From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from penguin.e-mind.com (penguin.e-mind.com [195.223.140.120]) by kvack.org (8.8.7/8.8.7) with ESMTP id SAA28027 for ; Sun, 17 Jan 1999 18:57:09 -0500 Date: Mon, 18 Jan 1999 00:47:07 +0100 (CET) From: Andrea Arcangeli Reply-To: Andrea Arcangeli Subject: Re: [patch] NEW: arca-vm-21, swapout via shrink_mmap using PG_dirty In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Steve Bergman , dlux@dlux.sch.bme.hu, "Nicholas J. Leon" , "Eric W. Biederman" , Kalle Andersson Cc: Linus Torvalds , brent verner , "Garst R. Reese" , Kalle Andersson , Zlatko Calusic , Ben McCann , bredelin@ucsd.edu, linux-kernel@vger.rutgers.edu, linux-mm@kvack.org, Alan Cox , "Stephen C. Tweedie" , Heinz Mauelshagen , Max List-ID: On Sat, 16 Jan 1999, Andrea Arcangeli wrote: > With the bug fixed it seems really rock solid. It would be interesting > making performance comparison with kernels that are swapping out in > swap_out() (e.g. clean pre7). I am not sure it's a win (but I'm sure it's Even if rock solid my PG_dirty implementation is been a lose. This because swapping out from shrink_mmap() was causing not ordered write to disk. So even if the process userspace was ordered in the swap, it was async written not-ordered. This was harming a _lot_ swapout performances... There's also the point that shrink_mmap() is so highly/default used that stalling in it many times (if unlucky due many consecutive dirty swap cache pages to sync to disk) was not the best. So I dropped the shrink_mmap()-swapout idea completly. But I had new ideas that here has improved things a _lot_. Steve could you try the image test over this new patch against pre7 clean? Also you Kelle, could you try my new arca-vm-24 on your 16Mbyte machine? I think that you'll be very happy ;). Note, arca-vm-24 is tunable: /proc/sys/vm/pager has 5 entry: 6 10 32 32 2048 The first is the lower priority that try_to_free_pages() uses. The most this value is high, the lower will be the starting priority, and this will result in more swapping. 6 is a rasonable value. If the system swap too much even if not low on memory you could decrease this value to 4 for example. The second value is the max percentage of cache in the system that we take even if we are very low on memory (the system should autobalance close to that percentage after some time). The `cache' is intended as cache+buffers. The third is the number of pages we free every time a process try to reclaim memory but when the system is low on memory. 32 pages at time is a safe value. Incresing this value will cause the process that get stuck in the freeing memory path to stall for more time (so it could harm iteractive performances). The fourth is the cluster size on the swap space. pre7 set it to 512 pages, but I checked that it's a _lose_. 32 is/was a good value. The fifth number is the number of pages that we allow to run async at the same time (when the limit is reached we'll wait for I/O completation). pre7 set this value to 32 but that value is a _bottleneck_ for some rasonable fast system. Increasing too much this value could cause the system to have too much page in fly to disk at one time and so it could risk to go out of memory (if the freepages.min is too low, note I never tried arca-mv-24 on verylow memory and I don't know if it's reproducible). That never happens here and 2048 is something like infinite. But I am running with freepages.min = 255 because I have 128Mbyte of RAM. So if arca-vm-24 will kill random processes on your system (search for Out of memory messages in `dmesg`) the first thing you should try is: echo 6 10 32 32 32 >/proc/sys/vm/pager this way you'll return to clean pre7 from this point of view. begin 664 2.2.0-pre7-arca-VM-24.gz M'XL("+MOHC8"`S(N,BXP+7!R93 MFRM9E"U2#\MRXZUK.XVW=NSC1],]:0X/14$2:XE4^?#C9KV_?6<&(`F0E.WT M)JTD`IC!8#"8%X8Y#2;\<<06?I`^[DSCG7$ZG?)HV]N8^-,I:Z?5GI&UC7]W MU_98V_:V96VTV^WUP,:UF[#_=@/&]IAEC_J#4:?+K+V]O8U6JU4%RX=;`V;M MCJSAJ-\3PW_ZB;5WN[OF@+7P:Y?]]-,&,^`/6Z6)LW!C^(C2QGC>W*?V\;Q] M,':FBS2>)_Z2L_>L0QW/&RW#2,+4FSMBTAPDXDD:!6P\QZ?G#2:F[/=HRGX_ MFU(@AKD[^=]<>(F_#U-YPES:O.J"TAVL'T%9VE:UV19Y1VM0M=LK%ULK+4[1"Y;NWOF'G'Y'Q,^]0/.?O[H7/&_#*,+S&`=YD]9 M,N=,<(W-W9B-.0^8']R["W\"7)^PK1T-^C(*$^Y!AS%`%%8)A1^S53:"0#=: M&;`8X:S<&.E\NFI@.VXXS.PVFP5H>6^-F"?.V$\: ME[\X$8=&'GA\8K)WI3G:!].%.XL!TP:#S6=LB]U$3X".W7&^(KJ789PP+UPN MPV#QQ-(8R`;A6TQB8`*+_6"VX,QS/1@)O.`0X6#P/T\4$F$N[8_)C:L*`V$'+,5Q'W:*O:[(&S21C\*Q'K`XK:?UXE)%G_'U)4J'_8V%JHV"WUZ*;A.P;>V8/F#2(_5G`46Y` M6L+I%+81=7Z<1*F7"&G="H!7#J@U,D%N$BY]S\'CG@8PMEW@`'O"T@!/_WX% M->WZ/BH[@4`TF"2J;!7&L3]&S;$2ZM*-GP)O'H5!F,;0C"HP(^G!]1-AM-@6 M_JY0N[6"HWPOZ:55=SNF;<.R[3W3[FB*'(1U$7IWH(<-UM&:>12%$;1:6FLA MV=!E%^(+71,_2IZ@M:NUIJLDQ"5!1T_KF$:<.^XTX3A)7\?$O2CO&FA=\8.[ MUJ6MI:]UU:QEH`V0:]G5&K.U#*NXY%I@F:V:M71*&PD>T#UN8]="KP;D M\MP%50EZ%*0G27S0]J"`T9*0VG;'8)RVM[)/`U\*M<(.M(T!1Q&4];Q7.,TEM+!LGU:V3<2M&H M(R(3F]=P?``I.D0YJ$-2B-AK:(Y!XM:B*<2Q!@WIBO[0M-#G`Z?"LG5=`:.O M>8("F*%6;!XVOT8:0H.@'J&5M:16V'F]Y"/0MKMV.80'-^]+/HC_34%3PF\MVV/=!28;`ZN\'WH3\"- M7(+V@G`OG'#AB&D&$WSAMARNVVSL=LB@KP5`DQ_/P3N_0.>36S$8%(9 M\N'P^N;H\.RL43L6G7&57I@K0%]].P>6,''!2&W`,&J(1 M''!V<,`N#W\Y<:X_GGZX:8)K;W4Z[$8"I($&9/V"P#[3GS\P MX8$/K1(QV9(/*B-Q8`2Q"$ASL"T`QNX"(\4J::AW>`!N.YX,Q_GUY.K3R9GC MB&#Z!6\_QHU^Q>&78U[T^?4QK^0Q2@C+GG^O)CE5B\"XF:<"L(=9K9X]Z@\5 MYW^P)[(9O2QGI!^5*`9W/`D3=^'<+TTFW!?X6?7E8=<=X<]7NKQ5"B`01<9W MF$[2.X5JPU-/O]S)!-PP0H)I!0/S"ACOPW^P!C?RYCZ&[FG$V_&*>_X4HH95 M"$>41R,12T-0[(X77,"NW"B!"(:=(4LHE&9!"#%\$#Z@^P9Q-H;J,9\M09CC M;9GAV36M/C!EV#4MP97G?=5HG7XZO7'.S]DW%$%A7]]!7)F0!C/9I]NS,[&: M%<:X,[0-)C-(9%\=)^S`XF1@Q,UK*;)+),F@I[SVYN3WTTY,3QWM-\L M^R\G+&\3+:VB93T8*P_*\2#)[#G'8NA(BT,AR"TS,8PY[- M[$L,`AXBN(2FOVAMH"=^6!4]J.SUMFR2VI5FYP$I!%/-$Z\\"?XM!L7I:K5@ MLV@5`YD=(O$Y$^67C`+LR&LV@8:\;!+4(601]M9;!`U=C4'HOV(0"-[X$/D" MKL]L:]3;U>Q!MTO;W)6[G&F\Z\^7SNWUR;%AZ6V?KTYO3BY^-;JJ+W/]^?#2 M.3J[O;XYN7+.#W]G7;L(OM5.X7/DUEL<@D4:@R[7@@2".:?_?S\-M@-3>[UAU543A!*%RN]62\ M`HY&_@V+T%`(]88Q=):](7)UQYC!(8V>FED"KF=:7;"RW9[,.];ZZD7DX\!V M@XY"7V3_C8/CU/.$,R'\OHVV$J/@I4,)'C1\@4(/;RCFVFA_`]4-_F.#(G<] M@FNBF90>/C:T#[+,:3MK[L#O9R%5=-/Q.8SN&#HAXJ8GXF#+.'DD(9DOJ>!` M@\;`>DS=D]%#[+`+LR#$MM>4E)]9)V._H%)K5Y^2 M(OY66Y6'-0.*4&L?S\?:!0,WVM]4?TFN>+_0ECAGFH9B8NE-2F,+/7HSTEE/A0[NE=Q)/]:SQ60C.-ZN_:X7XJM MSTX_W?[NH&D^NCES/J*]U+34'>#CBYTIZ+]*68?65W*>ZOHJ>J@6057[V)52 M``VP!(#5(,JE6=^R,&[N6[T\VV:LV@<3\*+Y(_>R$@YHRJ,"T=;"MLQE5X?A M!30\WQQ>_^KWES>G/9R>BQ,(+5T\BPFYX8*VX(R_+5F!0ZY@; M/\6H/->P-^NM9W"IEUAL5UE<1E+#9'L-DS-0XS-((H%TT1VUNZ.NZH[:Y([: M:DKSA*317;![,(G(6!'2^Q#WL3F$=V`W,>NYK68\T:];N0'&FQ"0@,75DY5> M&,3A@CN+<+;@]WQALB/GT#G6TY5K!HD('E`ZE(2X5[T3!!M/ILXJ6G[Y:N)/ MK/%!?:$]NH]?OA9`Y&6-(<9=)LZ?[KTK\.(%%(\(3.D"T5KPY-[G#]BG3RPX M[(3W8%7"Y1+3#G!4HR<9:5L#%&#\&BHI#A1#"(P1D+(H['XI?GSY"L+Y#<3W MVV_G=+`O;F],MEE>^Z8)0]B[EG^XQTZ.7O\`,N6[?-/$4L'=Y0XY4,05O0_[S\0>(0#X"=KD'FUB3 M(#;*9'M;)6([,O-A"L[971/DNV7;>9T5`6=;:RI/[F,^Y\5O)U='%^?GF#HZ M.;^X^A^8O;(W2,>Z?4-$V8K7C7EM^6VQ_-L/'TZN@`ID0):2W<3>O#(#&G+V MJM["VR;`U.[1X=''$Y@`-X9LGIR@<#?^PPFNC@^!CY]@BCL4MPF)7K63S-0F M,>^=:K+RV76S]C8!NOSEQE$72$?$D M^35.29FK75()[ZWO0C7>5PM-ZL#S?#';Q7PQZ.1NQ4U7X?(:.VN7@?:VA[G. 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Andrea Arcangeli -- This is a majordomo managed list. To unsubscribe, send a message with the body 'unsubscribe linux-mm me@address' to: majordomo@kvack.org