linux-kernel - Re: + zram-support-compaction.patch added to -mm tree

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Date:	Thu, 5 Mar 2015 09:18:45 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	minchan@...nel.org
Cc:	ddstreet@...e.org, gunho.lee@....com, iamjoonsoo.kim@....com,
	jmarchan@...hat.com, juno.choi@....com, mel@....ul.ie,
	ngupta@...are.org, semenzato@...gle.com,
	sergey.senozhatsky@...il.com, sjennings@...iantweb.net,
	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: + zram-support-compaction.patch added to -mm tree

Hello,

On (03/04/15 14:02), akpm@...ux-foundation.org wrote:
[..]
> +++ a/drivers/block/zram/zram_drv.c
> @@ -70,6 +70,27 @@ static inline struct zram *dev_to_zram(s
>  	return (struct zram *)dev_to_disk(dev)->private_data;
>  }
>  
> +static ssize_t compact_store(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t len)
> +{
> +	unsigned long nr_migrated;
> +	struct zram *zram = dev_to_zram(dev);
> +	struct zram_meta *meta;
> +
> +	down_read(&zram->init_lock);
> +	if (!init_done(zram)) {
> +		up_read(&zram->init_lock);
> +		return -EINVAL;
> +	}
> +
> +	meta = zram->meta;
> +	nr_migrated = zs_compact(meta->mem_pool);
> +	atomic64_add(nr_migrated, &zram->stats.num_migrated);
> +	up_read(&zram->init_lock);
> +
> +	return len;
> +}
> +
>  /* flag operations require table entry bit_spin_lock() being held */
>  static int zram_test_flag(struct zram_meta *meta, u32 index,
>  			enum zram_pageflags flag)


let's stick to "helpers, attrs show/store, mm (meta, page), IO, zram control"
function layout.

so can we please put compact_store() after, say,
	354 static ssize_t comp_algorithm_store(...)

function?

	-ss

> @@ -374,6 +395,7 @@ ZRAM_ATTR_RO(invalid_io);
>  ZRAM_ATTR_RO(notify_free);
>  ZRAM_ATTR_RO(zero_pages);
>  ZRAM_ATTR_RO(compr_data_size);
> +ZRAM_ATTR_RO(num_migrated);
>  
>  static inline bool zram_meta_get(struct zram *zram)
>  {
> @@ -1031,6 +1053,7 @@ static const struct block_device_operati
>  	.owner = THIS_MODULE
>  };
>  
> +static DEVICE_ATTR_WO(compact);
>  static DEVICE_ATTR_RW(disksize);
>  static DEVICE_ATTR_RO(initstate);
>  static DEVICE_ATTR_WO(reset);
> @@ -1049,6 +1072,8 @@ static struct attribute *zram_disk_attrs
>  	&dev_attr_num_writes.attr,
>  	&dev_attr_failed_reads.attr,
>  	&dev_attr_failed_writes.attr,
> +	&dev_attr_num_migrated.attr,
> +	&dev_attr_compact.attr,
>  	&dev_attr_invalid_io.attr,
>  	&dev_attr_notify_free.attr,
>  	&dev_attr_zero_pages.attr,
> diff -puN drivers/block/zram/zram_drv.h~zram-support-compaction drivers/block/zram/zram_drv.h
> --- a/drivers/block/zram/zram_drv.h~zram-support-compaction
> +++ a/drivers/block/zram/zram_drv.h
> @@ -78,6 +78,7 @@ struct zram_stats {
>  	atomic64_t compr_data_size;	/* compressed size of pages stored */
>  	atomic64_t num_reads;	/* failed + successful */
>  	atomic64_t num_writes;	/* --do-- */
> +	atomic64_t num_migrated;	/* no. of migrated object */
>  	atomic64_t failed_reads;	/* can happen when memory is too low */
>  	atomic64_t failed_writes;	/* can happen when memory is too low */
>  	atomic64_t invalid_io;	/* non-page-aligned I/O requests */
> _
> 
> Patches currently in -mm which might be from minchan@...nel.org are
> 
> mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
> mm-page_isolation-check-pfn-validity-before-access.patch
> mm-support-madvisemadv_free.patch
> mm-support-madvisemadv_free-fix.patch
> x86-add-pmd_-for-thp.patch
> x86-add-pmd_-for-thp-fix.patch
> sparc-add-pmd_-for-thp.patch
> sparc-add-pmd_-for-thp-fix.patch
> powerpc-add-pmd_-for-thp.patch
> arm-add-pmd_mkclean-for-thp.patch
> arm64-add-pmd_-for-thp.patch
> mm-dont-split-thp-page-when-syscall-is-called.patch
> mm-dont-split-thp-page-when-syscall-is-called-fix.patch
> mm-dont-split-thp-page-when-syscall-is-called-fix-2.patch
> zram-cosmetic-zram_attr_ro-code-formatting-tweak.patch
> zram-use-idr-instead-of-zram_devices-array.patch
> zram-factor-out-device-reset-from-reset_store.patch
> zram-reorganize-code-layout.patch
> zram-add-dynamic-device-add-remove-functionality.patch
> zram-remove-max_num_devices-limitation.patch
> zram-report-every-added-and-removed-device.patch
> zram-trivial-correct-flag-operations-comment.patch
> zsmalloc-decouple-handle-and-object.patch
> zsmalloc-factor-out-obj_.patch
> zsmalloc-support-compaction.patch
> zsmalloc-adjust-zs_almost_full.patch
> zram-support-compaction.patch
> zsmalloc-record-handle-in-page-private-for-huge-object.patch
> zsmalloc-add-fullness-into-stat.patch
> 
> --
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