linux-kernel - Re: [PATCH] mm/zblock: use vmalloc for page allocations

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Message-ID: <q52ddqgi42mgknla4y6i5l65nj57qck6vuuruwcm6lpez7bxmp@3luv4iwjppa6>
Date: Sun, 4 May 2025 15:14:38 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Vitaly Wool <vitaly.wool@...sulko.se>, 
	Igor Belousov <igor.b@...dev.am>
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, 
	linux-kernel@...r.kernel.org, Nhat Pham <nphamcs@...il.com>, 
	Shakeel Butt <shakeel.butt@...ux.dev>, Johannes Weiner <hannes@...xchg.org>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, Minchan Kim <minchan@...nel.org>, 
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH] mm/zblock: use vmalloc for page allocations

On (25/05/04 14:02), Sergey Senozhatsky wrote:
> On (25/05/03 20:46), Vitaly Wool wrote:
> > > Right, and it looks like this:
> > > 
> > > [  762.499278]  bug_handler+0x0/0xa8
> > > [  762.499433]  die_kernel_fault+0x1c4/0x36c
> > > [  762.499616]  fault_from_pkey+0x0/0x98
> > > [  762.499784]  do_translation_fault+0x3c/0x94
> > > [  762.499969]  do_mem_abort+0x44/0x94
> > > [  762.500140]  el1_abort+0x40/0x64
> > > [  762.500306]  el1h_64_sync_handler+0xa4/0x120
> > > [  762.500502]  el1h_64_sync+0x6c/0x70
> > > [  762.500718]  __pi_memcpy_generic+0x1e4/0x22c (P)
> > > [  762.500931]  zs_zpool_obj_write+0x10/0x1c
> > > [  762.501117]  zpool_obj_write+0x18/0x24
> > > [  762.501305]  zswap_store+0x490/0x7c4
> > > [  762.501474]  swap_writepage+0x260/0x448
> > > [  762.501654]  pageout+0x148/0x340
> > > [  762.501816]  shrink_folio_list+0xa7c/0xf34
> > > [  762.502008]  shrink_lruvec+0x6fc/0xbd0
> > > [  762.502189]  shrink_node+0x52c/0x960
> > > [  762.502359]  balance_pgdat+0x344/0x738
> > > [  762.502537]  kswapd+0x210/0x37c
> > > [  762.502691]  kthread+0x12c/0x204
> > > [  762.502920]  ret_from_fork+0x10/0x20
> > 
> > In fact we don’t know if zsmalloc is actually supposed to work with
> > 16K pages.
> 
> Hmm I think it is supposed to work, can't think of a reason why it
> shouldn't.

I'm able to repro, I think.  Will try to take a look later today/tonight.
Thank you for the report.

// Feel free to send a patch if you have a fix already.