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6otD/cJAac3A46G+uSzVzcl1v6OaRGskF03B4pKYOlrk1kyQDpEj8Cj5 3aEB5qDLrdoLblq9S5oAN4iM3laNJCoz5YFriWRsydRP56yRRA+++wkLapaddyCL2yBD3riBrr5 TE4GLzk25+fp/WoSdabpGA2fNCPFocc8G9KynN+PBLypRtAo4yARryDXHx6oXD5cyUgWQb9Xzfq AOKCG9XW9FTyMy4SbRrkzj7SceGwx60dIDQP3z8SxYq3WqsPihfK4IN302ya8ed11F9IsKFB+YX 3vwyMBBDpeE76EMrX8tSxQKh7Jq1z4Mxg/VjhfPngIgpj8eDcC063Wh9WVqgmWCfbzydb0g2EuZ q9zngaeNo+PRbWqfRK6NVEWSRWybNGGMuDYaJML1pQSQOYJpn1mWggYOc8Su4vYBTws4cdrzvau lkh5DXOpSNJaGQzdr5oADS46RG/plO5UpiuW4TqhSh95NwPO4hXICXPkDTMLvGyaLyWJvBWLqcd F40kDywzhVZiqhieGz597RaJ+lCg== X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--7.396400-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.6.1012-25518.003 X-MDID: 1593768217-W42FarqarVf4 Subject: Re: [dpdk-dev] [PATCH] mempool: return ENOMEM if initial alloc size can not be satisfied 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 7/3/20 11:41 AM, Zhike Wang wrote: > Signed-off-by: Zhike Wang > --- > lib/librte_mempool/rte_mempool.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c > index 0bde995..b24feb6 100644 > --- a/lib/librte_mempool/rte_mempool.c > +++ b/lib/librte_mempool/rte_mempool.c > @@ -622,6 +622,12 @@ struct pagesz_walk_arg { > goto fail; > } > > + if (max_alloc_size < min_chunk_size) { > + rte_errno = ENOMEM; > + ret = -rte_errno; > + goto fail; > + } > + > /* if we're trying to reserve contiguous memory, add appropriate > * memzone flag. > */ > As far as I can see there is really a bug in nearby code, but the fix suggested here is a wrong direction. The check is already present below in do-while loop condition, but it is wrong that max_alloc_size is divided by 2 in the case of successful allocation as well. 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). However, 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. mem_size will be recalculated, but max_alloc_size will limit allocation attempt size. So, I think it is required to add "mz != NULL ||" to the if condition in do-while loop. It will guarantee that max_alloc_size is reduced if and only if mz == NULL and if it becomes smaller than min_chunk_size, if condition after do-while loop will return error.