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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1032; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1032.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" Compute the value using straight division and bounds, rather than a loop. Pass in tb_size rather than reading from tcg_init_ctx.code_gen_buffer_size, Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Luis Pires --- tcg/region.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/tcg/region.c b/tcg/region.c index bd81b35359..b44246e1aa 100644 --- a/tcg/region.c +++ b/tcg/region.c @@ -363,38 +363,33 @@ void tcg_region_reset_all(void) tcg_region_tree_reset_all(); } =20 -static size_t tcg_n_regions(unsigned max_cpus) +static size_t tcg_n_regions(size_t tb_size, unsigned max_cpus) { #ifdef CONFIG_USER_ONLY return 1; #else + size_t n_regions; + /* * It is likely that some vCPUs will translate more code than others, * so we first try to set more regions than max_cpus, with those regio= ns * being of reasonable size. If that's not possible we make do by even= ly * dividing the code_gen_buffer among the vCPUs. */ - size_t i; - /* Use a single region if all we have is one vCPU thread */ if (max_cpus =3D=3D 1 || !qemu_tcg_mttcg_enabled()) { return 1; } =20 - /* Try to have more regions than max_cpus, with each region being >=3D= 2 MB */ - for (i =3D 8; i > 0; i--) { - size_t regions_per_thread =3D i; - size_t region_size; - - region_size =3D tcg_init_ctx.code_gen_buffer_size; - region_size /=3D max_cpus * regions_per_thread; - - if (region_size >=3D 2 * 1024u * 1024) { - return max_cpus * regions_per_thread; - } + /* + * Try to have more regions than max_cpus, with each region being >=3D= 2 MB. + * If we can't, then just allocate one region per vCPU thread. + */ + n_regions =3D tb_size / (2 * MiB); + if (n_regions <=3D max_cpus) { + return max_cpus; } - /* If we can't, then just allocate one region per vCPU thread */ - return max_cpus; + return MIN(n_regions, max_cpus * 8); #endif } =20 @@ -828,7 +823,7 @@ void tcg_region_init(size_t tb_size, int splitwx, unsig= ned max_cpus) buf =3D tcg_init_ctx.code_gen_buffer; total_size =3D tcg_init_ctx.code_gen_buffer_size; page_size =3D qemu_real_host_page_size; - n_regions =3D tcg_n_regions(max_cpus); + n_regions =3D tcg_n_regions(total_size, max_cpus); =20 /* The first region will be 'aligned - buf' bytes larger than the othe= rs */ aligned =3D QEMU_ALIGN_PTR_UP(buf, page_size); --=20 2.25.1