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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id n3sm3128445wmc.27.2020.02.13.05.40.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Feb 2020 05:40:01 -0800 (PST) From: Ondrej Mosnacek To: selinux@vger.kernel.org Subject: [PATCH userspace v2] libsepol: cache ebitmap cardinality value Date: Thu, 13 Feb 2020 14:39:59 +0100 Message-Id: <20200213133959.14217-1-omosnace@redhat.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org According to profiling of semodule -BN, ebitmap_cardinality() is called quite often and contributes a lot to the total runtime. Cache its result in the ebitmap struct to reduce this overhead. The cached value is invalidated on most modifying operations, but ebitmap_cardinality() is usually called once the ebitmap doesn't change any more. After this patch, the time to do 'semodule -BN' on Fedora Rawhide has decreased from ~14.6s to ~12.4s (2.2s saved). Signed-off-by: Ondrej Mosnacek --- v2: corrected time values in commit message libsepol/include/sepol/policydb/ebitmap.h | 1 + libsepol/src/ebitmap.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/libsepol/include/sepol/policydb/ebitmap.h b/libsepol/include/sepol/policydb/ebitmap.h index e62df01c..53fafdaa 100644 --- a/libsepol/include/sepol/policydb/ebitmap.h +++ b/libsepol/include/sepol/policydb/ebitmap.h @@ -37,6 +37,7 @@ typedef struct ebitmap_node { typedef struct ebitmap { ebitmap_node_t *node; /* first node in the bitmap */ uint32_t highbit; /* highest position in the total bitmap */ + unsigned int cardinality; /* cached value of cardinality */ } ebitmap_t; #define ebitmap_length(e) ((e)->highbit) diff --git a/libsepol/src/ebitmap.c b/libsepol/src/ebitmap.c index 6c9951b7..d23444ce 100644 --- a/libsepol/src/ebitmap.c +++ b/libsepol/src/ebitmap.c @@ -67,6 +67,7 @@ int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1) ebitmap_destroy(dst); dst->node = tmp.node; dst->highbit = tmp.highbit; + dst->cardinality = 0; return 0; } @@ -128,9 +129,14 @@ int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int ma unsigned int ebitmap_cardinality(ebitmap_t *e1) { unsigned int i, count = 0; + + if (e1->cardinality || e1->highbit == 0) + return e1->cardinality; + for (i=ebitmap_startbit(e1); i < ebitmap_length(e1); i++) if (ebitmap_get_bit(e1, i)) count++; + e1->cardinality = count; return count; } @@ -194,6 +200,7 @@ int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src) } dst->highbit = src->highbit; + dst->cardinality = src->cardinality; return 0; } @@ -309,6 +316,7 @@ int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value) free(n); } } + e->cardinality = 0; /* invalidate cached cardinality */ return 0; } prev = n; @@ -339,6 +347,7 @@ int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value) e->node = new; } + e->cardinality = 0; /* invalidate cached cardinality */ return 0; } @@ -358,6 +367,7 @@ void ebitmap_destroy(ebitmap_t * e) e->highbit = 0; e->node = 0; + e->cardinality = 0; return; } -- 2.24.1