linux-kernel - Re: [patch ]mm/zs_malloc: Fix bit spinlock replacement

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Date:   Mon, 17 Oct 2016 17:15:26 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <umgwanakikbuti@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch ]mm/zs_malloc: Fix bit spinlock replacement

On 2016-10-16 05:18:03 [+0200], Mike Galbraith wrote:
> 
> Do not alter HANDLE_SIZE, memory corruption ensues.  The handle is
> a pointer, allocate space for the struct it points to and align it
> ZS_ALIGN.  Also, when accessing the struct, mask HANDLE_PIN_BIT.

So this is to merged / folded into "mm/zsmalloc: Use get/put_cpu_light
in zs_map_object()/zs_unmap_object()" which I re-did for v4.8?
How was this tested?
I have:
   CONFIG_FRONTSWAP=y
   # CONFIG_CMA is not set
   CONFIG_ZSWAP=y
   CONFIG_ZPOOL=y
   CONFIG_ZBUD=m
   CONFIG_Z3FOLD=m
   CONFIG_ZSMALLOC=m
   # CONFIG_PGTABLE_MAPPING is not set
   CONFIG_ZSMALLOC_STAT=y

and

   # cat /sys/module/zswap/parameters/enabled
   Y
   cat /sys/module/zswap/parameters/zpool
   zbud
   # cat /sys/module/zswap/parameters/compressor 
   lzo
   # cat /sys/module/zswap/parameters/max_pool_percent 
   20

and I do have 1GiB of swap on /dev/vdc. While I get swap to be used, I
see no firework. Is there something wrong with my setup? I would assume
so due to the lack of the fireworks on my side…

> Signed-off-by: Mike Galbraith <umgwanakikbuti@...il.com>

Sebastian