Date: Sat, 21 Aug 1999 11:10:14 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Wes Peters <wes@softweyr.com> Cc: hackers@FreeBSD.ORG Subject: Re: mmap mapped segment length Message-ID: <199908211810.LAA13809@lestat.nas.nasa.gov>
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On Sat, 21 Aug 1999 02:10:47 -0600 Wes Peters <wes@softweyr.com> wrote: > I discovered to my dismay today that the length field in the mmap call is > a size_t, not an off_t. I was attempting to process a large (~50 MByte) file > and found I was only processing the first 4 MBytes of it. ...first of all, I assume you mean GByte, not MByte. The type of the "len" argument is specified by multiple standards. You could change size_t to a 64-bit quantity, but then you have: (1) A serious ABI incompatibility issue with the rest of the x86 world. (2) You'd have to go to 64-bit arithmetic everywhere in the VM code which could seriously impact performance. > Is this intentional, or just an artifact of the implementation? Is there any > reason NOT to change this to an off_t? -- Jason R. Thorpe <thorpej@nas.nasa.gov> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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