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b=XZorzDkkFgRxREpwnq3eFbrbpYQYTpiJWBwxZnQwQjk+kpFhkW4uaZhIK6NqK9xXu 7afxpkHkrRZ4AXcaqxeP43g02XWkA/5VSygjZ7GALMY37ygbDa9IOns+SN9govHI2W zXDg/OIkrTnROlKylHQugR+pE5iI+79y81OsOTVy7ukRJu5M35REaKmzgAezB6IwER 4axtdXNQNXDQAAmzJslrkMf8hqrzgIbEI1ZjxobJ5rcjr9gp8pxx8GMl/8Y9hbLH+x 2T80ZwSM5JFBEiCzDxmuJt7c4Xa6Ye9CASgdtuqtipFKi1Di4x91MA41HDJl9mJBuN PngPS6ACMz9Fw== From: "Vlastimil Babka (SUSE)" Date: Mon, 15 Jun 2026 13:54:38 +0200 Subject: [PATCH v3 05/15] mm/slab: replace struct partial_context with slab_alloc_context MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260615-slab_alloc_flags-v3-5-ce1146d140fb@kernel.org> References: <20260615-slab_alloc_flags-v3-0-ce1146d140fb@kernel.org> In-Reply-To: <20260615-slab_alloc_flags-v3-0-ce1146d140fb@kernel.org> To: Harry Yoo Cc: Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , Suren Baghdasaryan , Alexei Starovoitov , Andrew Morton , Johannes Weiner , Michal Hocko , Shakeel Butt , Alexander Potapenko , Marco Elver , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, "Vlastimil Babka (SUSE)" X-Mailer: b4 0.15.2 X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E43D9120005 X-Stat-Signature: 337yfs7q9pp6k9rnby8ou5u1nmithrra X-HE-Tag: 1781524504-103230 X-HE-Meta: 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 rsHsNhK4 6xfdICwTAxgtzkrMblXTyMR/dnRwdqgfz/KKvH/Gol7So3SbErs+h65uvdbAVKnbc2gUYRxqAsz8OIX/R0eKP84/SgTCVqHM75JlrqGR53OwH/dnCKhbuGLGk7RnhT+EgU7NEHHk+claCA9Bg+uR2T68EUPJi016F4M7FzB+O/8R0P8r/VakSVOUw38wvclovxd0JOJfOsAEsbaAsCsedMihLbaaK3PqUT0v42HpJDApn8I90nwjUYgbGZTs37sbt4HN9ujiDlZu/DKC26jJZfsxf3/ehn8Pci+VG6z3Sv3+ocUvAhWB+3DimcoYjPcm1y8VeUZWMsgAObKRv1bKk06XnnNGz5l7ft+7FFQQWH6fWIAHAhAQHVlVKgr037Phiyei3yLvtEUnjQNc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Refactor get_from_partial_node(), get_from_any_partial(), get_from_partial() and ___slab_alloc(). Remove struct partial_context, which used to be more substantial but shrank as part of the sheaves conversion. Instead pass gfp_flags and pointer to the new slab_alloc_context, which together is a superset of partial_context, and alloc_flags are about to be added to slab_alloc_context as well. No functional change intended. Link: https://patch.msgid.link/20260610-slab_alloc_flags-v2-7-7190909db118@kernel.org Reviewed-by: Harry Yoo (Oracle) Reviewed-by: Hao Li Reviewed-by: Suren Baghdasaryan Signed-off-by: Vlastimil Babka (SUSE) --- mm/slub.c | 54 +++++++++++++++++++++++++----------------------------- 1 file changed, 25 insertions(+), 29 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index c53592baa027..6f6c15d796e1 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -219,12 +219,6 @@ struct slab_alloc_context { size_t orig_size; }; -/* Structure holding parameters for get_from_partial() call chain */ -struct partial_context { - gfp_t flags; - unsigned int orig_size; -}; - /* Structure holding parameters for get_partial_node_bulk() */ struct partial_bulk_context { gfp_t flags; @@ -3825,7 +3819,8 @@ static bool get_partial_node_bulk(struct kmem_cache *s, */ static void *get_from_partial_node(struct kmem_cache *s, struct kmem_cache_node *n, - struct partial_context *pc) + gfp_t gfp_flags, + const struct slab_alloc_context *ac) { struct slab *slab, *slab2; unsigned long flags; @@ -3840,7 +3835,7 @@ static void *get_from_partial_node(struct kmem_cache *s, if (!n || !n->nr_partial) return NULL; - if (gfpflags_allow_spinning(pc->flags)) + if (gfpflags_allow_spinning(gfp_flags)) spin_lock_irqsave(&n->list_lock, flags); else if (!spin_trylock_irqsave(&n->list_lock, flags)) return NULL; @@ -3848,12 +3843,12 @@ static void *get_from_partial_node(struct kmem_cache *s, struct freelist_counters old, new; - if (!pfmemalloc_match(slab, pc->flags)) + if (!pfmemalloc_match(slab, gfp_flags)) continue; if (IS_ENABLED(CONFIG_SLUB_TINY) || kmem_cache_debug(s)) { object = alloc_single_from_partial(s, n, slab, - pc->orig_size); + ac->orig_size); if (object) break; continue; @@ -3887,15 +3882,16 @@ static void *get_from_partial_node(struct kmem_cache *s, /* * Get an object from somewhere. Search in increasing NUMA distances. */ -static void *get_from_any_partial(struct kmem_cache *s, struct partial_context *pc) +static void *get_from_any_partial(struct kmem_cache *s, gfp_t gfp_flags, + const struct slab_alloc_context *ac) { #ifdef CONFIG_NUMA struct zonelist *zonelist; struct zoneref *z; struct zone *zone; - enum zone_type highest_zoneidx = gfp_zone(pc->flags); + enum zone_type highest_zoneidx = gfp_zone(gfp_flags); unsigned int cpuset_mems_cookie; - bool allow_spin = gfpflags_allow_spinning(pc->flags); + bool allow_spin = gfpflags_allow_spinning(gfp_flags); /* * The defrag ratio allows a configuration of the tradeoffs between @@ -3929,16 +3925,17 @@ static void *get_from_any_partial(struct kmem_cache *s, struct partial_context * if (allow_spin) cpuset_mems_cookie = read_mems_allowed_begin(); - zonelist = node_zonelist(mempolicy_slab_node(), pc->flags); + zonelist = node_zonelist(mempolicy_slab_node(), gfp_flags); for_each_zone_zonelist(zone, z, zonelist, highest_zoneidx) { struct kmem_cache_node *n; n = get_node(s, zone_to_nid(zone)); - if (n && cpuset_zone_allowed(zone, pc->flags) && + if (n && cpuset_zone_allowed(zone, gfp_flags) && n->nr_partial > s->min_partial) { - void *object = get_from_partial_node(s, n, pc); + void *object = get_from_partial_node(s, n, + gfp_flags, ac); if (object) { /* @@ -3960,8 +3957,8 @@ static void *get_from_any_partial(struct kmem_cache *s, struct partial_context * /* * Get an object from a partial slab */ -static void *get_from_partial(struct kmem_cache *s, int node, - struct partial_context *pc) +static void *get_from_partial(struct kmem_cache *s, int node, gfp_t flags, + const struct slab_alloc_context *ac) { int searchnode = node; void *object; @@ -3969,11 +3966,11 @@ static void *get_from_partial(struct kmem_cache *s, int node, if (node == NUMA_NO_NODE) searchnode = numa_mem_id(); - object = get_from_partial_node(s, get_node(s, searchnode), pc); - if (object || (node != NUMA_NO_NODE && (pc->flags & __GFP_THISNODE))) + object = get_from_partial_node(s, get_node(s, searchnode), flags, ac); + if (object || (node != NUMA_NO_NODE && (flags & __GFP_THISNODE))) return object; - return get_from_any_partial(s, pc); + return get_from_any_partial(s, flags, ac); } static bool has_pcs_used(int cpu, struct kmem_cache *s) @@ -4453,21 +4450,21 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, const struct slab_alloc_context *ac) { bool allow_spin = gfpflags_allow_spinning(gfpflags); + gfp_t trynode_flags; void *object; struct slab *slab; - struct partial_context pc; bool try_thisnode = true; stat(s, ALLOC_SLOWPATH); new_objects: - pc.flags = gfpflags; + trynode_flags = gfpflags; /* * When a preferred node is indicated but no __GFP_THISNODE * * 1) try to get a partial slab from target node only by having - * __GFP_THISNODE in pc.flags for get_from_partial() + * __GFP_THISNODE in trynode_flags for get_from_partial() * 2) if 1) failed, try to allocate a new slab from target node with * GPF_NOWAIT | __GFP_THISNODE opportunistically * 3) if 2) failed, retry with original gfpflags which will allow @@ -4478,17 +4475,16 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, && try_thisnode)) { if (unlikely(!allow_spin)) /* Do not upgrade gfp to NOWAIT from more restrictive mode */ - pc.flags = gfpflags | __GFP_THISNODE; + trynode_flags = gfpflags | __GFP_THISNODE; else - pc.flags = GFP_NOWAIT | __GFP_THISNODE; + trynode_flags = GFP_NOWAIT | __GFP_THISNODE; } - pc.orig_size = ac->orig_size; - object = get_from_partial(s, node, &pc); + object = get_from_partial(s, node, trynode_flags, ac); if (object) goto success; - slab = new_slab(s, pc.flags, node); + slab = new_slab(s, trynode_flags, node); if (unlikely(!slab)) { if (node != NUMA_NO_NODE && !(gfpflags & __GFP_THISNODE) -- 2.54.0