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Date: Tue, 5 Aug 2008 12:14:50 +0100 From: Mel Gorman <mel@....ul.ie> To: Yasunori Goto <y-goto@...fujitsu.com> Cc: Christoph Lameter <cl@...ux-foundation.org>, Badari Pulavarty <pbadari@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm <linux-mm@...ck.org>, Linux Kernel ML <linux-kernel@...r.kernel.org> Subject: Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing On (05/08/08 15:39), Yasunori Goto didst pronounce: > > > >> Duh. Then the use of RCU would also mean that all of reclaim must > > >> be in a rcu period. So reclaim cannot sleep anymore. > > > > > > I use srcu_read_lock() (sleepable rcu lock) if kernel must be sleep for > > > page reclaim. So, my patch basic idea is followings. > > > > But that introduces more overhead in __alloc_pages. > > Hmmm. I think SRCU should be used when kernel has to sleep, and sleep time > will be bigger than SRCU's overhead..... > > The followings are results of unixbench and lmbench. > I suppose my patch impacts lantency rather than throghput. > In these results, 100fd select and page fault latencies of lmbench became worse. > So I can't say there is no problem in my patches. > > Anyway, I'll retry to find other less impact way if there is, > and compare benchmark results with this way. > Maybe I am missing something, but what is wrong with stop_machine during memory hot-remove? > Bye. > > ------------ > > Unixbench > ----- > > Normal 2.6.27-rc1-mm1 > > > BYTE UNIX Benchmarks (Version 4.1.0) > System -- Linux localhost.localdomain 2.6.27-rc1-mm1 #1 SMP Mon Aug 4 16:08:48 JST 2008 ia64 ia64 ia64 GNU/Linux > Start Benchmark Run: 2008?$BG/ 8?$B7n 5?$BF| ?$B2PMKF| 10:24:35 JST > 1 interactive users. > 10:24:35 up 9 min, 1 user, load average: 0.16, 0.08, 0.03 > lrwxrwxrwx 1 root root 4 2008-02-25 15:48 /bin/sh -> bash > /bin/sh: symbolic link to `bash' > /dev/sda5 33792348 18360424 13687672 58% /home > Execl Throughput 2954.0 lps (29.8 secs, 3 samples) > File Read 1024 bufsize 2000 maxblocks 1211570.0 KBps (30.0 secs, 3 samples) > File Write 1024 bufsize 2000 maxblocks 281599.0 KBps (30.0 secs, 3 samples) > File Copy 1024 bufsize 2000 maxblocks 218859.0 KBps (30.0 secs, 3 samples) > File Read 256 bufsize 500 maxblocks 328725.0 KBps (30.0 secs, 3 samples) > File Write 256 bufsize 500 maxblocks 72850.0 KBps (30.0 secs, 3 samples) > File Copy 256 bufsize 500 maxblocks 57095.0 KBps (30.0 secs, 3 samples) > File Read 4096 bufsize 8000 maxblocks 3883690.0 KBps (30.0 secs, 3 samples) > File Write 4096 bufsize 8000 maxblocks 1050752.0 KBps (30.0 secs, 3 samples) > File Copy 4096 bufsize 8000 maxblocks 564703.0 KBps (30.0 secs, 3 samples) > Pipe Throughput 462027.5 lps (10.0 secs, 10 samples) > Pipe-based Context Switching 105824.3 lps (10.0 secs, 10 samples) > Process Creation 2242.9 lps (30.0 secs, 3 samples) > System Call Overhead 1320907.8 lps (10.0 secs, 10 samples) > Shell Scripts (1 concurrent) 4442.1 lpm (60.0 secs, 3 samples) > Shell Scripts (8 concurrent) 1810.0 lpm (60.0 secs, 3 samples) > Shell Scripts (16 concurrent) 1042.7 lpm (60.0 secs, 3 samples) > > > INDEX VALUES > TEST BASELINE RESULT INDEX > > Execl Throughput 43.0 2954.0 687.0 > File Copy 1024 bufsize 2000 maxblocks 3960.0 218859.0 552.7 > File Copy 256 bufsize 500 maxblocks 1655.0 57095.0 345.0 > File Copy 4096 bufsize 8000 maxblocks 5800.0 564703.0 973.6 > Pipe Throughput 12440.0 462027.5 371.4 > Pipe-based Context Switching 4000.0 105824.3 264.6 > Process Creation 126.0 2242.9 178.0 > Shell Scripts (8 concurrent) 6.0 1810.0 3016.7 > System Call Overhead 15000.0 1320907.8 880.6 > ========= > FINAL SCORE 565.6 > > > > 2.6.27-rc1-mm1 with my patch > > > BYTE UNIX Benchmarks (Version 4.1.0) > System -- Linux localhost.localdomain 2.6.27-rc1-mm1-goto-test #2 SMP Mon Aug 4 18:50:56 JST 2008 ia64 ia64 ia64 GNU/Linux > Start Benchmark Run: 2008?$BG/ 8?$B7n 4?$BF| ?$B7nMKF| 20:35:11 JST > 1 interactive users. > 20:35:11 up 1:37, 1 user, load average: 0.00, 0.29, 0.71 > lrwxrwxrwx 1 root root 4 2008-02-25 15:48 /bin/sh -> bash > /bin/sh: symbolic link to `bash' > /dev/sda5 33792348 18360420 13687676 58% /home > Execl Throughput 2949.0 lps (29.7 secs, 3 samples) > File Read 1024 bufsize 2000 maxblocks 1317211.0 KBps (30.0 secs, 3 samples) > File Write 1024 bufsize 2000 maxblocks 282643.0 KBps (30.0 secs, 3 samples) > File Copy 1024 bufsize 2000 maxblocks 220360.0 KBps (30.0 secs, 3 samples) > File Read 256 bufsize 500 maxblocks 361448.0 KBps (30.0 secs, 3 samples) > File Write 256 bufsize 500 maxblocks 73172.0 KBps (30.0 secs, 3 samples) > File Copy 256 bufsize 500 maxblocks 57489.0 KBps (30.0 secs, 3 samples) > File Read 4096 bufsize 8000 maxblocks 3819448.0 KBps (30.0 secs, 3 samples) > File Write 4096 bufsize 8000 maxblocks 1026563.0 KBps (30.0 secs, 3 samples) > File Copy 4096 bufsize 8000 maxblocks 585218.0 KBps (30.0 secs, 3 samples) > Pipe Throughput 482681.7 lps (10.0 secs, 10 samples) > Pipe-based Context Switching 101437.7 lps (10.0 secs, 10 samples) > Process Creation 2237.5 lps (30.0 secs, 3 samples) > System Call Overhead 1282198.4 lps (10.0 secs, 10 samples) > Shell Scripts (1 concurrent) 4447.7 lpm (60.0 secs, 3 samples) > Shell Scripts (8 concurrent) 1812.7 lpm (60.0 secs, 3 samples) > Shell Scripts (16 concurrent) 1041.7 lpm (60.0 secs, 3 samples) > > > INDEX VALUES > TEST BASELINE RESULT INDEX > > Execl Throughput 43.0 2949.0 685.8 > File Copy 1024 bufsize 2000 maxblocks 3960.0 220360.0 556.5 > File Copy 256 bufsize 500 maxblocks 1655.0 57489.0 347.4 > File Copy 4096 bufsize 8000 maxblocks 5800.0 585218.0 1009.0 > Pipe Throughput 12440.0 482681.7 388.0 > Pipe-based Context Switching 4000.0 101437.7 253.6 > Process Creation 126.0 2237.5 177.6 > Shell Scripts (8 concurrent) 6.0 1812.7 3021.2 > System Call Overhead 15000.0 1282198.4 854.8 > ========= > FINAL SCORE 566.8 > > > > > > LMBENCH > > The first lines are results of normal 2.6.27-rc1-mm1. > The second lines are results with my patch. > > > > L M B E N C H 3 . 0 S U M M A R Y > ------------------------------------ > (Alpha software, do not distribute) > > Basic system parameters > ------------------------------------------------------------------------------ > Host OS Description Mhz tlb cache mem scal > pages line par load > bytes > --------- ------------- ----------------------- ---- ----- ----- ------ ---- > localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1 > localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1 > > Processor, Processes - times in microseconds - smaller is better > ------------------------------------------------------------------------------ > Host OS Mhz null null open slct sig sig fork exec sh > call I/O stat clos TCP inst hndl proc proc proc > --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- > localhost Linux 2.6.27- 1600 0.03 0.23 3.12 4.45 6.73 0.27 1.75 227. 463. 2219 > localhost Linux 2.6.27- 1600 0.03 0.23 3.13 4.44 6.74 0.27 1.73 207. 448. 2230 > > Context switching - times in microseconds - smaller is better > ------------------------------------------------------------------------- > Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K > ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw > --------- ------------- ------ ------ ------ ------ ------ ------- ------- > localhost Linux 2.6.27- 11.3 11.4 11.5 11.5 12.7 11.8 14.6 > localhost Linux 2.6.27- 11.5 11.4 11.5 11.6 12.8 11.9 14.7 > > *Local* Communication latencies in microseconds - smaller is better > --------------------------------------------------------------------- > Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP > ctxsw UNIX UDP TCP conn > --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- > localhost Linux 2.6.27- 11.3 8.464 28.3 13.4 28.7 46. > localhost Linux 2.6.27- 11.5 8.470 28.3 13.4 32.2 46. > > File & VM system latencies in microseconds - smaller is better > ------------------------------------------------------------------------------- > Host OS 0K File 10K File Mmap Prot Page 100fd > Create Delete Create Delete Latency Fault Fault selct > --------- ------------- ------ ------ ------ ------ ------- ----- ------- ----- > localhost Linux 2.6.27- 15.1 13.4 45.6 25.4 24.0K 0.384 0.23850 2.804 > localhost Linux 2.6.27- 15.8 13.3 43.0 26.0 24.1K 0.401 0.25150 2.835 > > *Local* Communication bandwidths in MB/s - bigger is better > ------------------------------------------------------------------------------ > Host OS Description Mhz tlb cache mem scal > pages line par load > bytes > --------- ------------- ----------------------- ---- ----- ----- ------ ---- > localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1 > localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1 > > Processor, Processes - times in microseconds - smaller is better > ------------------------------------------------------------------------------ > Host OS Mhz null null open slct sig sig fork exec sh > call I/O stat clos TCP inst hndl proc proc proc > --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- > localhost Linux 2.6.27- 1600 0.03 0.23 3.12 4.45 6.73 0.27 1.75 227. 463. 2219 > localhost Linux 2.6.27- 1600 0.03 0.23 3.13 4.44 6.74 0.27 1.73 207. 448. 2230 > > Context switching - times in microseconds - smaller is better > ------------------------------------------------------------------------- > Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K > ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw > --------- ------------- ------ ------ ------ ------ ------ ------- ------- > localhost Linux 2.6.27- 11.3 11.4 11.5 11.5 12.7 11.8 14.6 > localhost Linux 2.6.27- 11.5 11.4 11.5 11.6 12.8 11.9 14.7 > > *Local* Communication latencies in microseconds - smaller is better > --------------------------------------------------------------------- > Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP > ctxsw UNIX UDP TCP conn > --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- > localhost Linux 2.6.27- 11.3 8.464 28.3 13.4 28.7 46. > localhost Linux 2.6.27- 11.5 8.470 28.3 13.4 32.2 46. > > File & VM system latencies in microseconds - smaller is better > ------------------------------------------------------------------------------- > Host OS 0K File 10K File Mmap Prot Page 100fd > Create Delete Create Delete Latency Fault Fault selct > --------- ------------- ------ ------ ------ ------ ------- ----- ------- ----- > localhost Linux 2.6.27- 15.1 13.4 45.6 25.4 24.0K 0.384 0.23850 2.804 <---!!! > localhost Linux 2.6.27- 15.8 13.3 43.0 26.0 24.1K 0.401 0.25150 2.835 <----!!! > > *Local* Communication bandwidths in MB/s - bigger is better > ----------------------------------------------------------------------------- > Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem > UNIX reread reread (libc) (hand) read write > --------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- ----- > localhost Linux 2.6.27- 4814 4100 1188 2087.4 523.2 549.6 274.9 458. 523.5 > localhost Linux 2.6.27- 4811 4111 1219 2090.8 523.1 549.4 276.1 458. 523.5 > (END) > > > > -- > Yasunori Goto > > -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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