From: PINTU KUMAR <pintu.k@samsung.com>
To: "'David Rientjes'" <rientjes@google.com>
Cc: akpm@linux-foundation.org, riel@redhat.com, aquini@redhat.com,
        paul.gortmaker@windriver.com, jmarchan@redhat.com,
        lcapitulino@redhat.com, kirill.shutemov@linux.intel.com,
        m.szyprowski@samsung.com, aneesh.kumar@linux.vnet.ibm.com,
        iamjoonsoo.kim@lge.com, mina86@mina86.com, lauraa@codeaurora.org,
        gioh.kim@lge.com, mgorman@suse.de, hannes@cmpxchg.org, vbabka@suse.cz,
        sasha.levin@oracle.com, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, pintu_agarwal@yahoo.com, cpgs@samsung.com,
        vishnu.ps@samsung.com, rohit.kr@samsung.com, ed.savinay@samsung.com
References: <1413790391-31686-1-git-send-email-pintu.k@samsung.com>
 <1413986796-19732-1-git-send-email-pintu.k@samsung.com>
 <alpine.DEB.2.10.1411031556140.9845@chino.kir.corp.google.com>
In-reply-to: <alpine.DEB.2.10.1411031556140.9845@chino.kir.corp.google.com>
Subject: RE: [PATCH v2 1/2] mm: cma: split cma-reserved in dmesg log
Date: Tue, 04 Nov 2014 22:45:46 +0530
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> -----Original Message-----
> From: David Rientjes [mailto:rientjes@google.com]
> Sent: Tuesday, November 04, 2014 5:27 AM
> To: Pintu Kumar
> Cc: akpm@linux-foundation.org; riel@redhat.com; aquini@redhat.com;
> paul.gortmaker@windriver.com; jmarchan@redhat.com;
> lcapitulino@redhat.com; kirill.shutemov@linux.intel.com;
> m.szyprowski@samsung.com; aneesh.kumar@linux.vnet.ibm.com;
> iamjoonsoo.kim@lge.com; mina86@mina86.com; lauraa@codeaurora.org;
> gioh.kim@lge.com; mgorman@suse.de; hannes@cmpxchg.org; vbabka@suse.cz;
> sasha.levin@oracle.com; linux-kernel@vger.kernel.org; linux-mm@kvack.org;
> pintu_agarwal@yahoo.com; cpgs@samsung.com; vishnu.ps@samsung.com;
> rohit.kr@samsung.com; ed.savinay@samsung.com
> Subject: Re: [PATCH v2 1/2] mm: cma: split cma-reserved in dmesg log
> 
> On Wed, 22 Oct 2014, Pintu Kumar wrote:
> 
> > diff --git a/include/linux/cma.h b/include/linux/cma.h index
> > 0430ed0..0b75896 100644
> > --- a/include/linux/cma.h
> > +++ b/include/linux/cma.h
> > @@ -15,6 +15,7 @@
> >
> >  struct cma;
> >
> > +extern unsigned long totalcma_pages;
> >  extern phys_addr_t cma_get_base(struct cma *cma);  extern unsigned
> > long cma_get_size(struct cma *cma);
> >
> > diff --git a/mm/cma.c b/mm/cma.c
> > index 963bc4a..8435762 100644
> > --- a/mm/cma.c
> > +++ b/mm/cma.c
> > @@ -288,6 +288,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
> >  	if (ret)
> >  		goto err;
> >
> > +	totalcma_pages += (size / PAGE_SIZE);
> >  	pr_info("Reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
> >  		(unsigned long)base);
> >  	return 0;
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c index dd73f9a..ababbd8
> > 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -110,6 +110,7 @@ static DEFINE_SPINLOCK(managed_page_count_lock);
> >
> >  unsigned long totalram_pages __read_mostly;  unsigned long
> > totalreserve_pages __read_mostly;
> > +unsigned long totalcma_pages __read_mostly;
> 
> Shouldn't this be __initdata instead?
> 

No, we wanted to retain this variable for later use. 
We wanted to use this to print CMA info in /proc/meminfo.
Please see the next patch for this set.
[PATCH v2 2/2] fs: proc: Include cma info in proc/meminfo


> >  /*
> >   * When calculating the number of globally allowed dirty pages, there
> >   * is a certain number of per-zone reserves that should not be @@
> > -5520,7 +5521,7 @@ void __init mem_init_print_info(const char *str)
> >
> >  	pr_info("Memory: %luK/%luK available "
> >  	       "(%luK kernel code, %luK rwdata, %luK rodata, "
> > -	       "%luK init, %luK bss, %luK reserved"
> > +	       "%luK init, %luK bss, %luK reserved, %luK cma-reserved"
> >  #ifdef	CONFIG_HIGHMEM
> >  	       ", %luK highmem"
> >  #endif
> > @@ -5528,7 +5529,8 @@ void __init mem_init_print_info(const char *str)
> >  	       nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10),
> >  	       codesize >> 10, datasize >> 10, rosize >> 10,
> >  	       (init_data_size + init_code_size) >> 10, bss_size >> 10,
> > -	       (physpages - totalram_pages) << (PAGE_SHIFT-10),
> > +	       (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10),
> > +	       totalcma_pages << (PAGE_SHIFT-10),
> >  #ifdef	CONFIG_HIGHMEM
> >  	       totalhigh_pages << (PAGE_SHIFT-10),  #endif

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