Messages in this thread |  | | From | (Linus Torvalds) | Subject | Re: File System Performance | Date | Mon, 12 Nov 2001 21:48:28 +0000 (UTC) |
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In article <3BF04289.8FC8B7B7@zip.com.au>, Andrew Morton <akpm@zip.com.au> wrote: > >It's tar. It cheats. It somehow detects that the >output is /dev/null, and so it doesn't read the input files.
Probably the kernel.
If you do a mmap()+write(), the write() to /dev/null won't even read the mmap contents, which in turn will cause the pages to never be brought in.
Anything which uses mmap+write will show this.
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