linux-kernel - Re: [PATCH v2] mm: add account_locked

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Date:   Wed, 29 May 2019 11:05:48 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     akpm@...ux-foundation.org, Alexey Kardashevskiy <aik@...abs.ru>,
        Alan Tull <atull@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Lameter <cl@...ux.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Davidlohr Bueso <dave@...olabs.net>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Moritz Fischer <mdf@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        Steve Sistare <steven.sistare@...cle.com>,
        Wu Hao <hao.wu@...el.com>, linux-mm@...ck.org,
        kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: add account_locked_vm utility function

On Fri, May 24, 2019 at 01:50:45PM -0400, Daniel Jordan wrote:

[snip]

> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0e8834ac32b7..72c1034d2ec7 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1564,6 +1564,25 @@ long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
>  int get_user_pages_fast(unsigned long start, int nr_pages,
>  			unsigned int gup_flags, struct page **pages);
>  
> +int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
> +			struct task_struct *task, bool bypass_rlim);
> +
> +static inline int account_locked_vm(struct mm_struct *mm, unsigned long pages,
> +				    bool inc)
> +{
> +	int ret;
> +
> +	if (pages == 0 || !mm)
> +		return 0;
> +
> +	down_write(&mm->mmap_sem);
> +	ret = __account_locked_vm(mm, pages, inc, current,
> +				  capable(CAP_IPC_LOCK));
> +	up_write(&mm->mmap_sem);
> +
> +	return ret;
> +}
> +
>  /* Container for pinned pfns / pages */
>  struct frame_vector {
>  	unsigned int nr_allocated;	/* Number of frames we have space for */
> diff --git a/mm/util.c b/mm/util.c
> index e2e4f8c3fa12..bd3bdf16a084 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -6,6 +6,7 @@
>  #include <linux/err.h>
>  #include <linux/sched.h>
>  #include <linux/sched/mm.h>
> +#include <linux/sched/signal.h>
>  #include <linux/sched/task_stack.h>
>  #include <linux/security.h>
>  #include <linux/swap.h>
> @@ -346,6 +347,51 @@ int __weak get_user_pages_fast(unsigned long start,
>  }
>  EXPORT_SYMBOL_GPL(get_user_pages_fast);
>  
> +/**
> + * __account_locked_vm - account locked pages to an mm's locked_vm
> + * @mm:          mm to account against, may be NULL

This kernel doc is wrong.  You dereference mm straight away...

> + * @pages:       number of pages to account
> + * @inc:         %true if @pages should be considered positive, %false if not
> + * @task:        task used to check RLIMIT_MEMLOCK
> + * @bypass_rlim: %true if checking RLIMIT_MEMLOCK should be skipped
> + *
> + * Assumes @task and @mm are valid (i.e. at least one reference on each), and
> + * that mmap_sem is held as writer.
> + *
> + * Return:
> + * * 0       on success
> + * * 0       if @mm is NULL (can happen for example if the task is exiting)
> + * * -ENOMEM if RLIMIT_MEMLOCK would be exceeded.
> + */
> +int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
> +			struct task_struct *task, bool bypass_rlim)
> +{
> +	unsigned long locked_vm, limit;
> +	int ret = 0;
> +
> +	locked_vm = mm->locked_vm;

here...

Perhaps the comment was meant to document account_locked_vm()?  Or should the
parameter checks be moved here?

Ira

> +	if (inc) {
> +		if (!bypass_rlim) {
> +			limit = task_rlimit(task, RLIMIT_MEMLOCK) >> PAGE_SHIFT;
> +			if (locked_vm + pages > limit)
> +				ret = -ENOMEM;
> +		}
> +		if (!ret)
> +			mm->locked_vm = locked_vm + pages;
> +	} else {
> +		WARN_ON_ONCE(pages > locked_vm);
> +		mm->locked_vm = locked_vm - pages;
> +	}
> +
> +	pr_debug("%s: [%d] caller %ps %c%lu %lu/%lu%s\n", __func__, task->pid,
> +		 (void *)_RET_IP_, (inc) ? '+' : '-', pages << PAGE_SHIFT,
> +		 locked_vm << PAGE_SHIFT, task_rlimit(task, RLIMIT_MEMLOCK),
> +		 ret ? " - exceeded" : "");
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(__account_locked_vm);
>

> +
>  unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
>  	unsigned long len, unsigned long prot,
>  	unsigned long flag, unsigned long pgoff)
> 
> base-commit: a188339ca5a396acc588e5851ed7e19f66b0ebd9
> -- 
> 2.21.0
>