Re: [PATCH] rootfs (part 1)

[Christoph Rohland <cr@sap.com>]

Hi Linus,

On Wed, 16 May 2001, Linus Torvalds wrote:
> 
> On 16 May 2001, Christoph Rohland wrote:
>> 
>> cr:/speicher/src/u4ac9 $ ls -l mm/shmem.o*
>> -rw-r--r--    1 cr       users      154652 Mai 16 19:27 mm/shmem.o-tmpfs
>> -rw-r--r--    1 cr       users      180764 Mai 16 19:24 mm/shmem.o+tmpfs
>> cr:/speicher/src/u4ac9 $ ls -l fs/ramfs/ramfs.o
>> -rw-r--r--    1 cr       users      141452 Mai 16 19:27 fs/ramfs/ramfs.o
>> 
>> So CONFIG_TMPFS adds 26k and ramfs 140k.
> 
> What the hell are you doing? Compiling with debugging or something?

Yep, sorry that was uml with debugging info.

> The ramfs inode.o file (the only file that ramfs contains) has 376
> bytes of data and 1612 bytes of code. BYTES. The whole final object
> file with all the relocation information is
> 
> 	-rw-r--r-- 1 torvalds eng 5734 May 16 10:58 ramfs.o
> 
> but out of that 5.5kB, only 2kB are actually linked into the kernel
> and are used to _run_.

-rw-r--r--    1 root     root         8656 May 16 20:27 fs/ramfs/ramfs.o
-rw-r--r--    1 root     root        11688 May 16 20:24 mm/shmem.o-tmpfs
-rw-r--r--    1 root     root        18592 May 16 20:20 mm/shmem.o+tmpfs

That's an -ac kernel, so ramfs does accounting and is a little bigger
than yours.

So the read/write support in tmpfs is about the same size as ramfs.

Greetings
		Christoph