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Fri, 2 Jul 2021 09:44:56 +0000 (GMT) From: Ohhoon Kwon To: david@redhat.com, ohoono.kwon@samsung.com, akpm@linux-foundation.org, mhocko@suse.com Cc: bhe@redhat.com, rppt@linux.ibm.com, ohkwon1043@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] mm: sparse: pass section_nr to find_memory_block Date: Fri, 2 Jul 2021 18:41:31 +0900 Message-Id: <20210702094132.6276-3-ohoono.kwon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210702094132.6276-1-ohoono.kwon@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrMKsWRmVeSWpSXmKPExsWy7bCmvq7kg3sJBhOu6FnMWb+GzeL8g19s Fl/X/2K2uLxrDpvFvTX/WS3u9zlY7N3va7Hr5wpmixtTGtgcOD12zrrL7rHp0yR2jxMzfrN4 TFh0gNHj/b6rbB59W1YxeqzfcpXF4/MmuQCOqBybjNTElNQihdS85PyUzLx0WyXv4HjneFMz A0NdQ0sLcyWFvMTcVFslF58AXbfMHKDrlBTKEnNKgUIBicXFSvp2NkX5pSWpChn5xSW2SqkF KTkFhgYFesWJucWleel6yfm5VoYGBkamQJUJORnn1gYUbBer2Db1OXsDY6twFyMnh4SAiUT/ hpPMXYxcHEICOxglZu9bzgKSEBL4xChxt7sGIvGNUeLg0oNsMB3dt+4xQiT2Mkr87LvHBuEA dWx/voERpIpNQFtif+8JZhBbRCBaYvbVDiYQm1mgQKKh/xPYCmEBV4nVM3aC2SwCqhLPnk1g BbF5Bawlfj78D7VNXmL1hgNgczgFbCROdO5lBVkmIfCSXeLs9k2MEEUuElf7Z0HZwhKvjm9h h7ClJD6/28sG0dDPKHGobztU9wRGifVdjUBVHECOvcT7SxYgJrOApsT6XfoQvYoSO3/PZYQ4 mk/i3dceVohqXomONiEIU1Vi2W8PiGppib7pl6FO9pBY9esxNICAtv5f2sk8gVFuFsKCBYyM qxjFUguKc9NTiw0LTJAjbBMjOPVpWexgnPv2g94hRiYOxkOMEhzMSiK8ofPuJQjxpiRWVqUW 5ccXleakFh9iNAUG3kRmKdHkfGDyzSuJNzQ1MjY2tjAxMzczNVYS593JdihBSCA9sSQ1OzW1 ILUIpo+Jg1OqgalFbkUlv8C0mIq1zy0PHKtfcOaZ22q57FuyJxo//jKcPSEvLLNMR13zH8f1 C19m8Z1WeldTGr3z0Zmzf3Y2pzPsP3z0b12k+rknV/pFQrwaxE7NYGj+VbKE83ns7G0RqU6R HOviJm62Xie0cOkGpeJuiQhRXYPtHtwrztW+Dzq8a5HvvMRrp/JWGNgHz8uartl5N4Wt8UbK zySbjWeaQoySNl90C5reb5pw7qn4n5er7nUoznfwdCozm2jas7D5s7QZ/xvhvF1VnxJa7E/I O30seJ+RKn46fYVVkPuPrSZBvy/5On6bMTW1lvUPl8f7dx/jy66qT7MRYXlTuzbOa8qVTI7N pYFXGGddu9MhZajEUpyRaKjFXFScCADmkZdmBgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNLMWRmVeSWpSXmKPExsWy7bCSnK7Eg3sJBns7bCzmrF/DZnH+wS82 i6/rfzFbXN41h83i3pr/rBb3+xws9u73tdj1cwWzxY0pDWwOnB47Z91l99j0aRK7x4kZv1k8 Jiw6wOjxft9VNo++LasYPdZvucri8XmTXABHFJdNSmpOZllqkb5dAlfGubUBBdvFKrZNfc7e wNgq3MXIySEhYCLRfeseYxcjF4eQwG5GiWm9E1kgEtIST1/sArI5gGxhicOHiyFqPjBKbFz6 khWkhk1AW2J/7wlmkBoRgXiJ+dfYQcLMAmUSV1f+BSsRFnCVWD1jJ9hIFgFViWfPJoDFeQWs JX4+/M8GsUpeYvWGA8wgNqeAjcSJzr1gNUJANZ93H2efwMi3gJFhFaNkakFxbnpusWGBYV5q uV5xYm5xaV66XnJ+7iZGcHhqae5g3L7qg94hRiYOxkOMEhzMSiK8ofPuJQjxpiRWVqUW5ccX leakFh9ilOZgURLnvdB1Ml5IID2xJDU7NbUgtQgmy8TBKdXAlL9PkGPBhOcrv8ncZz21sJzt 3+KLz/eni0e8SUjatWy66umMPW4qfPKcRz6vzPnAP1nn+E+ztJgL836bnLf15FzNLfhw4jq1 9b5b4izMnGbe414ot9zk+PJzG3U+tfjp6Ww9ssT1y6KJy29L61l0OXzl0p0TFMca1Fp9QuqU UqXUx78eelI3rDSFeN7X3C18yHnqmeiCTftvBrb++ZSX8n3yooBrn+f3r3Ja6O88NWyr2auV m+Xjwz3jP5Qw/3bmdnnyKqBRiOO7lxl7+rVTdf7tLZd/+vZ5Zs790lgormH90n/ztaXHjP68 KV7m3OhjZWM201vJxK5v5e3wJe/rBCR/3noUP0HOaOWWpnMh3UosxRmJhlrMRcWJANc2qL2+ AgAA X-CMS-MailID: 20210702094457epcas1p40fba85e22861cf1cc85a085719030c24 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210702094457epcas1p40fba85e22861cf1cc85a085719030c24 References: <20210702094132.6276-1-ohoono.kwon@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With CONFIG_SPARSEMEM_EXTREME enabled, __section_nr() which converts mem_section to section_nr could be costly since it iterates all section roots to check if the given mem_section is in its range. On the other hand, __nr_to_section() which converts section_nr to mem_section can be done in O(1). Let's pass section_nr instead of mem_section ptr to find_memory_block() in order to reduce needless iterations. Signed-off-by: Ohhoon Kwon --- arch/powerpc/platforms/pseries/hotplug-memory.c | 4 +--- drivers/base/memory.c | 4 ++-- include/linux/memory.h | 2 +- 3 files changed, 4 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index 8377f1f7c78e..905790092e0e 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -211,13 +211,11 @@ static int update_lmb_associativity_index(struct drmem_lmb *lmb) static struct memory_block *lmb_to_memblock(struct drmem_lmb *lmb) { unsigned long section_nr; - struct mem_section *mem_sect; struct memory_block *mem_block; section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr)); - mem_sect = __nr_to_section(section_nr); - mem_block = find_memory_block(mem_sect); + mem_block = find_memory_block(section_nr); return mem_block; } diff --git a/drivers/base/memory.c b/drivers/base/memory.c index d5ffaab3cb61..e31598955cc4 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -578,9 +578,9 @@ static struct memory_block *find_memory_block_by_id(unsigned long block_id) /* * Called under device_hotplug_lock. */ -struct memory_block *find_memory_block(struct mem_section *section) +struct memory_block *find_memory_block(unsigned long section_nr) { - unsigned long block_id = memory_block_id(__section_nr(section)); + unsigned long block_id = memory_block_id(section_nr); return find_memory_block_by_id(block_id); } diff --git a/include/linux/memory.h b/include/linux/memory.h index 97e92e8b556a..d9a0b61cd432 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -90,7 +90,7 @@ int create_memory_block_devices(unsigned long start, unsigned long size, void remove_memory_block_devices(unsigned long start, unsigned long size); extern void memory_dev_init(void); extern int memory_notify(unsigned long val, void *v); -extern struct memory_block *find_memory_block(struct mem_section *); +extern struct memory_block *find_memory_block(unsigned long section_nr); typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *); extern int walk_memory_blocks(unsigned long start, unsigned long size, void *arg, walk_memory_blocks_func_t func); -- 2.17.1