Scan fragmentation in memory devices
A memory system includes a memory device and a processing device, operatively coupled to the memory device. The processing device performs operations comprising: identifying one or more mandatory scan wordlines of the memory device and one or more remaining wordlines of the memory device; performing a plurality of scan iterations with respect to a plurality of pages of the memory device, such that performing each scan iteration comprises: identifying, among the remaining wordlines, one or more scheduled scan wordlines of the memory device, scanning a subset of pages of the memory device that are addressable by the mandatory scan wordlines and the scheduled scan wordlines; wherein a combination of a first plurality of pages addressable by the scheduled scan wordlines selected by the plurality of scan iterations and a second plurality of pages addressable by the mandatory wordlines comprises the plurality of pages of the memory device.
1 . A system comprising:
a memory device; and
a processing device, operatively coupled to the memory device, to perform operations comprising:
identifying one or more mandatory scan wordlines of the memory device and one or more remaining wordlines of the memory device;
identifying, by applying a predefined functional transformation to identifiers of the remaining wordlines, one or more scheduled scan wordlines of the memory device; and
scanning a subset of pages of the memory device that are addressable by the mandatory scan wordlines and the scheduled scan wordlines.
2 . The system of claim 1 , wherein scanning the subset of pages of the memory device further comprises:
evaluating, with respect to a specified page of the subset of pages, a data state metric;
responsive to determining that the data state metric fails to satisfy a quality criterion, performing a media management operation with respect to a block comprising the specified page.
3 . The system of claim 2 , wherein performing the media management operation comprises relocating, to another block, data stored by the block comprising the specified page.
4 . The system of claim 2 , wherein the data state metric reflects a bit error rate of the specified page.
5 . The system of claim 1 , wherein identifying the one or more mandatory scan wordlines further comprises:
reading system metadata associated with the memory device.
6 . The system of claim 1 , wherein identifying the one or more mandatory scan wordlines further comprises:
identifying, among a plurality of wordlines of the memory device, one or more wordlines that are triggering more error handling operations that the remaining wordlines of the memory device.
7 . The system of claim 1 , wherein identifying the one or more scheduled scan wordlines further comprises:
incrementing, by a predefined value, each of identifiers of the scheduled scan wordlines processed by a previous scan iteration.
8 . The system of claim 1 , wherein identifying the one or more scheduled scan wordlines further comprises:
randomly selecting a predefined number of wordlines among the remaining wordlines of the memory device.
9 . A method, comprising:
identifying, by a processing device, one or more mandatory scan wordlines of the memory device and one or more remaining wordlines of a memory device;
identifying, by applying a predefined functional transformation to identifiers of the remaining wordlines, one or more scheduled scan wordlines of the memory device; and
scanning a subset of pages of the memory device that are addressable by the mandatory scan wordlines and the scheduled scan wordlines.
10 . The method of claim 9 , wherein scanning the subset of pages of the memory device further comprises:
evaluating, with respect to a specified page of the subset of pages, a data state metric;
responsive to determining that the data state metric fails to satisfy a quality criterion, performing a media management operation with respect to a block comprising the specified page.
11 . The method of claim 10 , wherein performing the media management operation comprises relocating, to another block, data stored by the block comprising the specified page.
12 . The method of claim 10 , wherein the data state metric reflects a bit error rate of the specified page.
13 . The method of claim 9 , wherein identifying the one or more mandatory scan wordlines further comprises:
reading system metadata associated with the memory device.
14 . The method of claim 9 , wherein identifying the one or more mandatory scan wordlines further comprises:
identifying, among a plurality of wordlines of the memory device, one or more wordlines that are triggering more error handling operations that the remaining wordlines of the memory device.
15 . The method of claim 9 , wherein identifying the one or more scheduled scan wordlines further comprises:
incrementing, by a predefined value, each of identifiers of the scheduled scan wordlines processed by a previous scan iteration.
16 . The method of claim 9 , wherein identifying the one or more scheduled scan wordlines further comprises:
randomly selecting a predefined number of wordlines among the remaining wordlines of the memory device.
17 . A non-transitory computer-readable storage medium comprising executable instructions that, when executed by a processing device, cause the processing device to perform operations comprising:
identifying one or more mandatory scan wordlines of a memory device and one or more remaining wordlines of the memory device;
identifying, by applying a predefined functional transformation to identifiers of the remaining wordlines, one or more scheduled scan wordlines of the memory device; and
scanning a subset of pages of the memory device that are addressable by the mandatory scan wordlines and the scheduled scan wordlines.
18 . The non-transitory computer-readable storage medium of claim 17 , wherein scanning the subset of pages of the memory device further comprises:
evaluating, with respect to a specified page of the subset of pages, a data state metric;
responsive to determining that the data state metric fails to satisfy a quality criterion, performing a media management operation with respect to a block comprising the specified page.
19 . The non-transitory computer-readable storage medium of claim 17 , wherein identifying the one or more mandatory scan wordlines further comprises:
reading system metadata associated with the memory device.
20 . The non-transitory computer-readable storage medium of claim 17 , wherein identifying the one or more mandatory scan wordlines further comprises:
identifying, among a plurality of wordlines of the memory device, one or more wordlines that are triggering more error handling operations that the remaining wordlines of the memory device.