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Message-ID: <20140813233254.GF9227@bbox> Date: Thu, 14 Aug 2014 08:32:54 +0900 From: Minchan Kim <minchan@...nel.org> To: Seth Jennings <sjennings@...iantweb.net> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Jerome Marchand <jmarchan@...hat.com>, juno.choi@....com, seungho1.park@....com, Luigi Semenzato <semenzato@...gle.com>, Nitin Gupta <ngupta@...are.org> Subject: Re: [RFC 0/3] zram memory control enhance On Wed, Aug 13, 2014 at 10:34:22AM -0500, Seth Jennings wrote: > On Tue, Aug 05, 2014 at 05:02:00PM +0900, Minchan Kim wrote: > > Notice! It's RFC. I didn't test at all but wanted to hear opinion > > during merge window when it's really busy time for Andrew so we could > > use the slack time to discuss without hurting him. ;-) > > > > Patch 1 is to move pages_allocated in zsmalloc from size_class to zs_pool > > so zs_get_total_size_bytes of zsmalloc would be faster than old. > > zs_get_total_size_bytes could be used next patches frequently. > > > > Patch 2 adds new feature which exports how many of bytes zsmalloc consumes > > during testing workload. Normally, before fixing the zram's disksize > > we have tested various workload and wanted to how many of bytes zram > > consumed. > > For it, we could poll mem_used_total of zram in userspace but the problem is > > when memory pressure is severe and heavy swap out happens suddenly then > > heavy swapin or exist while polling interval of user space is a few second, > > it could miss max memory size zram had consumed easily. > > With lack of information, user can set wrong disksize of zram so the result > > is OOM. So this patch adds max_mem_used for zram and zsmalloc supports it > > > > Patch 3 is to limit zram memory consumption. Now, zram has no bound for > > memory usage so it could consume up all of system memory. It makes system > > memory control for platform hard so I have heard the feature several time. > > > > Feedback is welcome! > > One thing you might consider doing is moving zram to use the new zpool > API. That way, when making changes that effect the zsmalloc API, > consideration for zpool, and by extension, zpool users like zswap are > also taken into account. Now, it's rather overkill for zram. > > Seth > > > > > Minchan Kim (3): > > zsmalloc: move pages_allocated to zs_pool > > zsmalloc/zram: add zs_get_max_size_bytes and use it in zram > > zram: limit memory size for zram > > > > Documentation/blockdev/zram.txt | 2 ++ > > drivers/block/zram/zram_drv.c | 58 +++++++++++++++++++++++++++++++++++++++++ > > drivers/block/zram/zram_drv.h | 1 + > > include/linux/zsmalloc.h | 1 + > > mm/zsmalloc.c | 50 +++++++++++++++++++++++++---------- > > 5 files changed, 98 insertions(+), 14 deletions(-) > > > > -- > > 2.0.0 > > > > -- > > To unsubscribe, send a message with 'unsubscribe linux-mm' in > > the body to majordomo@...ck.org. For more info on Linux MM, > > see: http://www.linux-mm.org/ . > > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a> > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@...ck.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a> -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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