Since we have kdump kernel(s) running under severe memory constraint it makes sense to disable the qed SRIOV functionality when running the kdump kernel as kdump configurations on several distributions don't support SRIOV targets for saving the vmcore (see [1] for example). Currently the qed SRIOV functionality ends up consuming memory in the kdump kernel, when we don't really use the same. An example log seen in the kdump kernel with the SRIOV functionality enabled can be seen below (obtained via memstrack tool, see [2]): dracut-pre-pivot[676]: ======== Report format module_summary: ======== dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages) This patch disables the SRIOV functionality inside kdump kernel and with the same applied the memory consumption goes down: dracut-pre-pivot[671]: ======== Report format module_summary: ======== dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak allocation 124.7MB (1995 pages) [1]. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/installing-and-configuring-kdump_managing-monitoring-and-updating-the-kernel#supported-kdump-targets_supported-kdump-configurations-and-targets [2]. Memstrack tool: https://github.com/ryncsn/memstrack Cc: kexec@xxxxxxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: Ariel Elior <aelior@xxxxxxxxxxx> Cc: GR-everest-linux-l2@xxxxxxxxxxx Cc: Manish Chopra <manishc@xxxxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Bhupesh Sharma <bhsharma@xxxxxxxxxx> --- drivers/net/ethernet/qlogic/qed/qed_sriov.h | 10 +++++++--- drivers/net/ethernet/qlogic/qede/qede_main.c | 2 +- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.h b/drivers/net/ethernet/qlogic/qed/qed_sriov.h index 368e88565783..aabeaf03135e 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_sriov.h +++ b/drivers/net/ethernet/qlogic/qed/qed_sriov.h @@ -32,6 +32,7 @@ #ifndef _QED_SRIOV_H #define _QED_SRIOV_H +#include <linux/crash_dump.h> #include <linux/types.h> #include "qed_vf.h" @@ -40,9 +41,12 @@ #define QED_VF_ARRAY_LENGTH (3) #ifdef CONFIG_QED_SRIOV -#define IS_VF(cdev) ((cdev)->b_is_vf) -#define IS_PF(cdev) (!((cdev)->b_is_vf)) -#define IS_PF_SRIOV(p_hwfn) (!!((p_hwfn)->cdev->p_iov_info)) +#define IS_VF(cdev) (is_kdump_kernel() ? \ + (0) : ((cdev)->b_is_vf)) +#define IS_PF(cdev) (is_kdump_kernel() ? \ + (1) : !((cdev)->b_is_vf)) +#define IS_PF_SRIOV(p_hwfn) (is_kdump_kernel() ? \ + (0) : !!((p_hwfn)->cdev->p_iov_info)) #else #define IS_VF(cdev) (0) #define IS_PF(cdev) (1) diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c index 1a83d1fd8ccd..28afa0c49fe8 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_main.c +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c @@ -1194,7 +1194,7 @@ static int qede_probe(struct pci_dev *pdev, const struct pci_device_id *id) case QEDE_PRIVATE_VF: if (debug & QED_LOG_VERBOSE_MASK) dev_err(&pdev->dev, "Probing a VF\n"); - is_vf = true; + is_vf = is_kdump_kernel() ? false : true; break; default: if (debug & QED_LOG_VERBOSE_MASK) -- 2.7.4 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
