[{"id":3676573,"web_url":"http://patchwork.ozlabs.org/comment/3676573/","msgid":"<67c579d4-4e7e-4b3a-a2b9-7ba669664bdf@kernel.org>","date":"2026-04-13T09:00:57","subject":"Re: [patch 14/38] slub: Use prandom instead of get_cycles()","submitter":{"id":84946,"url":"http://patchwork.ozlabs.org/api/people/84946/","name":"Vlastimil Babka (SUSE)","email":"vbabka@kernel.org"},"content":"On 4/10/26 14:19, Thomas Gleixner wrote:\n> The decision whether to scan remote nodes is based on a 'random' number\n> retrieved via get_cycles(). get_cycles() is about to be removed.\n> \n> There is already prandom state in the code, so use that instead.\n> \n> Signed-off-by: Thomas Gleixner \n> Cc: Vlastimil Babka \n> Cc: linux-mm@kvack.org\n\nLGTM.\n\nAcked-by: Vlastimil Babka (SUSE) ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=bfyW73rE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Donenfeld\" ,\n Richard Henderson ,\n linux-alpha@vger.kernel.org, Russell King ,\n linux-arm-kernel@lists.infradead.org,\n Catalin Marinas ,\n Huacai Chen , loongarch@lists.linux.dev,\n Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen , Jonas Bonn ,\n linux-openrisc@vger.kernel.org, Helge Deller ,\n linux-parisc@vger.kernel.org, Michael Ellerman ,\n linuxppc-dev@lists.ozlabs.org, Paul Walmsley ,\n linux-riscv@lists.infradead.org, Heiko Carstens ,\n linux-s390@vger.kernel.org, \"David S. Miller\" ,\n sparclinux@vger.kernel.org, \"Harry Yoo (Oracle)\" ,\n Hao Li ","References":"<20260410120044.031381086@kernel.org>\n <20260410120318.525653921@kernel.org>","From":"\"Vlastimil Babka (SUSE)\" ","In-Reply-To":"<20260410120318.525653921@kernel.org>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"7bit","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3676733,"web_url":"http://patchwork.ozlabs.org/comment/3676733/","msgid":"","date":"2026-04-13T09:07:01","subject":"Re: [patch 14/38] slub: Use prandom instead of get_cycles()","submitter":{"id":93129,"url":"http://patchwork.ozlabs.org/api/people/93129/","name":"Harry Yoo (Oracle)","email":"harry@kernel.org"},"content":"[Resending after fixing broken email headers]\n\nOn Fri, Apr 10, 2026 at 02:19:37PM +0200, Thomas Gleixner wrote:\n> The decision whether to scan remote nodes is based on a 'random' number\n> retrieved via get_cycles(). get_cycles() is about to be removed.\n> \n> There is already prandom state in the code, so use that instead.\n> \n> Signed-off-by: Thomas Gleixner \n> Cc: Vlastimil Babka \n> Cc: linux-mm@kvack.org\n> ---\n\nAcked-by: Harry Yoo (Oracle) \n\nIs this for this merge window?\n\nThis may conflict with upcoming changes on freelist shuffling [1]\n(not queued for slab/for-next yet though), but it should be easy to\nresolve.\n\n[Cc'ing Shengming and SLAB ALLOCATOR folks]\n[1] https://lore.kernel.org/linux-mm/20260409204352095kKWVYKtZImN59ybO6iRNj@zte.com.cn","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=G3inY+8J;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776071224;\n\tbh=cS2/Y+fD/C6Fj1LtxcJRcP0gMiu198023wVz+PX5eN8=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=G3inY+8JxkEibVwYUFszuCWlat+2WMkdb9cxQNukGQ5jOO4YosRVw/teIPjzkykJe\n\t VBaoK4GWe1nSvdZccXGItvVBbCBawDxBQYXoSn8ku3lctCl78nWa1bXrv8Cz5ii5WC\n\t gS594pXSn/PDkAlQW1x8pf1/M/IPGL/2AZ9s3tUP2y+EEht32F5HbttQfHidlVLFR9\n\t SB3RrQSSOyCGHY83n0fRRZdud5Xcyx9d8MmEOZogxSk4gxdYZjmVHZxvo/hzD3ige5\n\t KqFGmCdWJVKzfE5LlEz9DNkdZh7AXZJZD7MdmFDUG+6QJAH+W76oJ0Vl3ycqghmmEe\n\t IWEm9rwhj2q9g==","Date":"Mon, 13 Apr 2026 18:07:01 +0900","From":"\"Harry Yoo (Oracle)\" ","To":"Thomas Gleixner ","Cc":"LKML ,\n\tVlastimil Babka , linux-mm@kvack.org,\n\tArnd Bergmann , x86@kernel.org,\n\tLu Baolu , iommu@lists.linux.dev,\n\tMichael Grzeschik ,\n\tnetdev@vger.kernel.org, linux-wireless@vger.kernel.org,\n\tHerbert Xu ,\n\tlinux-crypto@vger.kernel.org, David Woodhouse ,\n\tBernie Thompson , linux-fbdev@vger.kernel.org,\n\tTheodore Tso , linux-ext4@vger.kernel.org,\n\tAndrew Morton ,\n\tUladzislau Rezki , Marco Elver ,\n\tDmitry Vyukov , kasan-dev@googlegroups.com,\n\tAndrey Ryabinin ,\n\tThomas Sailer , linux-hams@vger.kernel.org,\n\t\"Jason A. Donenfeld\" ,\n\tRichard Henderson ,\n\tlinux-alpha@vger.kernel.org, Russell King ,\n\tlinux-arm-kernel@lists.infradead.org,\n\tCatalin Marinas ,\n\tHuacai Chen , loongarch@lists.linux.dev,\n\tGeert Uytterhoeven ,\n\tlinux-m68k@lists.linux-m68k.org, Dinh Nguyen ,\n\tJonas Bonn , linux-openrisc@vger.kernel.org,\n\tHelge Deller , linux-parisc@vger.kernel.org,\n\tMichael Ellerman ,\n\tlinuxppc-dev@lists.ozlabs.org, Paul Walmsley ,\n\tlinux-riscv@lists.infradead.org, Heiko Carstens ,\n\tlinux-s390@vger.kernel.org, \"David S. Miller\" ,\n\tsparclinux@vger.kernel.org, Hao Li ,\n\tChristoph Lameter ,\n\tDavid Rientjes ,\n\tRoman Gushchin ,\n\tShengming Hu ","Subject":"Re: [patch 14/38] slub: Use prandom instead of get_cycles()","Message-ID":"","References":"<20260410120044.031381086@kernel.org>\n <20260410120318.525653921@kernel.org>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260410120318.525653921@kernel.org>","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3676776,"web_url":"http://patchwork.ozlabs.org/comment/3676776/","msgid":"<20260413210252672ZfdcegJLJtyvlYdFAUBlr@zte.com.cn>","date":"2026-04-13T13:02:52","subject":"=?utf-8?q?Re=3A_=5Bpatch_14/38=5D_slub=3A_Use_prandom_instead_of_ge?=\n\t=?utf-8?q?t=5Fcycles=28=29?=","submitter":{"id":93134,"url":"http://patchwork.ozlabs.org/api/people/93134/","name":"","email":"hu.shengming@zte.com.cn"},"content":"Harry wrote:\n> [Resending after fixing broken email headers]\n> \n> On Fri, Apr 10, 2026 at 02:19:37PM +0200, Thomas Gleixner wrote:\n> > The decision whether to scan remote nodes is based on a 'random' number\n> > retrieved via get_cycles(). get_cycles() is about to be removed.\n> > \n> > There is already prandom state in the code, so use that instead.\n> > \n> > Signed-off-by: Thomas Gleixner \n> > Cc: Vlastimil Babka \n> > Cc: linux-mm@kvack.org\n> > ---\n> \n> Acked-by: Harry Yoo (Oracle) \n> \n> Is this for this merge window?\n> \n> This may conflict with upcoming changes on freelist shuffling [1]\n> (not queued for slab/for-next yet though), but it should be easy to\n> resolve.\n> \n\nHi Harry,\n\nWould you like me to wait for this patch to land linux-next and then\nrebase and send v6 on top?\n\nThanks,\n\n--\nWith Best Regards,\nShengming\n\n> [Cc'ing Shengming and SLAB ALLOCATOR folks]\n> [1] https://lore.kernel.org/linux-mm/20260409204352095kKWVYKtZImN59ybO6iRNj@zte.com.cn\n> \n> -- \n> Cheers,\n> Harry / Hyeonggon\n> \n> > mm/slub.c | 37 +++++++++++++++++++++++--------------\n> > 1 file changed, 23 insertions(+), 14 deletions(-)\n> > \n> > --- a/mm/slub.c\n> > +++ b/mm/slub.c\n> > @@ -3302,6 +3302,25 @@ static inline struct slab *alloc_slab_pa\n> > return slab;\n> > }\n> > \n> > +#if defined(CONFIG_SLAB_FREELIST_RANDOM) || defined(CONFIG_NUMA)\n> > +static DEFINE_PER_CPU(struct rnd_state, slab_rnd_state);\n> > +\n> > +static unsigned int slab_get_prandom_state(unsigned int limit)\n> > +{\n> > + struct rnd_state *state;\n> > + unsigned int res;\n> > +\n> > + /*\n> > + * An interrupt or NMI handler might interrupt and change\n> > + * the state in the middle, but that's safe.\n> > + */\n> > + state = &get_cpu_var(slab_rnd_state);\n> > + res = prandom_u32_state(state) % limit;\n> > + put_cpu_var(slab_rnd_state);\n> > + return res;\n> > +}\n> > +#endif\n> > +\n> > #ifdef CONFIG_SLAB_FREELIST_RANDOM\n> > /* Pre-initialize the random sequence cache */\n> > static int init_cache_random_seq(struct kmem_cache *s)\n> > @@ -3365,8 +3384,6 @@ static void *next_freelist_entry(struct\n> > return (char *)start + idx;\n> > }\n> > \n> > -static DEFINE_PER_CPU(struct rnd_state, slab_rnd_state);\n> > -\n> > /* Shuffle the single linked freelist based on a random pre-computed sequence */\n> > static bool shuffle_freelist(struct kmem_cache *s, struct slab *slab,\n> > bool allow_spin)\n> > @@ -3383,15 +3400,7 @@ static bool shuffle_freelist(struct kmem\n> > if (allow_spin) {\n> > pos = get_random_u32_below(freelist_count);\n> > } else {\n> > - struct rnd_state *state;\n> > -\n> > - /*\n> > - * An interrupt or NMI handler might interrupt and change\n> > - * the state in the middle, but that's safe.\n> > - */\n> > - state = &get_cpu_var(slab_rnd_state);\n> > - pos = prandom_u32_state(state) % freelist_count;\n> > - put_cpu_var(slab_rnd_state);\n> > + pos = slab_get_prandom_state(freelist_count);\n> > }\n> > \n> > page_limit = slab->objects * s->size;\n> > @@ -3882,7 +3891,7 @@ static void *get_from_any_partial(struct\n> > * with available objects.\n> > */\n> > if (!s->remote_node_defrag_ratio ||\n> > - get_cycles() % 1024 > s->remote_node_defrag_ratio)\n> > + slab_get_prandom_state(1024) > s->remote_node_defrag_ratio)\n> > return NULL;\n> > \n> > do {\n> > @@ -7102,7 +7111,7 @@ static unsigned int\n> > \n> > /* see get_from_any_partial() for the defrag ratio description */\n> > if (!s->remote_node_defrag_ratio ||\n> > - get_cycles() % 1024 > s->remote_node_defrag_ratio)\n> > + slab_get_prandom_state(1024) > s->remote_node_defrag_ratio)\n> > return 0;\n> > \n> > do {\n> > @@ -8421,7 +8430,7 @@ void __init kmem_cache_init_late(void)\n> > flushwq = alloc_workqueue(\"slub_flushwq\", WQ_MEM_RECLAIM | WQ_PERCPU,\n> > 0);\n> > WARN_ON(!flushwq);\n> > -#ifdef CONFIG_SLAB_FREELIST_RANDOM\n> > +#if defined(CONFIG_SLAB_FREELIST_RANDOM) || defined(CONFIG_NUMA)\n> > prandom_init_once(&slab_rnd_state);\n> > #endif\n> > }\n> > \n> >","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19699-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org; arc=none smtp.remote-ip=58.251.27.85","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) 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