linux-kernel - Re: [PATCH RFC] mm: rework virtual memory accounting

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Message-ID: <20151214090827.GA14045@uranus>
Date:	Mon, 14 Dec 2015 12:08:27 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Konstantin Khlebnikov <koct9i@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH RFC] mm: rework virtual memory accounting

On Mon, Dec 14, 2015 at 11:12:38AM +0300, Konstantin Khlebnikov wrote:
> Here several rated changes bundled together:
> * keep vma counting if CONFIG_PROC_FS=n, will be used for limits
> * replace mm->shared_vm with better defined mm->data_vm
> * account anonymous executable areas as executable
> * account file-backed growsdown/up areas as stack
> * drop struct file* argument from vm_stat_account
> * enforce RLIMIT_DATA for size of data areas
> 
> This way code looks cleaner: now code/stack/data
> classification depends only on vm_flags state:
> 
> VM_EXEC & ~VM_WRITE -> code (VmExe + VmLib in proc)
> VM_GROWSUP | VM_GROWSDOWN -> stack (VmStk)
> VM_WRITE & ~VM_SHARED & !stack -> data (VmData)
> 
> The rest (VmSize - VmData - VmStk - VmExe - VmLib) could be called "shared",
> but that might be strange beasts like readonly-private or VM_IO areas.
> 
> RLIMIT_AS limits whole address space "VmSize"
> RLIMIT_STACK limits stack "VmStk" (but each vma individually)
> RLIMIT_DATA now limits "VmData"
> 
> Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>

Looks OK to me. Lets wait for Linus' opinion.
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