Re: [Crash-utility] [External Mail]Re: zram decompress support for gcore/crash-utility

Hi,Dave Zram is a virtual device,it simulated as a block device,it's part of memroy/ramdump,just enable CONFIG_ZRAM,no other settings needed. you can refer to drivers/block/zram/zram_drv.c driver calling zram_meta_alloc to alloc memory from RAM. We want to be able to access these zram page like a normal page. ________________________________________ From: Dave Anderson <anderson(a)redhat.com&gt; Sent: Wednesday, April 1, 2020 23:24 To: 赵乾利 Cc: d hatayama; Discussion list for crash utility usage, maintenance and development Subject: Re: [External Mail]Re: [Crash-utility] zram decompress support for gcore/crash-utility ----- Original Message ----- Ok, so with respect to user-space virtual addresses, there is nothing other than handling zram swap-backed memory. So what you're proposing is that when reading user-space memory that happens to be backed-up on a zram swap device, then the user data could alternatively be read from the zram swap device, and presented as if it were present in physical memory? Are the physical RAM pages that make up the contents of a zram device collected with a typical filtered compressed kdump? If not, what makedumpfile -d flag is required for them to be captured? Dave #/******本邮件及其附件含有小米公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ This e-mail and its attachments contain confidential information from XIAOMI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!******/#