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QW5G6BKkLTpEgaBf5eVRwvZvT2zYoYOwC/ExpXrHizwjRiu1AuxJTHW7 HSPhvJoSBpNSULRNtYDjvmhyIdCdxY1MKXhkMOrsLFirdaqw+KF8rgg3fTbJrx53XUX0iwoUoQY qGb1tpo1H9VOzAUPvzZ3e7V9WZ4GXj0cC4fy8dEDHmyDJSEsI2wKflB9+9kWVi7p9NckzZOvORP furwfzV/rq32+Xiq2B5MDkzrY46TssaaYlMvaOHAPZZctd3P4B2V3WtIRNH0u8NrbzjPvzJyoRu c8P32Ms4vM1YF6AJbZFi+KwZZttL7ew1twePJJB3QfwsVk0UbsIoUKaF27lxaZfN89aFIGY6STp SQhIu4B1x10W0z4fFeNHHH6f+SySMV2Io7KVotz8AjqUK9Usa674b3C5+SutNjHFxPjxXnXYaxn bwbaORKKAQfLsnhLrKWSt4DmvbhpicKLmK2TeKmsPn5C6nWpTnqg/VrSZEiM= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--7.276400-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25538.003 X-MDID: 1594636338-FKvy2ijHPp_g Subject: Re: [dpdk-dev] [PATCH] mempool: fix memory allocation in memzones during retry. X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/13/20 6:40 AM, Zhike Wang wrote: > If allocation is successful on the first attempt, typically > there is no problem since we allocated everything required and > we'll terminate the loop (if memory chunk is really sufficient > to populate required number of mempool elements). > > If the first attempt fails, we try to allocate half > of mem_size and it succeed, we'll have one more iteration of > the for-loop to allocate memory for remaining elements and > should not try the next time with quarter of the mem_size. > > It is wrong that max_alloc_size is divided by 2 in the > case of successful allocation as well, or invalid memory > can be allocated, and leads to population failure, then errno > other than ENOMEM may be returned. > > Signed-off-by: Andrew Rybchenko > Signed-off-by: Zhike Wang Reviewed-by: Andrew Rybchenko > --- > lib/librte_mempool/rte_mempool.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c > index a2bd249..b8f2629 100644 > --- a/lib/librte_mempool/rte_mempool.c > +++ b/lib/librte_mempool/rte_mempool.c > @@ -635,7 +635,7 @@ struct pagesz_walk_arg { > RTE_MIN((size_t)mem_size, max_alloc_size), > mp->socket_id, mz_flags, align); > > - if (mz == NULL && rte_errno != ENOMEM) > + if ((mz != NULL) || (mz == NULL && rte_errno != ENOMEM)) > break; > > max_alloc_size = RTE_MIN(max_alloc_size, >