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Date:   Tue, 19 Feb 2019 11:05:38 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        "marc.zyngier@....com" <marc.zyngier@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "gkulkarni@...vell.com" <gkulkarni@...vell.com>,
        "suzuki.poulose@....com" <suzuki.poulose@....com>,
        Linuxarm <linuxarm@...wei.com>,
        "Robert.Richter@...ium.com" <Robert.Richter@...ium.com>,
        "shankerd@...eaurora.org" <shankerd@...eaurora.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v4] irqchip: gicv3-its: Use NUMA aware memory allocation
 for    ITS tables

Hi Marc,

A gentle reminder on this one...

Thanks,
Shameer

> -----Original Message-----
> From: Linuxarm [mailto:linuxarm-bounces@...wei.com] On Behalf Of Shameer
> Kolothum
> Sent: 14 January 2019 09:50
> To: marc.zyngier@....com; linux-kernel@...r.kernel.org
> Cc: gkulkarni@...vell.com; suzuki.poulose@....com; Linuxarm
> <linuxarm@...wei.com>; Robert.Richter@...ium.com;
> shankerd@...eaurora.org; linux-arm-kernel@...ts.infradead.org
> Subject: [PATCH v4] irqchip: gicv3-its: Use NUMA aware memory allocation for
> ITS tables
> 
> From: Shanker Donthineni <shankerd@...eaurora.org>
> 
> The NUMA node information is visible to ITS driver but not being used
> other than handling hardware errata. ITS/GICR hardware accesses to the
> local NUMA node is usually quicker than the remote NUMA node. How slow
> the remote NUMA accesses are depends on the implementation details.
> 
> This patch allocates memory for ITS management tables and command
> queue from the corresponding NUMA node using the appropriate NUMA
> aware functions. This change improves the performance of the ITS
> tables read latency on systems where it has more than one ITS block,
> and with the slower inter node accesses.
> 
> Apache Web server benchmarking using ab tool on a HiSilicon D06
> board with multiple numa mem nodes shows Time per request and
> Transfer rate improvements of ~3.6% with this patch.
> 
> Signed-off-by: Shanker Donthineni <shankerd@...eaurora.org>
> Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> Reviewed-by: Ganapatrao Kulkarni <gkulkarni@...vell.com>
> ---
> 
> This is to revive the patch originally sent by Shanker[1] and
> to back it up with a benchmark test. Any further testing of
> this is most welcome.
> 
> v3-->v4
> -Addressed comments on alloc_pages_node() and page_address() usage.
> -Rebased on 5.0-rc1
> -Added Ganapatrao's R-by.
> 
> v2-->v3
>  -Addressed comments to use page_address().
>  -Added Benchmark results to commit log.
>  -Removed T-by from Ganapatrao for now.
> 
> v1-->v2
>  -Edited commit text.
>  -Added Ganapatrao's tested-by.
> 
> Benchmark test details:
> --------------------------------
> Test Setup:
> -D06 with dimm on node 0(Sock#0) and 3 (Sock#1).
> -ITS belongs to numa node 0.
> -Filesystem mounted on a PCIe NVMe based disk.
> -Apache server installed on D06.
> -Running ab benchmark test in concurrency mode from a remote m/c
>  connected to D06 via  hns3(PCIe) n/w port.
>  "ab -k -c 750 -n 2000000 http://10.202.225.188/"
> 
> Test results are avg. of 15 runs.
> 
> For 4.20-rc1  Kernel,
> ----------------------------
> Time per request(mean, concurrent)  = 0.02753[ms]
> Transfer Rate = 416501[Kbytes/sec]
> 
> For 4.20-rc1 +  this patch,
> ----------------------------------
> Time per request(mean, concurrent)  = 0.02653[ms]
> Transfer Rate = 431954[Kbytes/sec]
> 
> % improvement ~3.6%
> 
> vmstat shows around 170K-200K interrupts per second.
> 
> ~# vmstat 1 -w
> procs -----------------------memory-- -  -system--
>  r  b         swpd         free            in
>  5  0            0     30166724          102794
>  9  0            0     30141828          171148
>  5  0            0     30150160          207185
> 13  0            0     30145924          175691
> 15  0            0     30140792          145250
> 13  0            0     30135556          201879
> 13  0            0     30134864          192391
> 10  0            0     30133632          168880
> ....
> 
> [1] https://patchwork.kernel.org/patch/9833339/
> 
>  drivers/irqchip/irq-gic-v3-its.c | 26 ++++++++++++++++----------
>  1 file changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index db20e99..5df59ad 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -1737,6 +1737,7 @@ static int its_setup_baser(struct its_node *its,
> struct its_baser *baser,
>  	u64 type = GITS_BASER_TYPE(val);
>  	u64 baser_phys, tmp;
>  	u32 alloc_pages;
> +	struct page *page;
>  	void *base;
> 
>  retry_alloc_baser:
> @@ -1749,10 +1750,11 @@ static int its_setup_baser(struct its_node *its,
> struct its_baser *baser,
>  		order = get_order(GITS_BASER_PAGES_MAX * psz);
>  	}
> 
> -	base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
> -	if (!base)
> +	page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
> order);
> +	if (!page)
>  		return -ENOMEM;
> 
> +	base = (void *)page_address(page);
>  	baser_phys = virt_to_phys(base);
> 
>  	/* Check if the physical address of the memory is above 48bits */
> @@ -2236,7 +2238,8 @@ static struct its_baser *its_get_baser(struct
> its_node *its, u32 type)
>  	return NULL;
>  }
> 
> -static bool its_alloc_table_entry(struct its_baser *baser, u32 id)
> +static bool its_alloc_table_entry(struct its_node *its,
> +				  struct its_baser *baser, u32 id)
>  {
>  	struct page *page;
>  	u32 esz, idx;
> @@ -2256,7 +2259,8 @@ static bool its_alloc_table_entry(struct its_baser
> *baser, u32 id)
> 
>  	/* Allocate memory for 2nd level table */
>  	if (!table[idx]) {
> -		page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
> get_order(baser->psz));
> +		page = alloc_pages_node(its->numa_node, GFP_KERNEL |
> __GFP_ZERO,
> +					get_order(baser->psz));
>  		if (!page)
>  			return false;
> 
> @@ -2287,7 +2291,7 @@ static bool its_alloc_device_table(struct its_node
> *its, u32 dev_id)
>  	if (!baser)
>  		return (ilog2(dev_id) < its->device_ids);
> 
> -	return its_alloc_table_entry(baser, dev_id);
> +	return its_alloc_table_entry(its, baser, dev_id);
>  }
> 
>  static bool its_alloc_vpe_table(u32 vpe_id)
> @@ -2311,7 +2315,7 @@ static bool its_alloc_vpe_table(u32 vpe_id)
>  		if (!baser)
>  			return false;
> 
> -		if (!its_alloc_table_entry(baser, vpe_id))
> +		if (!its_alloc_table_entry(its, baser, vpe_id))
>  			return false;
>  	}
> 
> @@ -2345,7 +2349,7 @@ static struct its_device *its_create_device(struct
> its_node *its, u32 dev_id,
>  	nr_ites = max(2, nvecs);
>  	sz = nr_ites * its->ite_size;
>  	sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
> -	itt = kzalloc(sz, GFP_KERNEL);
> +	itt = kzalloc_node(sz, GFP_KERNEL, its->numa_node);
>  	if (alloc_lpis) {
>  		lpi_map = its_lpi_alloc(nvecs, &lpi_base, &nr_lpis);
>  		if (lpi_map)
> @@ -3486,6 +3490,7 @@ static int __init its_probe_one(struct resource *res,
>  	void __iomem *its_base;
>  	u32 val, ctlr;
>  	u64 baser, tmp, typer;
> +	struct page *page;
>  	int err;
> 
>  	its_base = ioremap(res->start, resource_size(res));
> @@ -3541,12 +3546,13 @@ static int __init its_probe_one(struct resource
> *res,
> 
>  	its->numa_node = numa_node;
> 
> -	its->cmd_base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
> -						get_order(ITS_CMD_QUEUE_SZ));
> -	if (!its->cmd_base) {
> +	page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
> +				get_order(ITS_CMD_QUEUE_SZ));
> +	if (!page) {
>  		err = -ENOMEM;
>  		goto out_free_its;
>  	}
> +	its->cmd_base = (void *)page_address(page);
>  	its->cmd_write = its->cmd_base;
>  	its->fwnode_handle = handle;
>  	its->get_msi_base = its_irq_get_msi_base;
> --
> 2.7.4
> 
> 
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