* Memory usage?
@ 2002-10-14 8:13 Steve Tsai
2002-10-14 16:34 ` Russ Dill
0 siblings, 1 reply; 6+ messages in thread
From: Steve Tsai @ 2002-10-14 8:13 UTC (permalink / raw
To: Linux MTD mailing list
Does JFFS2 will allocate large memory to read big file? I have a 128M
bytes nand flash on my board and there is a large file about 12M bytes.
After I use the testing program to read the file, the free memory
reduce to 312Kbytes (from 10660Kbytes). How can I reduce the memory
usage of JFFS2? Thanks.
Steve Tsai
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Memory usage?
2002-10-14 8:13 Memory usage? Steve Tsai
@ 2002-10-14 16:34 ` Russ Dill
2002-10-15 4:11 ` Steve Tsai
0 siblings, 1 reply; 6+ messages in thread
From: Russ Dill @ 2002-10-14 16:34 UTC (permalink / raw
To: Steve Tsai; +Cc: Linux MTD mailing list
On Mon, 2002-10-14 at 01:13, Steve Tsai wrote:
> Does JFFS2 will allocate large memory to read big file? I have a 128M
> bytes nand flash on my board and there is a large file about 12M bytes.
> After I use the testing program to read the file, the free memory
> reduce to 312Kbytes (from 10660Kbytes). How can I reduce the memory
> usage of JFFS2? Thanks.
what do you mean by "free memory", are you including buffers and cache?
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: Memory usage?
2002-10-14 16:34 ` Russ Dill
@ 2002-10-15 4:11 ` Steve Tsai
2002-10-15 6:28 ` David Woodhouse
0 siblings, 1 reply; 6+ messages in thread
From: Steve Tsai @ 2002-10-15 4:11 UTC (permalink / raw
To: 'Russ Dill'; +Cc: Linux MTD mailing list
It does not include cache and buffer. I know the most memory becomes the
cache, but I am using uClinux and the lower MemFree will cause system
crash when I am loading program. I need to prevent the case.
Steve Tsai
> -----Original Message-----
> From: Russ Dill [mailto:Russ.Dill@asu.edu]
> Sent: Tuesday, October 15, 2002 12:35 AM
> To: Steve Tsai
> Cc: Linux MTD mailing list
> Subject: Re: Memory usage?
>
>
> On Mon, 2002-10-14 at 01:13, Steve Tsai wrote:
> > Does JFFS2 will allocate large memory to read big file? I
> have a 128M
> > bytes nand flash on my board and there is a large file about 12M
> > bytes. After I use the testing program to read the file, the free
> > memory reduce to 312Kbytes (from 10660Kbytes). How can I reduce the
> > memory usage of JFFS2? Thanks.
>
> what do you mean by "free memory", are you including buffers
> and cache?
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Memory usage?
2002-10-15 4:11 ` Steve Tsai
@ 2002-10-15 6:28 ` David Woodhouse
2002-10-15 12:05 ` [power-saving issue] ??
2002-10-15 12:56 ` David Woodhouse
0 siblings, 2 replies; 6+ messages in thread
From: David Woodhouse @ 2002-10-15 6:28 UTC (permalink / raw
To: Steve Tsai; +Cc: 'Russ Dill', Linux MTD mailing list
startec@ms11.hinet.net said:
> It does not include cache and buffer. I know the most memory becomes
> the cache, but I am using uClinux and the lower MemFree will cause
> system crash when I am loading program. I need to prevent the case.
grep jffs2 /proc/slabinfo
--
dwmw2
^ permalink raw reply [flat|nested] 6+ messages in thread
* [power-saving issue]
2002-10-15 6:28 ` David Woodhouse
@ 2002-10-15 12:05 ` ??
2002-10-15 12:56 ` David Woodhouse
1 sibling, 0 replies; 6+ messages in thread
From: ?? @ 2002-10-15 12:05 UTC (permalink / raw
To: David Woodhouse; +Cc: Linux MTD mailing list
dear all,
we want to stop gc thread manually when system goto suspend mode,
can we simply call "jffs2_stop_garbage_collect_thread()"?
and how to get its param: "struct jffs2_sb_info *c"
btw, i think gc thread wakeup only if its necessary not regularly, right?
best regards,
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [power-saving issue]
2002-10-15 6:28 ` David Woodhouse
2002-10-15 12:05 ` [power-saving issue] ??
@ 2002-10-15 12:56 ` David Woodhouse
1 sibling, 0 replies; 6+ messages in thread
From: David Woodhouse @ 2002-10-15 12:56 UTC (permalink / raw
To: ??; +Cc: Linux MTD mailing list
kevin@gv.com.tw said:
> we want to stop gc thread manually when system goto suspend mode,
> can we simply call "jffs2_stop_garbage_collect_thread()"? and how to
> get its param: "struct jffs2_sb_info *c"
Send it a SIGSTOP from userspace, then a SIGCONT when you want it to wake
up. Or send it a SIGKILL to kill it permanently (until the next remount).
> btw, i think gc thread wakeup only if its necessary not regularly,
> right?
Correct.
--
dwmw2
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2002-10-15 12:57 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2002-10-14 8:13 Memory usage? Steve Tsai
2002-10-14 16:34 ` Russ Dill
2002-10-15 4:11 ` Steve Tsai
2002-10-15 6:28 ` David Woodhouse
2002-10-15 12:05 ` [power-saving issue] ??
2002-10-15 12:56 ` David Woodhouse
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