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Re: [Question] New mmap64 syscall?

From: Florian Weimer <fweimer at redhat dot com>
To: Yury Norov <ynorov at caviumnetworks dot com>, libc-alpha at sourceware dot org, linux-arch at vger dot kernel dot org, linux-kernel at vger dot kernel dot org
Cc: Catalin Marinas <catalin dot marinas at arm dot com>, szabolcs dot nagy at arm dot com, heiko dot carstens at de dot ibm dot com, cmetcalf at ezchip dot com, philipp dot tomsich at theobroma-systems dot com, joseph at codesourcery dot com, zhouchengming1 at huawei dot com, Prasun dot Kapoor at caviumnetworks dot com, agraf at suse dot de, geert at linux-m68k dot org, kilobyte at angband dot pl, manuel dot montezelo at gmail dot com, arnd at arndb dot de, pinskia at gmail dot com, linyongting at huawei dot com, klimov dot linux at gmail dot com, broonie at kernel dot org, bamvor dot zhangjian at huawei dot com, linux-arm-kernel at lists dot infradead dot org, maxim dot kuvyrkov at linaro dot org, Nathan_Lynch at mentor dot com, schwidefsky at de dot ibm dot com, davem at davemloft dot net, christoph dot muellner at theobroma-systems dot com
Date: Wed, 7 Dec 2016 14:23:55 +0100
Subject: Re: [Question] New mmap64 syscall?
Authentication-results: sourceware.org; auth=none
References: <20161206185440.GA4654@yury-N73SV>

On 12/06/2016 07:54 PM, Yury Norov wrote:

3. Introduce new mmap64() syscall like this:
sys_mmap64(void *addr, size_t len, int prot, int flags, int fd, struct off_pair *off);
(The pointer here because otherwise we have 7 args, if simply pass off_hi and
off_lo in registers.)

I would prefer a batched mmap/munmap/mremap/mprotect/madvise interface,so that VM changes can be coalesced and the output reduced. Thisinterface could then be used to implement mmap on 32-bit architecturesas well because the offset restrictions would not apply there.


Thanks,
Florian

Follow-Ups:
- Re: [Question] New mmap64 syscall?
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References:
- [Question] New mmap64 syscall?
  - From: Yury Norov

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