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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jamill@microsoft.com; x-microsoft-antispam-message-info: 7wEHlQ1GpiG9qgUhGmgJjNXcX6T/vd3fXD1T/ARqA75A/qJiCP1UIqfAfOEeO8pEZm5EPQgKbnRnv5WIVeNOGamkwPAuwk2SiQDVphrgm+2xu152DR4VJsKUyixZdAEcqppPNxVYkU/R3iNr7zqA+44sNsF+bavfLtcmUnZwoTFHDwH3JG4OW1SCicdojPgX2ioo6r82JuG+UObt0ZrhWLHIK/4I+Bh6Dh7bJw3s2feRz62G10VTYz3Aw2EHEkJVOjnRSWzj0AGFXc4m1/AimJ/xbSlpfis9H0a46n/ASCJQjQm6K21wxrAeh+wHB+BxnqV7gumnOvFWeXRFZeMe3OQQJa41O2YvcMMl2i7rElk= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0d5d1345-428a-49ff-e32d-08d5dcff7703 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Jun 2018 14:00:12.0823 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR21MB0172 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Add initialization and discard functions to mem_pool type. As the memory allocated by mem_pool can now be freed, we also track the large allocations. If the there are existing mp_blocks in the mem_poo's linked list of mp_blocksl, then the mp_block for a large allocation is inserted behind the head block. This is because only the head mp_block is considered when searching for availble space. This results in the following desirable properties: 1) The mp_block allocated for the large request will not be included not included in the search for available in future requests, the large mp_block is sized for the specific request and does not contain any spare space. 2) The head mp_block will not bumped from considation for future memory requests just because a request for a large chunk of memory came in. These changes are in preparation for a future commit that will utilize creating and discarding memory pool. Signed-off-by: Jameson Miller --- mem-pool.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++-------- mem-pool.h | 10 +++++++++ 2 files changed, 61 insertions(+), 8 deletions(-) diff --git a/mem-pool.c b/mem-pool.c index c80124f1fe..1769400d2d 100644 --- a/mem-pool.c +++ b/mem-pool.c @@ -5,20 +5,65 @@ #include "cache.h" #include "mem-pool.h" =20 -static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool, si= ze_t block_alloc) +#define BLOCK_GROWTH_SIZE 1024*1024 - sizeof(struct mp_block); + +/* + * Allocate a new mp_block and insert it after the block specified in + * `insert_after`. If `insert_after` is NULL, then insert block at the + * head of the linked list. + */ +static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool, si= ze_t block_alloc, struct mp_block *insert_after) { struct mp_block *p; =20 mem_pool->pool_alloc +=3D sizeof(struct mp_block) + block_alloc; p =3D xmalloc(st_add(sizeof(struct mp_block), block_alloc)); - p->next_block =3D mem_pool->mp_block; + p->next_free =3D (char *)p->space; p->end =3D p->next_free + block_alloc; - mem_pool->mp_block =3D p; + + if (insert_after) { + p->next_block =3D insert_after->next_block; + insert_after->next_block =3D p; + } else { + p->next_block =3D mem_pool->mp_block; + mem_pool->mp_block =3D p; + } =20 return p; } =20 +void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size) +{ + struct mem_pool *pool; + + if (*mem_pool) + return; + + pool =3D xcalloc(1, sizeof(*pool)); + + pool->block_alloc =3D BLOCK_GROWTH_SIZE; + + if (initial_size > 0) + mem_pool_alloc_block(pool, initial_size, NULL); + + *mem_pool =3D pool; +} + +void mem_pool_discard(struct mem_pool *mem_pool) +{ + struct mp_block *block, *block_to_free; + + while ((block =3D mem_pool->mp_block)) + { + block_to_free =3D block; + block =3D block->next_block; + free(block_to_free); + } + + free(mem_pool); +} + void *mem_pool_alloc(struct mem_pool *mem_pool, size_t len) { struct mp_block *p =3D NULL; @@ -33,12 +78,10 @@ void *mem_pool_alloc(struct mem_pool *mem_pool, size_t = len) p =3D mem_pool->mp_block; =20 if (!p) { - if (len >=3D (mem_pool->block_alloc / 2)) { - mem_pool->pool_alloc +=3D len; - return xmalloc(len); - } + if (len >=3D (mem_pool->block_alloc / 2)) + return mem_pool_alloc_block(mem_pool, len, mem_pool->mp_block); =20 - p =3D mem_pool_alloc_block(mem_pool, mem_pool->block_alloc); + p =3D mem_pool_alloc_block(mem_pool, mem_pool->block_alloc, NULL); } =20 r =3D p->next_free; diff --git a/mem-pool.h b/mem-pool.h index 829ad58ecf..f75b3365d5 100644 --- a/mem-pool.h +++ b/mem-pool.h @@ -21,6 +21,16 @@ struct mem_pool { size_t pool_alloc; }; =20 +/* + * Initialize mem_pool with specified initial size. + */ +void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size); + +/* + * Discard a memory pool and free all the memory it is responsible for. + */ +void mem_pool_discard(struct mem_pool *mem_pool); + /* * Alloc memory from the mem_pool. */ --=20 2.17.1