM_SECTIONS. They are used to store each memory section's usemap and mem map if marked as present. In 5-level paging mode, this will cost 512M memory though they will be released at the end of sparse_init(). System with few memory, like kdump kernel which usually only has about 256M, will fail to boot because of allocation failure if CONFIG_X86_5LEVEL=y. In this patchset, optimize the memmap allocation code to only use usemap_map and map_map with the size of nr_present_sections. This makes kdump kernel boot up with normal crashkernel='' setting when CONFIG_X86_5LEVEL=y. Baoquan He (3): mm/sparse: Add a static variable nr_present_sections mm/sparsemem: Defer the ms->section_mem_map clearing mm/sparse: Optimize memmap allocation during sparse_init() mm/sparse-vmemmap.c | 9 +++++---- mm/sparse.c | 54 +++++++++++++++++++++++++++++++++++------------------ 2 files changed, 41 insertions(+), 22 deletions(-) -- 2.13.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2018-02-22 9:11 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-02-22 9:11 Baoquan He [this message] 2018-02-22 9:11 ` [PATCH v2 0/3] mm/sparse: Optimize memmap allocation during sparse_init() Baoquan He 2018-02-22 9:11 ` [PATCH v2 1/3] mm/sparse: Add a static variable nr_present_sections Baoquan He 2018-02-22 9:11 ` Baoquan He 2018-02-22 21:24 ` Andrew Morton 2018-02-22 21:24 ` Andrew Morton 2018-02-22 23:56 ` Baoquan He 2018-02-22 23:56 ` Baoquan He 2018-02-22 9:11 ` [PATCH v2 2/3] mm/sparsemem: Defer the ms->section_mem_map clearing Baoquan He 2018-02-22 9:11 ` Baoquan He 2018-02-22 9:11 ` [PATCH v2 3/3] mm/sparse: Optimize memmap allocation during sparse_init() Baoquan He 2018-02-22 9:11 ` Baoquan He 2018-02-22 10:07 ` Pankaj Gupta 2018-02-22 10:07 ` Pankaj Gupta 2018-02-22 10:39 ` Baoquan He 2018-02-22 10:39 ` Baoquan He 2018-02-22 22:22 ` Dave Hansen 2018-02-22 22:22 ` Dave Hansen 2018-02-23 2:38 ` Baoquan He 2018-02-23 2:38 ` Baoquan He 2018-02-22 9:15 ` [PATCH v2 0/3] " Baoquan He 2018-02-22 9:15 ` Baoquan He
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