2010-09-23 01:11:00 rootfs size

svs k (INDIA)

Message: 93775

Hi all,

I m currently using initramfs for rootfs. My application executable file in rootfs totally is around 5 M size. I thought after running the application if the executable is deleted, free memory would increase. I was able to delete the file after the application is launched. but i could not find any change in the free memory still. Kindly tell me why this happens and also suggest is there a way to increase the free memory by removing this executable.

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2010-09-23 01:45:57 Re: rootfs size

Mike Sinkovsky (RUSSIAN FEDERATION)

Message: 93776

I think real question here - does initramfs filesystem support XIP?

If yes, no need to delete file for freeng memory, application file running application will use same memory..

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2010-09-23 02:14:18 Re: rootfs size

Mike Frysinger (UNITED STATES)

Message: 93777

all ramfs filesystems should allow direct mapping

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2010-09-23 07:37:01 Re: rootfs size

Mike Sinkovsky (RUSSIAN FEDERATION)

Message: 93798

Then XIP from initramfs in 2010R1 works by default for FDPIC ELF programms, or need some configuration?

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2010-09-23 15:20:28 Re: rootfs size

Mike Frysinger (UNITED STATES)

Message: 93806

i belive that is correct. 2010R1 has seen a lot of low level work to avoid useless copies/flushes/etc...

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2010-09-30 01:12:20 Re: rootfs size

svs k (INDIA)

Message: 93997

Sorry If i m wrong. Actually, i didnt get exactly what you mean.

I m working in 2009R1- RC7 distribution. I m trying to do memory analysis for my application.

I have an EXE file (APPL_TEST = 2.9M) and a binary file (APPL_BIN = 3.1M). bfin-linux-uclibc-size APPL_TEST returns 19MB. around. I did the following test .

Test 1:

1. TFTP the Application and Binary File, Run and Test.

Actions Taken Free Memory Used Memory(KB) Used Memory(MB)

Initial Memory 117592

After TFTP APPL_TEST 114652 2940

After TFTP APPL_BIN 111404 3248

After running the application 72060 39344 45532

remove APPL_TEST 72060 0

Clarifications:

1. After removing the APPL_TEST file after running, there is no increase in free memory. If XIP is there, I understand, total memory taken by the application after it is run, is 44M. Is my understanding right?

Kindly clarify.

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2010-09-30 01:17:13 Re: rootfs size

svs k (INDIA)

Message: 93999

Sorry in my previous question the last column in the table is actually, total used memory in KB.

Actions Taken Free Memory Used Memory(KB) Total Used Memory (KB)

Initial Memory 117592

After TFTP APPL_TEST 114652 2940

After TFTP APPL_BIN 111404 3248

After running the application 72060 39344 45532

remove APPL_TEST 72060 0