forked from luck/tmp_suning_uos_patched
target: Don't zero pages used for data buffers
Doing alloc_page(GFP_KERNEL | __GFP_ZERO) to get pages used for data buffers wastes a lot of CPU clearing pages that will be quickly be overwritten by the actual data. However, for emulated control commands such as INQUIRY and so on, the code does assume that the buffer is zeroed. To avoid this CPU overhead, skip the __GFP_ZERO for commands that are actually moving data, ie cmds that have SCF_SCSI_DATA_SG_IO_CDB set. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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6816966a84
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9db9da3322
@ -3516,6 +3516,7 @@ transport_generic_get_mem(struct se_cmd *cmd)
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u32 length = cmd->data_length;
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unsigned int nents;
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struct page *page;
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gfp_t zero_flag;
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int i = 0;
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nents = DIV_ROUND_UP(length, PAGE_SIZE);
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@ -3526,9 +3527,11 @@ transport_generic_get_mem(struct se_cmd *cmd)
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cmd->t_data_nents = nents;
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sg_init_table(cmd->t_data_sg, nents);
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zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
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while (length) {
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u32 page_len = min_t(u32, length, PAGE_SIZE);
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page = alloc_page(GFP_KERNEL | __GFP_ZERO);
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page = alloc_page(GFP_KERNEL | zero_flag);
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if (!page)
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goto out;
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