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Howlett" , Matthew Wilcox , Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>, Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Vlastimil Babka Subject: [RFC v1 5/5] maple_tree: replace preallocation with slub percpu array prefill Date: Tue, 8 Aug 2023 11:53:48 +0200 Message-ID: <20230808095342.12637-12-vbabka@suse.cz> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230808095342.12637-7-vbabka@suse.cz> References: <20230808095342.12637-7-vbabka@suse.cz> MIME-Version: 1.0 X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_SOFTFAIL,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773684131501363558 X-GMAIL-MSGID: 1773684131501363558 With the percpu array we can try not doing the preallocations in maple tree, and instead make sure the percpu array is prefilled, and using GFP_ATOMIC in places that relied on the preallocation (in case we miss or fail trylock on the array), i.e. mas_store_prealloc(). For now simply add __GFP_NOFAIL there as well. First I tried to change mas_node_count_gfp() to not preallocate anything anywhere, but that lead to warns and panics, even though the other caller mas_node_count() uses GFP_NOWAIT | __GFP_NOWARN so it has no guarantees... So I changed just mas_preallocate(). I let it still to truly preallocate a single node, but maybe it's not necessary? --- lib/maple_tree.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 7a8e7c467d7c..5a209d88c318 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5534,7 +5534,12 @@ void mas_store_prealloc(struct ma_state *mas, void *entry) mas_wr_store_setup(&wr_mas); trace_ma_write(__func__, mas, 0, entry); + +retry: mas_wr_store_entry(&wr_mas); + if (unlikely(mas_nomem(mas, GFP_ATOMIC | __GFP_NOFAIL))) + goto retry; + MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas)); mas_destroy(mas); } @@ -5550,9 +5555,10 @@ EXPORT_SYMBOL_GPL(mas_store_prealloc); int mas_preallocate(struct ma_state *mas, gfp_t gfp) { int ret; + int count = 1 + mas_mt_height(mas) * 3; - mas_node_count_gfp(mas, 1 + mas_mt_height(mas) * 3, gfp); - mas->mas_flags |= MA_STATE_PREALLOC; + mas_node_count_gfp(mas, 1, gfp); + kmem_cache_prefill_percpu_array(maple_node_cache, count, gfp); if (likely(!mas_is_err(mas))) return 0;