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Fri, 16 Apr 2021 18:41:38 +0000 (GMT) Received: from [9.102.1.61] (unknown [9.102.1.61]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 16 Apr 2021 18:41:38 +0000 (GMT) Subject: Re: [PATCH v3 0/6] percpu: partial chunk depopulation To: Roman Gushchin Cc: Dennis Zhou , Tejun Heo , Christoph Lameter , Andrew Morton , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org, pratik.r.sampat@gmail.com References: <20210408035736.883861-1-guro@fb.com> <25c78660-9f4c-34b3-3a05-68c313661a46@linux.ibm.com> <7a001bf6-5708-fb04-4970-367d9845ccb9@linux.ibm.com> <8ea7c616-95e8-e391-5373-ebaf10836d2c@linux.ibm.com> From: Pratik Sampat Message-ID: <09a8d1eb-280d-9ee9-3d68-d065db47a516@linux.ibm.com> Date: Sat, 17 Apr 2021 00:11:37 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: vRKqHLhpJTmd-GC_gJuhk6KaDKvkA1RE X-Proofpoint-GUID: OnYEhr4O8Ssu70WG2hSZYGvL7RFUsdPh X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-16_09:2021-04-16,2021-04-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 phishscore=0 clxscore=1015 suspectscore=0 bulkscore=0 impostorscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104160131 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 61A0A40002CF X-Stat-Signature: oh9pyjwyu8nb55tazn9da1xepskficzb Received-SPF: none (linux.ibm.com>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=mx0a-001b2d01.pphosted.com; client-ip=148.163.156.1 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618598509-916982 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 17/04/21 12:04 am, Roman Gushchin wrote: > On Fri, Apr 16, 2021 at 11:57:03PM +0530, Pratik Sampat wrote: >> >> On 16/04/21 10:43 pm, Roman Gushchin wrote: >>> On Fri, Apr 16, 2021 at 08:58:33PM +0530, Pratik Sampat wrote: >>>> Hello Dennis, >>>> >>>> I apologize for the clutter of logs before, I'm pasting the logs of = before and >>>> after the percpu test in the case of the patchset being applied on 5= .12-rc6 and >>>> the vanilla kernel 5.12-rc6. >>>> >>>> On 16/04/21 7:48 pm, Dennis Zhou wrote: >>>>> Hello, >>>>> >>>>> On Fri, Apr 16, 2021 at 06:26:15PM +0530, Pratik Sampat wrote: >>>>>> Hello Roman, >>>>>> >>>>>> I've tried the v3 patch series on a POWER9 and an x86 KVM setup. >>>>>> >>>>>> My results of the percpu_test are as follows: >>>>>> Intel KVM 4CPU:4G >>>>>> Vanilla 5.12-rc6 >>>>>> # ./percpu_test.sh >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 1952 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 219648 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 219648 kB >>>>>> >>>>>> 5.12-rc6 + with patchset applied >>>>>> # ./percpu_test.sh >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 2080 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 219712 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 72672 kB >>>>>> >>>>>> I'm able to see improvement comparable to that of what you're see = too. >>>>>> >>>>>> However, on POWERPC I'm unable to reproduce these improvements wit= h the patchset in the same configuration >>>>>> >>>>>> POWER9 KVM 4CPU:4G >>>>>> Vanilla 5.12-rc6 >>>>>> # ./percpu_test.sh >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 5888 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 118272 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 118272 kB >>>>>> >>>>>> 5.12-rc6 + with patchset applied >>>>>> # ./percpu_test.sh >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 6144 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 119040 kB >>>>>> Percpu:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= 119040 kB >>>>>> >>>>>> I'm wondering if there's any architectural specific code that need= s plumbing >>>>>> here? >>>>>> >>>>> There shouldn't be. Can you send me the percpu_stats debug output b= efore >>>>> and after? >>>> I'll paste the whole debug stats before and after here. >>>> 5.12-rc6 + patchset >>>> -----BEFORE----- >>>> Percpu Memory Statistics >>>> Allocation Info: >>> Hm, this looks highly suspicious. Here is your stats in a more compac= t form: >>> >>> Vanilla >>> >>> nr_alloc : 9038 nr_alloc : = 97046 >>> nr_dealloc : 6992 nr_dealloc : 94= 237 >>> nr_cur_alloc : 2046 nr_cur_alloc : 2= 809 >>> nr_max_alloc : 2178 nr_max_alloc : 90= 054 >>> nr_chunks : 3 nr_chunks : = 11 >>> nr_max_chunks : 3 nr_max_chunks : = 47 >>> min_alloc_size : 4 min_alloc_size : = 4 >>> max_alloc_size : 1072 max_alloc_size : 1= 072 >>> empty_pop_pages : 5 empty_pop_pages : = 29 >>> >>> >>> Patched >>> >>> nr_alloc : 9040 nr_alloc : = 97048 >>> nr_dealloc : 6994 nr_dealloc : 95= 002 >>> nr_cur_alloc : 2046 nr_cur_alloc : 2= 046 >>> nr_max_alloc : 2208 nr_max_alloc : 90= 054 >>> nr_chunks : 3 nr_chunks : = 48 >>> nr_max_chunks : 3 nr_max_chunks : = 48 >>> min_alloc_size : 4 min_alloc_size : = 4 >>> max_alloc_size : 1072 max_alloc_size : 1= 072 >>> empty_pop_pages : 12 empty_pop_pages : = 61 >>> >>> >>> So it looks like the number of chunks got bigger, as well as the numb= er of >>> empty_pop_pages? This contradicts to what you wrote, so can you, plea= se, make >>> sure that the data is correct and we're not messing two cases? >>> >>> So it looks like for some reason sidelined (depopulated) chunks are n= ot getting >>> freed completely. But I struggle to explain why the initial empty_pop= _pages is >>> bigger with the same amount of chunks. >>> >>> So, can you, please, apply the following patch and provide an updated= statistics? >> Unfortunately, I'm not completely well versed in this area, but yes th= e empty >> pop pages number doesn't make sense to me either. >> >> I re-ran the numbers trying to make sure my experiment setup is sane b= ut >> results remain the same. >> >> Vanilla >> nr_alloc : 9040 nr_alloc : = 97048 >> nr_dealloc : 6994 nr_dealloc : 944= 04 >> nr_cur_alloc : 2046 nr_cur_alloc : 26= 44 >> nr_max_alloc : 2169 nr_max_alloc : 900= 54 >> nr_chunks : 3 nr_chunks : = 10 >> nr_max_chunks : 3 nr_max_chunks : = 47 >> min_alloc_size : 4 min_alloc_size : = 4 >> max_alloc_size : 1072 max_alloc_size : 10= 72 >> empty_pop_pages : 4 empty_pop_pages : = 32 >> >> With the patchset + debug patch the results are as follows: >> Patched >> >> nr_alloc : 9040 nr_alloc : = 97048 >> nr_dealloc : 6994 nr_dealloc : 943= 49 >> nr_cur_alloc : 2046 nr_cur_alloc : 26= 99 >> nr_max_alloc : 2194 nr_max_alloc : 900= 54 >> nr_chunks : 3 nr_chunks : = 48 >> nr_max_chunks : 3 nr_max_chunks : = 48 >> min_alloc_size : 4 min_alloc_size : = 4 >> max_alloc_size : 1072 max_alloc_size : 10= 72 >> empty_pop_pages : 12 empty_pop_pages : = 54 >> >> With the extra tracing I can see 39 entries of "Chunk (sidelined)" >> after the test was run. I don't see any entries for "Chunk (to depopul= ate)" >> >> I've snipped the results of slidelined chunks because they went on for= ~600 >> lines, if you need the full logs let me know. > Yes, please! That's the most interesting part! Got it. Pasting the full logs of after the percpu experiment was complete= d Percpu Memory Statistics Allocation Info: ---------------------------------------- unit_size : 655360 static_size : 608920 reserved_size : 0 dyn_size : 46440 atom_size : 65536 alloc_size : 655360 Global Stats: ---------------------------------------- nr_alloc : 97048 nr_dealloc : 94349 nr_cur_alloc : 2699 nr_max_alloc : 90054 nr_chunks : 48 nr_max_chunks : 48 min_alloc_size : 4 max_alloc_size : 1072 empty_pop_pages : 54 Per Chunk Stats: ---------------------------------------- Chunk: <- First Chunk nr_alloc : 1081 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 16117 free_bytes : 4 contig_bytes : 4 sum_frag : 4 max_frag : 4 cur_min_alloc : 4 cur_med_alloc : 8 cur_max_alloc : 1072 memcg_aware : 0 Chunk: nr_alloc : 826 max_alloc_size : 1072 empty_pop_pages : 6 first_bit : 819 free_bytes : 640660 contig_bytes : 249896 sum_frag : 464700 max_frag : 306216 cur_min_alloc : 4 cur_med_alloc : 8 cur_max_alloc : 1072 memcg_aware : 0 Chunk: nr_alloc : 0 max_alloc_size : 0 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 0 Chunk: nr_alloc : 90 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 536 free_bytes : 595752 contig_bytes : 26164 sum_frag : 575132 max_frag : 26164 cur_min_alloc : 156 cur_med_alloc : 1072 cur_max_alloc : 1072 memcg_aware : 1 Chunk: nr_alloc : 90 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 0 free_bytes : 597428 contig_bytes : 26164 sum_frag : 596848 max_frag : 26164 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk: nr_alloc : 92 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 0 free_bytes : 595284 contig_bytes : 26164 sum_frag : 590360 max_frag : 26164 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk: nr_alloc : 92 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 0 free_bytes : 595284 contig_bytes : 26164 sum_frag : 583768 max_frag : 26164 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk: nr_alloc : 360 max_alloc_size : 1072 empty_pop_pages : 7 first_bit : 26595 free_bytes : 506640 contig_bytes : 506540 sum_frag : 100 max_frag : 36 cur_min_alloc : 4 cur_med_alloc : 156 cur_max_alloc : 1072 memcg_aware : 1 Chunk: nr_alloc : 12 max_alloc_size : 1072 empty_pop_pages : 3 first_bit : 0 free_bytes : 647524 contig_bytes : 563492 sum_frag : 57872 max_frag : 26164 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk (sidelined): nr_alloc : 52 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 0 free_bytes : 621404 contig_bytes : 203104 sum_frag : 603400 max_frag : 260656 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk (sidelined): nr_alloc : 4 max_alloc_size : 1072 empty_pop_pages : 0 first_bit : 0 free_bytes : 652748 contig_bytes : 570600 sum_frag : 570600 max_frag : 570600 cur_min_alloc : 156 cur_med_alloc : 312 cur_max_alloc : 1072 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 655360 sum_frag : 0 max_frag : 0 cur_min_alloc : 0 cur_med_alloc : 0 cur_max_alloc : 0 memcg_aware : 1 Chunk (sidelined): nr_alloc : 0 max_alloc_size : 1072 empty_pop_pages : 1 first_bit : 0 free_bytes : 655360 contig_bytes : 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